Darwin: Handle linker '-demangle' option.

Most of the Darwin linkers in use support this option which we will
now pass by default (matching the Xcode clang impl.)>

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

gcc/ChangeLog:

	* config.in: Regenerate.
	* config/darwin.h (DARWIN_LD_DEMANGLE): New.
	(LINK_COMMAND_SPEC_A): Add demangle handling.
	* configure: Regenerate.
	* configure.ac: Detect linker support for '-demangle'.

4 files changed, 48 insertions, 1 deletions

diff --git a/gcc/config.in b/gcc/config.in
index 0e62b9f..5cf51bc 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -2178,6 +2178,12 @@
 #endif
 
 
+/* Define to 1 if ld64 supports '-demangle'. */
+#ifndef USED_FOR_TARGET
+#undef LD64_HAS_DEMANGLE
+#endif
+
+
 /* Define to 1 if ld64 supports '-export_dynamic'. */
 #ifndef USED_FOR_TARGET
 #undef LD64_HAS_EXPORT_DYNAMIC
@@ -2239,7 +2245,8 @@
 #endif
 
 
-/* Define to the sub-directory where libtool stores uninstalled libraries. */
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
 #ifndef USED_FOR_TARGET
 #undef LT_OBJDIR
 #endif
diff --git a/gcc/config/darwin.h b/gcc/config/darwin.h
index 1b538c7..e0e8672 100644
--- a/gcc/config/darwin.h
+++ b/gcc/config/darwin.h
@@ -270,6 +270,12 @@ extern GTY(()) int darwin_ms_struct;
   "%<y*",								\
   "%<Mach "
 
+#if LD64_HAS_DEMANGLE
+#define DARWIN_LD_DEMANGLE " -demangle "
+#else
+#define DARWIN_LD_DEMANGLE ""
+#endif
+
 #if LD64_HAS_EXPORT_DYNAMIC
 #define DARWIN_RDYNAMIC "%{rdynamic:-export_dynamic}"
 #else
@@ -356,6 +362,7 @@ extern GTY(()) int darwin_ms_struct;
 #define LINK_COMMAND_SPEC_A \
    "%{!c:%{!E:%{!S:%{!M:%{!MM:%{!fsyntax-only:%{!fdump=*: \
     %(linker)" \
+    DARWIN_LD_DEMANGLE \
     LINK_PLUGIN_SPEC \
     "%{flto*:%<fcompare-debug*} \
      %{flto} %{fno-lto} %{flto=*} \
diff --git a/gcc/configure b/gcc/configure
index 496da71..c341ee1 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -30478,6 +30478,7 @@ if test x"$ld64_flag" = x"yes"; then
   # Set defaults for possibly untestable items.
   gcc_cv_ld64_export_dynamic=0
   gcc_cv_ld64_platform_version=0
+  gcc_cv_ld64_demangle=0
 
   if test "$build" = "$host"; then
     darwin_try_test=1
@@ -30501,6 +30502,9 @@ $as_echo_n "checking ld64 specified version... " >&6; }
     gcc_cv_ld64_major=`echo "$gcc_cv_ld64_version" | sed -e 's/\..*//'`
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_ld64_major" >&5
 $as_echo "$gcc_cv_ld64_major" >&6; }
+    if test "$gcc_cv_ld64_major" -ge 97; then
+      gcc_cv_ld64_demangle=1
+    fi
     if test "$gcc_cv_ld64_major" -ge 236; then
       gcc_cv_ld64_export_dynamic=1
     fi
@@ -30517,6 +30521,15 @@ $as_echo_n "checking linker version... " >&6; }
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_ld64_version" >&5
 $as_echo "$gcc_cv_ld64_version" >&6; }
 
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking linker for -demangle support" >&5
+$as_echo_n "checking linker for -demangle support... " >&6; }
+    gcc_cv_ld64_demangle=1
+    if $gcc_cv_ld -demangle < /dev/null 2>&1 | grep 'unknown option' > /dev/null; then
+      gcc_cv_ld64_demangle=0
+    fi
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_ld64_demangle" >&5
+$as_echo "$gcc_cv_ld64_demangle" >&6; }
+
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking linker for -export_dynamic support" >&5
 $as_echo_n "checking linker for -export_dynamic support... " >&6; }
     gcc_cv_ld64_export_dynamic=1
@@ -30546,6 +30559,12 @@ _ACEOF
 
 
 cat >>confdefs.h <<_ACEOF
+#define LD64_HAS_DEMANGLE $gcc_cv_ld64_demangle
+_ACEOF
+
+
+
+cat >>confdefs.h <<_ACEOF
 #define LD64_HAS_EXPORT_DYNAMIC $gcc_cv_ld64_export_dynamic
 _ACEOF
 
diff --git a/gcc/configure.ac b/gcc/configure.ac
index e91073b..46e58a2 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -6211,6 +6211,7 @@ if test x"$ld64_flag" = x"yes"; then
   # Set defaults for possibly untestable items.
   gcc_cv_ld64_export_dynamic=0
   gcc_cv_ld64_platform_version=0
+  gcc_cv_ld64_demangle=0
 
   if test "$build" = "$host"; then
     darwin_try_test=1
@@ -6232,6 +6233,9 @@ if test x"$ld64_flag" = x"yes"; then
     AC_MSG_CHECKING(ld64 specified version)
     gcc_cv_ld64_major=`echo "$gcc_cv_ld64_version" | sed -e 's/\..*//'`
     AC_MSG_RESULT($gcc_cv_ld64_major)
+    if test "$gcc_cv_ld64_major" -ge 97; then
+      gcc_cv_ld64_demangle=1
+    fi
     if test "$gcc_cv_ld64_major" -ge 236; then
       gcc_cv_ld64_export_dynamic=1
     fi
@@ -6246,6 +6250,13 @@ if test x"$ld64_flag" = x"yes"; then
     fi
     AC_MSG_RESULT($gcc_cv_ld64_version)
 
+    AC_MSG_CHECKING(linker for -demangle support)
+    gcc_cv_ld64_demangle=1
+    if $gcc_cv_ld -demangle < /dev/null 2>&1 | grep 'unknown option' > /dev/null; then
+      gcc_cv_ld64_demangle=0
+    fi
+    AC_MSG_RESULT($gcc_cv_ld64_demangle)
+
     AC_MSG_CHECKING(linker for -export_dynamic support)
     gcc_cv_ld64_export_dynamic=1
     if $gcc_cv_ld -export_dynamic < /dev/null 2>&1 | grep 'unknown option' > /dev/null; then
@@ -6266,6 +6277,9 @@ if test x"$ld64_flag" = x"yes"; then
       [Define to ld64 version.])
   fi
 
+  AC_DEFINE_UNQUOTED(LD64_HAS_DEMANGLE, $gcc_cv_ld64_demangle,
+  [Define to 1 if ld64 supports '-demangle'.])
+
   AC_DEFINE_UNQUOTED(LD64_HAS_EXPORT_DYNAMIC, $gcc_cv_ld64_export_dynamic,
   [Define to 1 if ld64 supports '-export_dynamic'.])