libsanitizer: Check assembler support for symbol assignment [PR112563]

The recent libsanitizer import broke the build on Solaris/SPARC with the
native as:

/usr/ccs/bin/as: ".libs/sanitizer_errno.s", line 4247: error: symbol
"__sanitizer_internal_memset" is used but not defined
/usr/ccs/bin/as: ".libs/sanitizer_errno.s", line 4247: error: symbol
"__sanitizer_internal_memcpy" is used but not defined
/usr/ccs/bin/as: ".libs/sanitizer_errno.s", line 4247: error: symbol
"__sanitizer_internal_memmove" is used but not defined

Since none of the alternatives considered in the PR worked out, this
patch checks if the assembler does support symbol assignment, disabling
the code otherwise.  This returns the code to the way it was up to LLVM 16.

Bootstrapped without regressions on sparc-sun-solaris2.11 (as and gas) and
i386-pc-solaris2.11 (as and gas).

2023-11-23  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	libsanitizer:
	PR sanitizer/112563
	* configure.ac (libsanitizer_cv_as_sym_assign): Check for
	assembler symbol assignment support.
	* configure: Regenerate.
	* asan/Makefile.am (DEFS): Add @AS_SYM_ASSIGN_DEFS@.
	* Makefile.in, asan/Makefile.in, hwasan/Makefile.in,
	interception/Makefile.in, libbacktrace/Makefile.in,
	lsan/Makefile.in, sanitizer_common/Makefile.in, tsan/Makefile.in,
	ubsan/Makefile.in: Regenerate.

1 files changed, 35 insertions, 2 deletions

diff --git a/libsanitizer/configure b/libsanitizer/configure
index 2edd5c37ce7..6bfd28916d2 100755
--- a/libsanitizer/configure
+++ b/libsanitizer/configure
@@ -651,6 +651,7 @@ ALLOC_FILE
 VIEW_FILE
 BACKTRACE_SUPPORTED
 FORMAT_FILE
+AS_SYM_ASSIGN_DEFS
 SANITIZER_SUPPORTED_FALSE
 SANITIZER_SUPPORTED_TRUE
 USING_MAC_INTERPOSE_FALSE
@@ -12474,7 +12475,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12477 "configure"
+#line 12478 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12580,7 +12581,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12583 "configure"
+#line 12584 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -16333,6 +16334,38 @@ $as_echo "#define HAVE_ATOMIC_FUNCTIONS 1" >>confdefs.h
 
 fi
 
+# Check if assembler supports symbol assignment.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler symbol assignment" >&5
+$as_echo_n "checking assembler symbol assignment... " >&6; }
+if ${libsanitizer_cv_as_sym_assign+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+asm("a = b");
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libsanitizer_cv_as_sym_assign=yes
+else
+  libsanitizer_cv_as_sym_assign=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libsanitizer_cv_as_sym_assign" >&5
+$as_echo "$libsanitizer_cv_as_sym_assign" >&6; }
+if test "$libsanitizer_cv_as_sym_assign" = "yes"; then
+  as_sym_assign_defs=-DHAVE_AS_SYM_ASSIGN=1
+fi
+AS_SYM_ASSIGN_DEFS=$as_sym_assign_defs
+
+
 # The library needs to be able to read the executable itself.  Compile
 # a file to determine the executable format.  The awk script
 # filetype.awk prints out the file type.