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.

12 files changed, 59 insertions, 4 deletions

diff --git a/libsanitizer/Makefile.in b/libsanitizer/Makefile.in
index 65e7f2e..f11219ca 100644
--- a/libsanitizer/Makefile.in
+++ b/libsanitizer/Makefile.in
@@ -214,6 +214,7 @@ ALLOC_FILE = @ALLOC_FILE@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
+AS_SYM_ASSIGN_DEFS = @AS_SYM_ASSIGN_DEFS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
diff --git a/libsanitizer/asan/Makefile.am b/libsanitizer/asan/Makefile.am
index 223d3e0..6af250e 100644
--- a/libsanitizer/asan/Makefile.am
+++ b/libsanitizer/asan/Makefile.am
@@ -3,7 +3,7 @@ AM_CPPFLAGS = -I $(top_srcdir)/include -I $(top_srcdir)
 # May be used by toolexeclibdir.
 gcc_version := $(shell @get_gcc_base_ver@ $(top_srcdir)/../gcc/BASE-VER)
 
-DEFS = -D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DASAN_HAS_EXCEPTIONS=1 -DASAN_NEEDS_SEGV=1 -DCAN_SANITIZE_UB=0 -DASAN_HAS_CXA_RETHROW_PRIMARY_EXCEPTION=0
+DEFS = -D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DASAN_HAS_EXCEPTIONS=1 -DASAN_NEEDS_SEGV=1 -DCAN_SANITIZE_UB=0 -DASAN_HAS_CXA_RETHROW_PRIMARY_EXCEPTION=0 @AS_SYM_ASSIGN_DEFS@
 if USING_MAC_INTERPOSE
 DEFS += -DMAC_INTERPOSE_FUNCTIONS -DMISSING_BLOCKS_SUPPORT
 endif
diff --git a/libsanitizer/asan/Makefile.in b/libsanitizer/asan/Makefile.in
index e88e5e0..ac72e13 100644
--- a/libsanitizer/asan/Makefile.in
+++ b/libsanitizer/asan/Makefile.in
@@ -264,6 +264,7 @@ ALLOC_FILE = @ALLOC_FILE@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
+AS_SYM_ASSIGN_DEFS = @AS_SYM_ASSIGN_DEFS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
@@ -288,7 +289,7 @@ DEFS = -D_GNU_SOURCE -D_DEBUG -D__STDC_CONSTANT_MACROS \
 	-D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS \
 	-DASAN_HAS_EXCEPTIONS=1 -DASAN_NEEDS_SEGV=1 \
 	-DCAN_SANITIZE_UB=0 -DASAN_HAS_CXA_RETHROW_PRIMARY_EXCEPTION=0 \
-	$(am__append_1)
+	@AS_SYM_ASSIGN_DEFS@ $(am__append_1)
 DEPDIR = @DEPDIR@
 DSYMUTIL = @DSYMUTIL@
 DUMPBIN = @DUMPBIN@
diff --git a/libsanitizer/configure b/libsanitizer/configure
index 2edd5c3..6bfd289 100755
--- a/libsanitizer/configure
+++ b/libsanitizer/configure
@@ -651,6 +651,7 @@ ALLOC_FILE
 VIEW_FILE
 BACKTRACE_SUPPORTED
 FORMAT_FILE
+AS_SYM_ASSIGN_DEFS
 SANITIZER_SUPPORTED_FALSE
 SANITIZER_SUPPORTED_TRUE
 USING_MAC_INTERPOSE_FALSE
@@ -12474,7 +12475,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$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=$as_sym_assign_defs
+
+
 # The library needs to be able to read the executable itself.  Compile
 # a file to determine the executable format.  The awk script
 # filetype.awk prints out the file type.
diff --git a/libsanitizer/configure.ac b/libsanitizer/configure.ac
index 5906c8d..8037c94 100644
--- a/libsanitizer/configure.ac
+++ b/libsanitizer/configure.ac
@@ -214,6 +214,19 @@ if test "$libsanitizer_cv_sys_atomic" = "yes"; then
 	    [Define to 1 if you have the __atomic functions])
 fi
 
