Allow libsanitizer on architectures that support it

libsanitizer is only supported on selected architectures. Add
ARCH_SUPPORTS_LIBSANITIZER and have architectures select this option
based on the list of supported configurations from GCC's
libsanitizer/configure.tgt. Support for mips64 was added in GCC12 so
this is an additional condition for the mips architecture.

Fixes #1733

Signed-off-by: Chris Packham <judge.packham@gmail.com>

config/arch/arm.in

@@ -16,6 +16,7 @@
 ## select ARCH_SUPPORTS_WITH_FLOAT if ARCH_32 && !MULTILIB
 ## select ARCH_SUPPORTS_WITH_FPU if ARCH_32 && !MULTILIB
 ## select ARCH_SUPPORTS_SOFTFP if ARCH_32 && !MULTILIB
+## select ARCH_SUPPORTS_LIBSANITIZER
 ## select LINUX_REQUIRE_3_7_or_later if ARCH_64 && KERNEL_LINUX
 
 ## help The ARM architecture, as defined by:

config/arch/mips.in

@@ -10,6 +10,7 @@
 ## select ARCH_SUPPORTS_WITH_ARCH
 ## select ARCH_SUPPORTS_WITH_TUNE
 ## select ARCH_SUPPORTS_WITH_FLOAT
+## select ARCH_SUPPORTS_LIBSANITIZER if (!ARCH_64 || GCC_12_or_later)
 
 ## help The MIPS architecture, as defined by:
 ## help     http://www.mips.com/

config/arch/powerpc.in

@@ -12,6 +12,7 @@
 ## select ARCH_SUPPORTS_WITH_TUNE
 ## select ARCH_SUPPORTS_WITH_FLOAT
 ## select ARCH_SUPPORTS_WITH_32_64
+## select ARCH_SUPPORTS_LIBSANITIZER
 ##
 ## help The PowerPC architecture, as defined by:
 ## help     http://www.ibm.com/developerworks/eserver/articles/archguide.html

config/arch/riscv.in

@@ -10,6 +10,7 @@
 ## select ARCH_SUPPORTS_WITH_ABI
 ## select ARCH_SUPPORTS_WITH_ARCH
 ## select ARCH_SUPPORTS_WITH_TUNE
+## select ARCH_SUPPORTS_LIBSANITIZER if ARCH_64
 ## select GCC_REQUIRE_7_or_later
 ## select BINUTILS_REQUIRE_2_28_or_later
 ## select GDB_REQUIRE_8_0_or_later if DEBUG_GDB

config/arch/s390.in

@@ -6,6 +6,7 @@
 ## select ARCH_DEFAULT_32
 ## select ARCH_USE_MMU
 ## select ARCH_SUPPORTS_WITH_FPU
+## select ARCH_SUPPORTS_LIBSANITIZER
 ##
 ## help Defined by IBM in:
 ## help     32-bit ESA/390       : http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/dz9ar008/CCONTENTS

config/arch/sparc.in

@@ -11,6 +11,7 @@
 ## select ARCH_SUPPORTS_WITH_TUNE
 ## select ARCH_SUPPORTS_WITH_FLOAT
 ## select ARCH_SUPPORTS_WITH_32_64 if GCC_6_or_later
+## select ARCH_SUPPORTS_LIBSANITIZER
 ##
 ## help The SUN SPARC architecture, as defined by:
 ## help     32 bit: http://www.sparc.org/standards/V8.pdf

config/arch/x86.in

@@ -9,6 +9,7 @@
 ## select ARCH_SUPPORTS_WITH_CPU
 ## select ARCH_SUPPORTS_WITH_TUNE
 ## select ARCH_SUPPORTS_WITH_32_64
+## select ARCH_SUPPORTS_LIBSANITIZER if ARCH_64
 ##
 ## help The x86 architecture, as defined by:
 ## help     32-bit (ia32) : http://www.intel.com/

config/cc/gcc.in

@@ -258,17 +258,24 @@ config CC_GCC_LIBQUADMATH
       The default is 'N'. Say 'Y' if you need it, and report success/failure.
 
 config CC_GCC_LIBSANITIZER
-    bool
+    tristate
     prompt "Compile libsanitizer"
     depends on THREADS_NATIVE
     depends on !LIBC_UCLIBC_NG && !LIBC_MUSL # Currently lacks required headers (like netrom.h)
+    depends on ARCH_SUPPORTS_LIBSANITIZER
     help
       libsanitizer is a library which provides run-time sanitising of either
       or both of:
         - memory access patterns (out-of-bonds, use-after-free)
         - racy data accesses (in multi-threaded programs)
 
-      The default is 'N'. Say 'Y' if you need it, and report success/failure.
+       Option  | libsanitizer       | Associated ./configure switch
+      ---------+--------------------+--------------------------------
+         Y     | forcibly used      | --enable-libsanitizer
+         M     | auto               | (none, ./configure decides)
+         N     | forcibly not used  | --disable-libsanitizer
+
+      The default is 'N'. Say 'Y' or 'M' if you need it, and report success/failure.
 
 config CC_GCC_LIBMPX
     bool

config/target.in

@@ -111,6 +111,10 @@ config ARCH_USE_MMU
 config ARCH_SUPPORTS_FLAT_FORMAT
     bool
 
+#--------------------------------------
+config ARCH_SUPPORTS_LIBSANITIZER
+    bool
+
 #--------------------------------------
 config ARCH_SUPPORTS_EITHER_ENDIAN
     bool

scripts/build/cc/gcc.sh

@@ -1004,11 +1004,11 @@ do_gcc_backend() {
         extra_config+=(--disable-libquadmath-support)
     fi
 
-    if [ "${CT_CC_GCC_LIBSANITIZER}" = "y" ]; then
-        extra_config+=(--enable-libsanitizer)
-    else
-        extra_config+=(--disable-libsanitizer)
-    fi
+    case "${CT_CC_GCC_LIBSANITIZER}" in
+        y) extra_config+=(--enable-libsanitizer);;
+        m) ;;
+        "") extra_config+=(--disable-libsanitizer);;
+    esac
 
     if [ "${CT_CC_GCC_HAS_LIBMPX}" = "y" ]; then
         if [ "${CT_CC_GCC_LIBMPX}" = "y" ]; then