Generic configury support for shared libs on VxWorks

This change adds the configury bits to activate the build of
shared libs on VxWorks ports configured with --enable-shared,
for libraries variants where this is generally supported (rtp,
code model !large - currently not compatible with -fPIC).

Set lt_cv_deplibs_check_method in libtool.m4, so the build of
libraries know how to establish dependencies.  This is useful in
configurations such as aarch64 where proper support of LSE relies
on accurate dependency information between libstdc++ and libgcc_s
to begin with.

Regenerate configure scripts to reflect libtool.m4 change.

2022-10-09  Olivier Hainque  <hainque@adacore.com>

	* libtool.m4 (*vxworks*): When enable_shared, set dynamic_linker
	and friends for rtp !large. Assume the linker has the required
	abilities and set lt_cv_deplibs_check_method.

gcc/
	* config.gcc (*vxworks*): Add t-slibgcc fragment
	if enable_shared.

libgcc/
	* config.host (*vxworks*): When enable_shared, add
	libgcc and crtstuff "shared" fragments for rtp except
	large code model.
	(aarch64*-wrs-vxworks7*): Remove t-slibgcc-libgcc from
	the list of fragments.

2022-10-09  Olivier Hainque  <hainque@adacore.com>

gcc/
	* configure: Regenerate.

libatomic/
	* configure: Regenerate.

libbacktrace/
	* configure: Regenerate.

libcc1/
	* configure: Regenerate.

libffi/
	* configure: Regenerate.

libgfortran/
	* configure: Regenerate.

libgomp/
	* configure: Regenerate.

libitm/
	* configure: Regenerate.

libobjc/
	* configure: Regenerate.

liboffloadmic/
	* configure: Regenerate.

liboffloadmic/
	* plugin/configure: Regenerate.

libphobos/
	* configure: Regenerate.

libquadmath/
	* configure: Regenerate.

libsanitizer/
	* configure: Regenerate.

libssp/
	* configure: Regenerate.

libstdc++-v3/
	* configure: Regenerate.

libvtv/
	* configure: Regenerate.

lto-plugin/
	* configure: Regenerate.

zlib/
	* configure: Regenerate.

22 files changed, 758 insertions, 21 deletions

diff --git a/gcc/config.gcc b/gcc/config.gcc
index eec544ff1ba..8d5972fecf7 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -5518,6 +5518,15 @@ case "${target}" in
 		;;
 esac
 
+# VxWorks support for shared libraries has to be requested explicitly,
+# so we can factor this part here:
+
+case "${target}-${enable_shared}" in
+  *-*-vxworks*-yes)
+    tmake_file="${tmake_file} t-slibgcc"
+    ;;
+esac
+
 # Targets for which there is at least one VxWorks port should include
 # vxworks-dummy.h to allow safe references to various TARGET_VXWORKS kinds
 # of markers from other files in the port, including the vxworks*.h files to
diff --git a/gcc/configure b/gcc/configure
index b512580414a..db366817cd0 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -14737,6 +14737,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -19248,6 +19253,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -21354,8 +21378,9 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        ld_shlibs_CXX=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        ld_shlibs_CXX=yes
         ;;
 
       *)
@@ -22903,6 +22928,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libatomic/configure b/libatomic/configure
index 92853dd8a45..69e6b823ce5 100755
--- a/libatomic/configure
+++ b/libatomic/configure
@@ -6161,6 +6161,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -10941,6 +10946,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libbacktrace/configure b/libbacktrace/configure
index 705b71bd8cd..4e0987258e8 100755
--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@@ -6558,6 +6558,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -11070,6 +11075,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libcc1/configure b/libcc1/configure
index 6dd91a086e6..2801e6c2ad0 100755
--- a/libcc1/configure
+++ b/libcc1/configure
@@ -5825,6 +5825,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -10336,6 +10341,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -12848,8 +12872,9 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        ld_shlibs_CXX=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        ld_shlibs_CXX=yes
         ;;
 
       *)
@@ -14397,6 +14422,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libffi/configure b/libffi/configure
index 575641cca1d..523fa66c83e 100755
--- a/libffi/configure
+++ b/libffi/configure
@@ -6351,6 +6351,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -11131,6 +11136,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -13237,8 +13261,9 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        ld_shlibs_CXX=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        ld_shlibs_CXX=yes
         ;;
 
