libsanitizer: Add option to bootstrap using HWASAN

This is an analogous option to --bootstrap-asan to configure.  It allows
bootstrapping GCC using HWASAN.

For the same reasons as for ASAN we have to avoid using the HWASAN
sanitizer when compiling libiberty and the lto-plugin.

Also add a function to query whether -fsanitize=hwaddress has been
passed.

ChangeLog:

	* configure: Regenerate.
	* configure.ac: Add --bootstrap-hwasan option.

config/ChangeLog:

	* bootstrap-hwasan.mk: New file.

gcc/ChangeLog:

	* doc/install.texi: Document new option.

libiberty/ChangeLog:

	* configure: Regenerate.
	* configure.ac: Avoid using sanitizer.

lto-plugin/ChangeLog:

	* Makefile.am: Avoid using sanitizer.
	* Makefile.in: Regenerate.

config/bootstrap-hwasan.mk

@@ -0,0 +1,8 @@
+# This option enables -fsanitize=hwaddress for stage2 and stage3.
+
+STAGE2_CFLAGS += -fsanitize=hwaddress
+STAGE3_CFLAGS += -fsanitize=hwaddress
+POSTSTAGE1_LDFLAGS += -fsanitize=hwaddress -static-libhwasan \
+		      -B$$r/prev-$(TARGET_SUBDIR)/libsanitizer/ \
+		      -B$$r/prev-$(TARGET_SUBDIR)/libsanitizer/hwasan/ \
+		      -B$$r/prev-$(TARGET_SUBDIR)/libsanitizer/hwasan/.libs

configure

@@ -9305,7 +9305,7 @@ fi
 # or bootstrap-ubsan, bootstrap it.
 if echo " ${target_configdirs} " | grep " libsanitizer " > /dev/null 2>&1; then
   case "$BUILD_CONFIG" in
-    *bootstrap-asan* | *bootstrap-ubsan* )
+    *bootstrap-hwasan* | *bootstrap-asan* | *bootstrap-ubsan* )
       bootstrap_target_libs=${bootstrap_target_libs}target-libsanitizer,
       bootstrap_fixincludes=yes
       ;;

configure.ac

@@ -2814,7 +2814,7 @@ fi
 # or bootstrap-ubsan, bootstrap it.
 if echo " ${target_configdirs} " | grep " libsanitizer " > /dev/null 2>&1; then
   case "$BUILD_CONFIG" in
-    *bootstrap-asan* | *bootstrap-ubsan* )
+    *bootstrap-hwasan* | *bootstrap-asan* | *bootstrap-ubsan* )
       bootstrap_target_libs=${bootstrap_target_libs}target-libsanitizer,
       bootstrap_fixincludes=yes
       ;;

gcc/doc/install.texi

@@ -2805,6 +2805,11 @@ the build tree.
 Compiles GCC itself using Address Sanitization in order to catch invalid memory
 accesses within the GCC code.
 
+@item @samp{bootstrap-hwasan}
+Compiles GCC itself using HWAddress Sanitization in order to catch invalid
+memory accesses within the GCC code.  This option is only available on AArch64
+systems that are running Linux kernel version 5.4 or later.
+
 @end table
 
 @section Building a cross compiler

libiberty/configure

@@ -5264,6 +5264,7 @@ fi
 NOASANFLAG=
 case " ${CFLAGS} " in
   *\ -fsanitize=address\ *) NOASANFLAG=-fno-sanitize=address ;;
+  *\ -fsanitize=hwaddress\ *) NOASANFLAG=-fno-sanitize=hwaddress ;;
 esac
 
 

libiberty/configure.ac

@@ -240,6 +240,7 @@ AC_SUBST(PICFLAG)
 NOASANFLAG=
 case " ${CFLAGS} " in
   *\ -fsanitize=address\ *) NOASANFLAG=-fno-sanitize=address ;;
+  *\ -fsanitize=hwaddress\ *) NOASANFLAG=-fno-sanitize=hwaddress ;;
 esac
 AC_SUBST(NOASANFLAG)
 

lto-plugin/Makefile.am

@@ -11,8 +11,8 @@ AM_CPPFLAGS = -I$(top_srcdir)/../include $(DEFS)
 AM_CFLAGS = @ac_lto_plugin_warn_cflags@ $(CET_HOST_FLAGS)
 AM_LDFLAGS = @ac_lto_plugin_ldflags@
 AM_LIBTOOLFLAGS = --tag=disable-static
-override CFLAGS := $(filter-out -fsanitize=address,$(CFLAGS))
-override LDFLAGS := $(filter-out -fsanitize=address,$(LDFLAGS))
+override CFLAGS := $(filter-out -fsanitize=address -fsanitize=hwaddress,$(CFLAGS))
+override LDFLAGS := $(filter-out -fsanitize=address -fsanitize=hwaddress,$(LDFLAGS))
 
 libexecsub_LTLIBRARIES = liblto_plugin.la
 gcc_build_dir = @gcc_build_dir@

lto-plugin/Makefile.in

@@ -675,8 +675,8 @@ uninstall-am: uninstall-libexecsubLTLIBRARIES
 
 .PRECIOUS: Makefile
 
-override CFLAGS := $(filter-out -fsanitize=address,$(CFLAGS))
-override LDFLAGS := $(filter-out -fsanitize=address,$(LDFLAGS))
+override CFLAGS := $(filter-out -fsanitize=address -fsanitize=hwaddress,$(CFLAGS))
+override LDFLAGS := $(filter-out -fsanitize=address -fsanitize=hwaddress,$(LDFLAGS))
 
 all-local: $(in_gcc_libs)