cc/gcc: add option to enable/disable libsanitizer

libsaniotizer requires a few headers that are not in uClibc, for
example. Also, it is only available for native threads (NPTL under
glibc.) Finally, it is only available starting with gcc-4.8.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

config/cc/gcc.in

@@ -368,6 +368,7 @@ config CC_GCC_4_8
     select CC_GCC_HAS_BUILD_ID
     select CC_GCC_HAS_LNK_HASH_STYLE
     select CC_GCC_HAS_LIBQUADMATH
+    select CC_GCC_HAS_LIBSANITIZER
     select CC_SUPPORT_GOLANG
 
 config CC_GCC_4_8_or_later
@@ -385,6 +386,7 @@ config CC_GCC_4_9
     select CC_GCC_HAS_BUILD_ID
     select CC_GCC_HAS_LNK_HASH_STYLE
     select CC_GCC_HAS_LIBQUADMATH
+    select CC_GCC_HAS_LIBSANITIZER
     select CC_SUPPORT_GOLANG
 
 config CC_GCC_4_9_or_later
@@ -402,6 +404,7 @@ config CC_GCC_latest
     select CC_GCC_HAS_BUILD_ID
     select CC_GCC_HAS_LNK_HASH_STYLE
     select CC_GCC_HAS_LIBQUADMATH
+    select CC_GCC_HAS_LIBSANITIZER
 
 config CC_GCC_HAS_GRAPHITE
     bool
@@ -482,6 +485,9 @@ config CC_GCC_USE_LIBELF
 config CC_GCC_HAS_LIBQUADMATH
     bool
 
+config CC_GCC_HAS_LIBSANITIZER
+    bool
+
 config CC_VERSION
     string
 # Don't remove next line

config/cc/gcc.in.2

@@ -143,6 +143,20 @@ config CC_GCC_LIBQUADMATH
       
       The default is 'N'. Say 'Y' if you need it, and report success/failure.
 
+config CC_GCC_LIBSANITIZER
+    bool
+    prompt "Compile libsanitizer"
+    depends on CC_GCC_HAS_LIBSANITIZER
+    depends on THREADS_NATIVE
+    depends on ! LIBC_uClibc # Currently lacks required headers (like netrom.h)
+    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.
+
 #-----------------------------------------------------------------------------
 
 comment "Misc. obscure options."

scripts/build/cc/gcc.sh

@@ -657,9 +657,6 @@ do_cc_backend() {
         if [ "${CT_THREADS}" = "none" ]; then
             extra_config+=(--disable-libatomic)
         fi
-        if [ "${CT_THREADS}" != "nptl" ]; then
-            extra_config+=(--disable-libsanitizer)
-        fi
     fi
     if [ "${CT_CC_GCC_LIBMUDFLAP}" = "y" ]; then
         extra_config+=(--enable-libmudflap)
@@ -685,6 +682,13 @@ do_cc_backend() {
             extra_config+=(--disable-libquadmath-support)
         fi
     fi
+    if [ "${CT_CC_GCC_HAS_LIBSANITIZER}" = "y" ]; then
+        if [ "${CT_CC_GCC_LIBSANITIZER}" = "y" ]; then
+            extra_config+=(--enable-libsanitizer)
+        else
+            extra_config+=(--disable-libsanitizer)
+        fi
+    fi
 
     final_LDFLAGS+=("${ldflags}")