       *)
@@ -14786,6 +14811,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libgcc/config.host b/libgcc/config.host
index 9dcc2538dc8..0fbf9a34f17 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -410,7 +410,7 @@ aarch64*-*-vxworks7*)
 	extra_parts="$extra_parts crtfastmath.o"
 	md_unwind_header=aarch64/aarch64-unwind.h
 	tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
-	tmake_file="${tmake_file} ${cpu_type}/t-lse t-slibgcc-libgcc"
+	tmake_file="${tmake_file} ${cpu_type}/t-lse"
 	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
 	tmake_file="${tmake_file} t-dfprules"
 	;;
@@ -1549,6 +1549,35 @@ aarch64*-*-*)
 	;;
 esac
 
+# Setup to build a shared libgcc for VxWorks when that was requested,
+# for library variants that support it (rtp only, code model not large).
+#
+
+case ${host} in
+*vxworks*)
+	case ${with_multisubdir}-${enable_shared} in
+	*large*)
+		;;
+	*mrtp*-yes)
+		tmake_file="${tmake_file} t-libgcc-pic"
+
+		# Arrange to set a soname on libgcc_s so DT_NEEDED entries
+		# for it refer to that alone. This ensures absence of path
+		# components which would be incorrect as the runtime loader
+		# on target has no visibility over the host filesystem.
+		tmake_file="${tmake_file} t-slibgcc-gld-nover"
+		tmake_file="${tmake_file} t-slibgcc"
+
+		# t-slibgcc-libgcc is needed on at least aarch64 (for
+		# lse) and at most harmless on other targets.
+		tmake_file="${tmake_file} t-slibgcc-libgcc"
+
+		tmake_file="${tmake_file} t-crtstuff-pic t-vxcrtstuffS"
+		;;
+	esac
+	;;
+esac
+
 # The vxworks threads implementation relies on a few extra sources,
 # which we arrange to add after everything else:
 
diff --git a/libgfortran/configure b/libgfortran/configure
index beb0ec49eb1..bac967fc228 100755
--- a/libgfortran/configure
+++ b/libgfortran/configure
@@ -7783,6 +7783,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -12311,6 +12316,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -16075,6 +16099,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libgomp/configure b/libgomp/configure
index b11170e6a7c..c4d54f0a834 100755
--- a/libgomp/configure
+++ b/libgomp/configure
@@ -6173,6 +6173,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -10953,6 +10958,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -14587,6 +14611,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libitm/configure b/libitm/configure
index 18fc2d3a10a..3700ae44de2 100755
--- a/libitm/configure
+++ b/libitm/configure
@@ -6836,6 +6836,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -11617,6 +11622,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -13723,8 +13747,9 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        ld_shlibs_CXX=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        ld_shlibs_CXX=yes
         ;;
 
       *)
@@ -15272,6 +15297,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libobjc/configure b/libobjc/configure
index 2dcc9cd32f6..ee7e021f949 100755
--- a/libobjc/configure
+++ b/libobjc/configure
@@ -5478,6 +5478,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -10315,6 +10320,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/liboffloadmic/configure b/liboffloadmic/configure
index f8da8fabb6f..24b687a05fa 100755
--- a/liboffloadmic/configure
+++ b/liboffloadmic/configure
@@ -6470,6 +6470,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -10981,6 +10986,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -13087,8 +13111,9 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        ld_shlibs_CXX=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        ld_shlibs_CXX=yes
         ;;
 
       *)
@@ -14636,6 +14661,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/liboffloadmic/plugin/configure b/liboffloadmic/plugin/configure
index ce0a5511fc3..6e2b88c350d 100755
--- a/liboffloadmic/plugin/configure
+++ b/liboffloadmic/plugin/configure
@@ -5849,6 +5849,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -10628,6 +10633,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -12734,8 +12758,9 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        ld_shlibs_CXX=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        ld_shlibs_CXX=yes
         ;;
 