+# Check if assembler supports symbol assignment.
+AC_CACHE_CHECK([assembler symbol assignment],
+[libsanitizer_cv_as_sym_assign],
+[AC_COMPILE_IFELSE(
+  [AC_LANG_PROGRAM([],
+		   [asm("a = b");])],
+  [libsanitizer_cv_as_sym_assign=yes],
+  [libsanitizer_cv_as_sym_assign=no])])
+if test "$libsanitizer_cv_as_sym_assign" = "yes"; then
+  as_sym_assign_defs=-DHAVE_AS_SYM_ASSIGN=1
+fi
+AC_SUBST(AS_SYM_ASSIGN_DEFS, [$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.
diff --git a/libsanitizer/hwasan/Makefile.in b/libsanitizer/hwasan/Makefile.in
index 87971fd..4420bd6 100644
--- a/libsanitizer/hwasan/Makefile.in
+++ b/libsanitizer/hwasan/Makefile.in
@@ -260,6 +260,7 @@ ALLOC_FILE = @ALLOC_FILE@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
+AS_SYM_ASSIGN_DEFS = @AS_SYM_ASSIGN_DEFS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
diff --git a/libsanitizer/interception/Makefile.in b/libsanitizer/interception/Makefile.in
index 85dd386..2d807c9 100644
--- a/libsanitizer/interception/Makefile.in
+++ b/libsanitizer/interception/Makefile.in
@@ -186,6 +186,7 @@ ALLOC_FILE = @ALLOC_FILE@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
+AS_SYM_ASSIGN_DEFS = @AS_SYM_ASSIGN_DEFS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
diff --git a/libsanitizer/libbacktrace/Makefile.in b/libsanitizer/libbacktrace/Makefile.in
index c0243fa..33faa78 100644
--- a/libsanitizer/libbacktrace/Makefile.in
+++ b/libsanitizer/libbacktrace/Makefile.in
@@ -236,6 +236,7 @@ ALLOC_FILE = @ALLOC_FILE@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
+AS_SYM_ASSIGN_DEFS = @AS_SYM_ASSIGN_DEFS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
diff --git a/libsanitizer/lsan/Makefile.in b/libsanitizer/lsan/Makefile.in
index 078edf0..0870f9e7 100644
--- a/libsanitizer/lsan/Makefile.in
+++ b/libsanitizer/lsan/Makefile.in
@@ -231,6 +231,7 @@ ALLOC_FILE = @ALLOC_FILE@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
+AS_SYM_ASSIGN_DEFS = @AS_SYM_ASSIGN_DEFS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
diff --git a/libsanitizer/sanitizer_common/Makefile.in b/libsanitizer/sanitizer_common/Makefile.in
index 881df60..4514193 100644
--- a/libsanitizer/sanitizer_common/Makefile.in
+++ b/libsanitizer/sanitizer_common/Makefile.in
@@ -224,6 +224,7 @@ ALLOC_FILE = @ALLOC_FILE@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
+AS_SYM_ASSIGN_DEFS = @AS_SYM_ASSIGN_DEFS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
diff --git a/libsanitizer/tsan/Makefile.in b/libsanitizer/tsan/Makefile.in
index fc14a42..5cc6f95 100644
--- a/libsanitizer/tsan/Makefile.in
+++ b/libsanitizer/tsan/Makefile.in
@@ -260,6 +260,7 @@ ALLOC_FILE = @ALLOC_FILE@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
+AS_SYM_ASSIGN_DEFS = @AS_SYM_ASSIGN_DEFS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
diff --git a/libsanitizer/ubsan/Makefile.in b/libsanitizer/ubsan/Makefile.in
index 7e51480e..717d157 100644
--- a/libsanitizer/ubsan/Makefile.in
+++ b/libsanitizer/ubsan/Makefile.in
@@ -225,6 +225,7 @@ ALLOC_FILE = @ALLOC_FILE@
 AMTAR = @AMTAR@
 AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
+AS_SYM_ASSIGN_DEFS = @AS_SYM_ASSIGN_DEFS@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@