Add support for debuginfod to the binutils (disable by default, enabled via a configure time option).

debuginfod is a lightweight web service that indexes ELF/DWARF
debugging resources by build-id and serves them over HTTP. This patch
enables objdump and readelf to query debuginfod servers when they are
otherwise not able to find separate debug files. Binutils can be built
with debuginfod using the --with-debuginfod configure option. This
requires that libdebuginfod be installed and found at configure time.
debuginfod is packaged with elfutils, starting with version 0.178. For
more information see https://sourceware.org/elfutils/.

toplevel* config/debuginfod.m4: New file. Add macro AC_DEBUGINFOD. Adds
        new configure option --with-debuginfod.
        * configure: Regenerate.
        * configure.ac: Call AC_DEBUGINFOD.

binutils* Makefile.am (readelf_LDADD, objdump_LDADD): Add libdebuginfod.
        * Makefile.in: Regenerate.
        * NEWS: Update.
        * config.in: Regenerate.
        * configure: Regenerate.
        * configure.ac: Call AC_DEBUGINFOD.
        * doc/Makefile.in: Regenerate.
        * doc/binutils.texi: Add section on using binutils
        with debuginfod.
        * dwarf.c (debuginfod_fetch_separate_debug_info): New function.
        Query debuginfod servers for the target debug file.
        (load_separate_debug_info): Call
        debuginfod_fetch_separate_debug_info if configured with
        debuginfod.
        (load_separate_debug_files): Add file argument to
        load_separate_debug_info calls.
        * dwarf.h (get_build_id): Add declaration.
        * objdump.c (get_build_id): New function. Get build-id of file.
        * readelf.c (get_build_id): Likewise.
        * testsuite/binutils-all/debuginfod.exp: New tests.
        * testsuite/binutils-all/linkdebug.s: Add .note.gnu.build-id
        section.

1 files changed, 137 insertions, 2 deletions

diff --git a/configure b/configure
index 6a9719f6091..e02123c36f4 100755
--- a/configure
+++ b/configure
@@ -690,6 +690,7 @@ extra_mpc_gmp_configure_flags
 extra_mpfr_configure_flags
 gmpinc
 gmplibs
+LIBDEBUGINFOD
 do_compare
 GNATMAKE
 GNATBIND
@@ -790,6 +791,7 @@ enable_libssp
 enable_libstdcxx
 enable_liboffloadmic
 enable_bootstrap
+with_debuginfod
 with_mpc
 with_mpc_include
 with_mpc_lib
@@ -1553,6 +1555,8 @@ Optional Packages:
   --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
   --with-build-libsubdir=DIR  Directory where to find libraries for build system
   --with-system-zlib      use installed libz
+  --with-debuginfod       Enable debuginfo lookups with debuginfod
+                          (auto/yes/no)
   --with-mpc=PATH         specify prefix directory for installed MPC package.
                           Equivalent to --with-mpc-include=PATH/include plus
                           --with-mpc-lib=PATH/lib
@@ -1921,6 +1925,52 @@ fi
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_try_link
+
+# ac_fn_c_check_decl LINENO SYMBOL VAR INCLUDES
+# ---------------------------------------------
+# Tests whether SYMBOL is declared in INCLUDES, setting cache variable VAR
+# accordingly.
+ac_fn_c_check_decl ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  as_decl_name=`echo $2|sed 's/ *(.*//'`
+  as_decl_use=`echo $2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $as_decl_name is declared" >&5
+$as_echo_n "checking whether $as_decl_name is declared... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+int
+main ()
+{
+#ifndef $as_decl_name
+#ifdef __cplusplus
+  (void) $as_decl_use;
+#else
+  (void) $as_decl_name;
+#endif
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$3=yes"
+else
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_decl
 cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
@@ -5433,6 +5483,92 @@ gmplibs="-lmpc -lmpfr -lgmp"
 gmpinc=
 have_gmp=no
 
+# Check for debuginfod
+
+
+# Enable debuginfod
+
+# Check whether --with-debuginfod was given.
+if test "${with_debuginfod+set}" = set; then :
+  withval=$with_debuginfod;
+else
+  with_debuginfod=auto
+fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to use debuginfod" >&5
+$as_echo_n "checking whether to use debuginfod... " >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_debuginfod" >&5
+$as_echo "$with_debuginfod" >&6; }
+
+if test "${with_debuginfod}" = no; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: debuginfod support disabled; some features may be unavailable." >&5
+$as_echo "$as_me: WARNING: debuginfod support disabled; some features may be unavailable." >&2;}
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for debuginfod_begin in -ldebuginfod" >&5
+$as_echo_n "checking for debuginfod_begin in -ldebuginfod... " >&6; }
+if ${ac_cv_lib_debuginfod_debuginfod_begin+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-ldebuginfod  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char debuginfod_begin ();
+int
+main ()
+{
+return debuginfod_begin ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_debuginfod_debuginfod_begin=yes
+else
+  ac_cv_lib_debuginfod_debuginfod_begin=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_debuginfod_debuginfod_begin" >&5
+$as_echo "$ac_cv_lib_debuginfod_debuginfod_begin" >&6; }
+if test "x$ac_cv_lib_debuginfod_debuginfod_begin" = xyes; then :
+  have_debuginfod_lib=yes
+fi
+
+  ac_fn_c_check_decl "$LINENO" "debuginfod_begin" "ac_cv_have_decl_debuginfod_begin" "#include <elfutils/debuginfod.h>
+"
+if test "x$ac_cv_have_decl_debuginfod_begin" = xyes; then :
+  have_debuginfod_h=yes
+fi
+
+  if test "x$have_debuginfod_lib" = "xyes" -a \
+          "x$have_debuginfod_h" = "xyes"; then
+
+$as_echo "#define HAVE_LIBDEBUGINFOD 1" >>confdefs.h
+
+    LIBDEBUGINFOD="-ldebuginfod"
+
+  else
+
+    if test "$with_debuginfod" = yes; then
+      as_fn_error $? "debuginfod is missing or unusable" "$LINENO" 5
+    else
+      { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: debuginfod is missing or unusable; some features may be unavailable." >&5
+$as_echo "$as_me: WARNING: debuginfod is missing or unusable; some features may be unavailable." >&2;}
+    fi
+  fi
+fi
+
+
 # Specify a location for mpc
 # check for this first so it ends up on the link line before mpfr.
 
@@ -5587,8 +5723,7 @@ if test -d ${srcdir}/gcc && test "x$have_gmp" = xno; then
   # Check for the recommended and required versions of GMP.
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for the correct version of gmp.h" >&5
 $as_echo_n "checking for the correct version of gmp.h... " >&6; }
-
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include "gmp.h"
 int