       *)
@@ -14283,6 +14308,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libphobos/configure b/libphobos/configure
index 69d2d440d69..f1540b24f2d 100755
--- a/libphobos/configure
+++ b/libphobos/configure
@@ -6798,6 +6798,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -11309,6 +11314,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libquadmath/configure b/libquadmath/configure
index 603f2f13140..39579d14cdf 100755
--- a/libquadmath/configure
+++ b/libquadmath/configure
@@ -5820,6 +5820,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -10350,6 +10355,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libsanitizer/configure b/libsanitizer/configure
index 771b135573a..9552cc0d06f 100755
--- a/libsanitizer/configure
+++ b/libsanitizer/configure
@@ -7407,6 +7407,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -11918,6 +11923,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -14024,8 +14048,9 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        ld_shlibs_CXX=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        ld_shlibs_CXX=yes
         ;;
 
       *)
@@ -15573,6 +15598,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libssp/configure b/libssp/configure
index b27ae22a976..ff0d9c3b61d 100755
--- a/libssp/configure
+++ b/libssp/configure
@@ -6006,6 +6006,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -10536,6 +10541,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 7ead77a5c80..4bb1d73f0e0 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -7089,6 +7089,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -11747,6 +11752,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -13874,8 +13898,9 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        ld_shlibs_CXX=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        ld_shlibs_CXX=yes
         ;;
 
       *)
@@ -15426,6 +15451,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/libtool.m4 b/libtool.m4
index 17f8e5f3074..b92e284d9f9 100644
--- a/libtool.m4
+++ b/libtool.m4
@@ -2675,6 +2675,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -3162,6 +3181,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 ])
 file_magic_cmd=$lt_cv_file_magic_cmd
@@ -6396,8 +6420,9 @@ if test "$_lt_caught_CXX_error" != yes; then
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        _LT_TAGVAR(ld_shlibs, $1)=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        _LT_TAGVAR(ld_shlibs, $1)=yes
         ;;
 
       *)
diff --git a/libvtv/configure b/libvtv/configure
index 897b069b613..a2cfca98332 100755
--- a/libvtv/configure
+++ b/libvtv/configure
@@ -7302,6 +7302,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -11813,6 +11818,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
@@ -13919,8 +13943,9 @@ if test -z "$aix_libpath"; then aix_libpath="/usr/lib:/lib"; fi
         ;;
 
       vxworks*)
-        # FIXME: insert proper C++ library support
-        ld_shlibs_CXX=no
+        # For VxWorks ports, we assume the use of a GNU linker with
+        # standard elf conventions.
+        ld_shlibs_CXX=yes
         ;;
 
       *)
@@ -15468,6 +15493,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/lto-plugin/configure b/lto-plugin/configure
index f165eaeb194..33a07c819a4 100755
--- a/lto-plugin/configure
+++ b/lto-plugin/configure
@@ -7157,6 +7157,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -11669,6 +11674,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;
diff --git a/zlib/configure b/zlib/configure
index 05c41b7e12d..a05f1c647fd 100755
--- a/zlib/configure
+++ b/zlib/configure
@@ -5482,6 +5482,11 @@ sysv4 | sysv4.3*)
 tpf*)
   lt_cv_deplibs_check_method=pass_all
   ;;
+vxworks*)
+  # Assume VxWorks cross toolchains are built on Linux, possibly
+  # as canadian for Windows hosts.
+  lt_cv_deplibs_check_method=pass_all
+  ;;
 esac
 
 fi
@@ -10279,6 +10284,25 @@ uts4*)
   shlibpath_var=LD_LIBRARY_PATH
   ;;
 
+# Shared libraries for VwWorks, >= 7 only at this stage
+# and (fpic) still incompatible with "large" code models
+# in a few configurations. Only for RTP mode in any case,
+# and upon explicit request at configure time.
+vxworks7*)
+  dynamic_linker=no
+  case ${with_multisubdir}-${enable_shared} in
+    *large*)
+      ;;
+    *mrtp*-yes)
+      version_type=linux
+      need_lib_prefix=no
+      need_version=no
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major $libname${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      dynamic_linker="$host_os module_loader"
+      ;;
+  esac
+  ;;
 *)
   dynamic_linker=no
   ;;