Add STB_SECONDARY support to ld.sohjl/secondary/2.21

Enable STB_SECONDARY if it is supported by binutils.  Add 3 STB_SECONDARY
tests.

	* config.h.in: Add HAVE_ASM_SECONDARY_DIRECTIVE.
	* config.make.in (have-secondary): New macro.
	* configure.in: Check if STB_SECONDARY is supported by as/ld.
	Define HAVE_ASM_SECONDARY_DIRECTIVE and set have-secondary to yes
	if the .secondary assembly directive works.
	* configure: Regenerated.
	* elf/Makefile (tests): Add tst-secondary1 tst-secondary2
	tst-secondary3 if STB_SECONDARY is supported by as/ld.
	(modules-names): Add tst-secondarymod tst-secondary1mod
	tst-secondary2mod tst-secondary3mod if STB_SECONDARY is supported
	by as/ld.
	(LDFLAGS-tst-secondarymod.so): New macro.
	($(objpfx)tst-secondary1): New rule.
	($(objpfx)tst-secondary2): Likewise.
	($(objpfx)tst-secondary3): Likewise.
	* elf/dl-addr.c (determine_info): Also check STB_SECONDARY.
	* elf/dl-lookup.c (do_lookup_x): Handle STB_SECONDARY.
	(_dl_lookup_symbol_x): Likewise.
	* elf/sprof.c (read_symbols): Likewise.
	* elf/elf.h (STB_SECONDARY): New.
	(STB_NUM): Updated.
	* elf/tst-secondary.h: New file.
	* elf/tst-secondary1.c: Likewise.
	* elf/tst-secondary1mod.c: Likewise.
	* elf/tst-secondary2.c: Likewise.
	* elf/tst-secondary2mod.c: Likewise.
	* elf/tst-secondary3.c: Likewise.
	* elf/tst-secondary3mod.c: Likewise.
	* elf/tst-secondarymod.c: Likewise.

1 files changed, 69 insertions, 0 deletions

diff --git a/configure b/configure
index ce0c6a01f1..6af5bb77dd 100755
--- a/configure
+++ b/configure
@@ -623,6 +623,7 @@ libc_cv_cc_loop_to_function
 libc_cv_cc_submachine
 libc_cv_cc_nofma
 exceptions
+libc_cv_ld_secondary
 gnu89_inline
 libc_cv_ssp
 fno_unit_at_a_time
@@ -6333,8 +6334,10 @@ if { ac_try='${CC-cc} $ASFLAGS -c conftest.s 1>&5'
   $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; }; then
   libc_cv_asm_weak_directive=yes
+  libc_cv_asm_weak=.weak
 else
   libc_cv_asm_weak_directive=no
+  libc_cv_asm_weak=
 fi
 rm -f conftest*
 fi
@@ -6363,6 +6366,7 @@ EOF
   $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
   test $ac_status = 0; }; }; then
     libc_cv_asm_weakext_directive=yes
+    libc_cv_asm_weak=.weakext
   else
     libc_cv_asm_weakext_directive=no
   fi
@@ -6381,6 +6385,71 @@ elif test $libc_cv_asm_weakext_directive = yes; then
 
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for .secondary assembler directive" >&5
+$as_echo_n "checking for .secondary assembler directive... " >&6; }
+if ${libc_cv_asm_secondary_directive+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat > conftest.s <<EOF
+${libc_cv_dot_text}
+_sym:
+.secondary _sym
+EOF
+test -n "$libc_cv_asm_weak" && cat >> conftest.s <<EOF
+$libc_cv_asm_weak _sym
+EOF
+if ${CC-cc} -c $ASFLAGS -o conftest.o conftest.s 1>&5 2>&5; then
+  if $READELF -s conftest.o | fgrep _sym | fgrep SECOND > /dev/null; then
+    libc_cv_asm_secondary_directive=yes
+  else
+    libc_cv_asm_secondary_directive=no
+  fi
+else
+  libc_cv_asm_secondary_directive=no
+fi
+rm -f conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_secondary_directive" >&5
+$as_echo "$libc_cv_asm_secondary_directive" >&6; }
+if test $libc_cv_asm_secondary_directive = yes; then
+  $as_echo "#define HAVE_ASM_SECONDARY_DIRECTIVE 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for secondary symbol in shared library" >&5
+$as_echo_n "checking for secondary symbol in shared library... " >&6; }
+if ${libc_cv_ld_secondary+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat > conftest.c <<EOF
+asm (".secondary foo");
+void foo (void) { }
+EOF
+  if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+			    -fPIC -shared -o conftest.so conftest.c
+			    -nostartfiles -nostdlib
+			    1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+  then
+    if $READELF -s conftest.so | fgrep foo | fgrep SECOND > /dev/null; then
+      libc_cv_ld_secondary=yes
+    else
+      libc_cv_ld_secondary=no
+    fi
+  else
+    libc_cv_ld_secondary=no
+  fi
+  rm -f conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ld_secondary" >&5
+$as_echo "$libc_cv_ld_secondary" >&6; }
+else
+  libc_cv_ld_secondary=no
+fi
+
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ld --no-whole-archive" >&5
 $as_echo_n "checking for ld --no-whole-archive... " >&6; }
 if ${libc_cv_ld_no_whole_archive+:} false; then :