Configure USE_HIDDEN_LINKONCE on Solaris/x86

	gcc/testsuite:
	* gcc.target/i386/mcount_pic.c: Only xfail get_pc_thunk scan on
	Solaris 10.
	* gcc.target/i386/pr63620.c: Likewise.

	gcc:
	* config/i386/sol2.h (USE_HIDDEN_LINKONCE): Remove.
	* configure.ac (hidden_linkonce): New test.
	* configure: Regenerate.
	* config.in: Regenerate.

From-SVN: r257076

gcc/ChangeLog

+2018-01-26  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* config/i386/sol2.h (USE_HIDDEN_LINKONCE): Remove.
+	* configure.ac (hidden_linkonce): New test.
+	* configure: Regenerate.
+	* config.in: Regenerate.
+
 2018-01-26  Julia Koval  <julia.koval@intel.com>
 
 	* config/i386/avx512bitalgintrin.h (_mm512_bitshuffle_epi64_mask,

gcc/config.in

@@ -2207,6 +2207,12 @@
 #endif
 
 
+/* Define 0/1 if your linker supports hidden thunks in linkonce sections. */
+#ifndef USED_FOR_TARGET
+#undef USE_HIDDEN_LINKONCE
+#endif
+
+
 /* Define to 1 if the 'long long' type is wider than 'long' but still
    efficiently supported by the host hardware. */
 #ifndef USED_FOR_TARGET

gcc/config/i386/sol2.h

@@ -253,9 +253,3 @@ along with GCC; see the file COPYING3.  If not see
 /* We do not need NT_VERSION notes.  */
 #undef X86_FILE_START_VERSION_DIRECTIVE
 #define X86_FILE_START_VERSION_DIRECTIVE false
-
-/* Only recent versions of Solaris 11 ld properly support hidden .gnu.linkonce
-   sections, so don't use them.  */
-#ifndef USE_GLD
-#define USE_HIDDEN_LINKONCE 0
-#endif

gcc/configure

@@ -23798,6 +23798,35 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+# Restrict this test to Solaris/x86: other targets define this statically.
+case "${target}" in
+  i?86-*-solaris2* | x86_64-*-solaris2*)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking support for hidden thunks in linkonce sections" >&5
+$as_echo_n "checking support for hidden thunks in linkonce sections... " >&6; }
+    if test $in_tree_ld = yes || echo "$ld_ver" | grep GNU > /dev/null; then
+      hidden_linkonce=yes
+    else
+      case "${target}" in
+	# Full support for hidden thunks in linkonce sections only appeared in
+	# Solaris 11/OpenSolaris.
+        *-*-solaris2.1[1-9]*)
+	  hidden_linkonce=yes
+	  ;;
+	*)
+	  hidden_linkonce=no
+	  ;;
+      esac
+    fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $hidden_linkonce" >&5
+$as_echo "$hidden_linkonce" >&6; }
+
+cat >>confdefs.h <<_ACEOF
+#define USE_HIDDEN_LINKONCE `if test $hidden_linkonce = yes; then echo 1; else echo 0; fi`
+_ACEOF
+
+  ;;
+esac
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for line table discriminator support" >&5
 $as_echo_n "checking assembler for line table discriminator support... " >&6; }
 if test "${gcc_cv_as_discriminator+set}" = set; then :

gcc/configure.ac

@@ -3070,6 +3070,31 @@ AC_DEFINE_UNQUOTED(HAVE_COMDAT_GROUP,
     || test $gcc_cv_as_comdat_group_group = yes; then echo 1; else echo 0; fi`],
 [Define 0/1 if your assembler and linker support COMDAT groups.])
 
+# Restrict this test to Solaris/x86: other targets define this statically.
+case "${target}" in
+  i?86-*-solaris2* | x86_64-*-solaris2*)
+    AC_MSG_CHECKING(support for hidden thunks in linkonce sections)
+    if test $in_tree_ld = yes || echo "$ld_ver" | grep GNU > /dev/null; then
+      hidden_linkonce=yes
+    else
+      case "${target}" in
+	# Full support for hidden thunks in linkonce sections only appeared in
+	# Solaris 11/OpenSolaris.
+        *-*-solaris2.1[[1-9]]*)
+	  hidden_linkonce=yes
+	  ;;
+	*)
+	  hidden_linkonce=no
+	  ;;
+      esac
+    fi
+    AC_MSG_RESULT($hidden_linkonce)
+    AC_DEFINE_UNQUOTED(USE_HIDDEN_LINKONCE,
+      [`if test $hidden_linkonce = yes; then echo 1; else echo 0; fi`],
+    [Define 0/1 if your linker supports hidden thunks in linkonce sections.])
+  ;;
+esac
+
 gcc_GAS_CHECK_FEATURE([line table discriminator support],
  gcc_cv_as_discriminator,
  [2,19,51],,

gcc/testsuite/ChangeLog

+2018-01-26  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* gcc.target/i386/mcount_pic.c: Only xfail get_pc_thunk scan on
+	Solaris 10.
+	* gcc.target/i386/pr63620.c: Likewise.
+
 2018-01-26  Julia Koval  <julia.koval@intel.com>
 
 	* gcc.target/i386/avx512bitalg-vpshufbitqmb-1.c: Add -mavx512f -mavx512bw.

gcc/testsuite/gcc.target/i386/mcount_pic.c

@@ -11,5 +11,5 @@ int main ()
 }
 
 /* { dg-final { scan-assembler "mcount" } } */
-/* { dg-final { scan-assembler "get_pc_thunk" { xfail { *-*-solaris* && { ! gld } } } } } */
+/* { dg-final { scan-assembler "get_pc_thunk" { xfail { *-*-solaris2.10* && { ! gld } } } } } */
 /* { dg-final { cleanup-profile-file } } */

gcc/testsuite/gcc.target/i386/pr63620.c

@@ -17,4 +17,4 @@ test (__float128 x, int p, func f)
   return x;
 }
 
-/* { dg-final { scan-assembler "get_pc_thunk" { xfail { *-*-solaris* && { ! gld } } } } } */
+/* { dg-final { scan-assembler "get_pc_thunk" { xfail { *-*-solaris2.10* && { ! gld } } } } } */