[PATCH 3/X] [libsanitizer] Add option to bootstrap using HWASAN

[Matthew Malcomson]

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:

2019-08-29  Matthew Malcomson  <matthew.malcomson@arm.com>

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

config/ChangeLog:

2019-11-07  Matthew Malcomson  <matthew.malcomson@arm.com>

	* bootstrap-hwasan.mk: New file.

libiberty/ChangeLog:

2019-11-07  Matthew Malcomson  <matthew.malcomson@arm.com>

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

lto-plugin/ChangeLog:

2019-11-07  Matthew Malcomson  <matthew.malcomson@arm.com>

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



###############     Attachment also inlined for ease of reply    ###############


diff --git a/config/bootstrap-hwasan.mk b/config/bootstrap-hwasan.mk
new file mode 100644
index 0000000000000000000000000000000000000000..4f60bed3fd6e98b47a3a38aea6eba2a7c320da25
--- /dev/null
+++ b/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
diff --git a/configure b/configure
index aec9186b2b0123d3088b69eb1ee541567654953e..6f71b111bd18ec053180beecf83dd4549e83c2b9 100755
--- a/configure
+++ b/configure
@@ -7270,7 +7270,7 @@ 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
       ;;
diff --git a/configure.ac b/configure.ac
index b8ce2ad20b9d03e42731252a9ec2a8417c13e566..16bfdf164555dad94c789f17b6a63ba1a2e3e9f4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2775,7 +2775,7 @@ 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
       ;;
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 6c9579bfaff955eb43875b404fb7db1a667bf522..427a2f4e56b37e165b72cc166e1acb0732449a8b 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -2645,6 +2645,11 @@ Some examples of build configurations designed for developers of GCC are:
 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
+targets with a very recent linux kernel (5.4 or later).
+
 @section Building a cross compiler
 
 When building a cross compiler, it is not generally possible to do a
diff --git a/libiberty/configure b/libiberty/configure
index 7a34dabec32b0b383bd33f07811757335f4dd39c..cb2dd4ff5295598343cc18b3a79a86a778f2261d 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -5261,6 +5261,7 @@ fi
 NOASANFLAG=
 case " ${CFLAGS} " in
   *\ -fsanitize=address\ *) NOASANFLAG=-fno-sanitize=address ;;
+  *\ -fsanitize=hwaddress\ *) NOASANFLAG=-fno-sanitize=hwaddress ;;
 esac
 
 
diff --git a/libiberty/configure.ac b/libiberty/configure.ac
index f1ce76010c9acde79c5dc46686a78b2e2f19244e..043237628b79cbf37d07359b59c5ffe17a7a22ef 100644
--- a/libiberty/configure.ac
+++ b/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)
 
diff --git a/lto-plugin/Makefile.am b/lto-plugin/Makefile.am
index 28dc21014b2e86988fa88adabd63ce6092e18e02..34aa397d785e3cc9b6975de460d065900364c3ff 100644
--- a/lto-plugin/Makefile.am
+++ b/lto-plugin/Makefile.am
@@ -11,8 +11,8 @@ AM_CPPFLAGS = -I$(top_srcdir)/../include $(DEFS)
 AM_CFLAGS = @ac_lto_plugin_warn_cflags@
 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@
diff --git a/lto-plugin/Makefile.in b/lto-plugin/Makefile.in
index 8dd6e40ac9dddab39fe1752f9a70e6834ab3c926..7acfc047eff6f86f8d38287e6ffb6533c4c13500 100644
--- a/lto-plugin/Makefile.in
+++ b/lto-plugin/Makefile.in
@@ -672,8 +672,8 @@ 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)
 

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