Add mold detection for libs.

libatomic/ChangeLog:

	* acinclude.m4: Detect *_ld_is_mold and use it.
	* configure: Regenerate.

libgomp/ChangeLog:

	* acinclude.m4: Detect *_ld_is_mold and use it.
	* configure: Regenerate.

libitm/ChangeLog:

	* acinclude.m4: Detect *_ld_is_mold and use it.
	* configure: Regenerate.

libstdc++-v3/ChangeLog:

	* acinclude.m4: Detect *_ld_is_mold and use it.
	* configure: Regenerate.

2 files changed, 15 insertions, 14 deletions

diff --git a/libitm/acinclude.m4 b/libitm/acinclude.m4
index 8efbee9..9fd12e6 100644
--- a/libitm/acinclude.m4
+++ b/libitm/acinclude.m4
@@ -210,6 +210,7 @@ dnl  LD (as a side effect of testing)
 dnl Sets:
 dnl  with_gnu_ld
 dnl  libitm_ld_is_gold (possibly)
+dnl  libitm_ld_is_mold (possibly)
 dnl  libitm_gnu_ld_version (possibly)
 dnl
 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
@@ -242,8 +243,11 @@ AC_DEFUN([LIBITM_CHECK_LINKER_FEATURES], [
   # Start by getting the version number.  I think the libtool test already
   # does some of this, but throws away the result.
   libitm_ld_is_gold=no
+  libitm_ld_is_mold=no
   if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
     libitm_ld_is_gold=yes
+  elif $LD --version 2>/dev/null | grep 'mold' >/dev/null 2>&1; then
+    libitm_ld_is_mold=yes
   fi
   changequote(,)
   ldver=`$LD --version 2>/dev/null |
@@ -399,6 +403,8 @@ if test $enable_symvers != no && test $libitm_shared_libgcc = yes; then
       enable_symvers=gnu
     elif test $libitm_ld_is_gold = yes ; then
       enable_symvers=gnu
+    elif test $libitm_ld_is_mold = yes ; then
+      enable_symvers=gnu
     else
       # The right tools, the right setup, but too old.  Fallbacks?
       AC_MSG_WARN(=== Linker version $libitm_gnu_ld_version is too old for)
diff --git a/libitm/configure b/libitm/configure
index b8f1e23..966bf40 100755
--- a/libitm/configure
+++ b/libitm/configure
@@ -12056,7 +12056,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12069 "configure"
+#line 12059 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12162,7 +12162,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12175 "configure"
+#line 12165 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -14901,16 +14901,6 @@ freebsd* | dragonfly*)
   esac
   ;;
 
-gnu*)
-  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'
-  shlibpath_var=LD_LIBRARY_PATH
-  hardcode_into_libs=yes
-  ;;
-
 haiku*)
   version_type=linux
   need_lib_prefix=no
@@ -15032,7 +15022,7 @@ linux*oldld* | linux*aout* | linux*coff*)
 # project, but have not yet been accepted: they are GCC-local changes
 # for the time being.  (See
 # https://lists.gnu.org/archive/html/libtool-patches/2018-05/msg00000.html)
-linux* | k*bsd*-gnu | kopensolaris*-gnu | uclinuxfdpiceabi)
+linux* | k*bsd*-gnu | kopensolaris*-gnu | gnu* | uclinuxfdpiceabi)
   version_type=linux
   need_lib_prefix=no
   need_version=no
@@ -17085,8 +17075,11 @@ fi
   # Start by getting the version number.  I think the libtool test already
   # does some of this, but throws away the result.
   libitm_ld_is_gold=no
+  libitm_ld_is_mold=no
   if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
     libitm_ld_is_gold=yes
+  elif $LD --version 2>/dev/null | grep 'mold' >/dev/null 2>&1; then
+    libitm_ld_is_mold=yes
   fi
 
   ldver=`$LD --version 2>/dev/null |
@@ -17289,6 +17282,8 @@ if test $enable_symvers != no && test $libitm_shared_libgcc = yes; then
       enable_symvers=gnu
     elif test $libitm_ld_is_gold = yes ; then
       enable_symvers=gnu
+    elif test $libitm_ld_is_mold = yes ; then
+      enable_symvers=gnu
     else
       # The right tools, the right setup, but too old.  Fallbacks?
       { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: === Linker version $libitm_gnu_ld_version is too old for" >&5
@@ -17882,7 +17877,7 @@ case "$host" in
     case "$enable_cet" in
       auto)
 	# Check if target supports multi-byte NOPs
-	# and if assembler supports CET insn.
+	# and if compiler and assembler support CET insn.
 	cet_save_CFLAGS="$CFLAGS"
 	CFLAGS="$CFLAGS -fcf-protection"
 	cat confdefs.h - <<_ACEOF >conftest.$ac_ext