Commit b9f44da2 authored by Marc-André Lureau's avatar Marc-André Lureau Committed by Paolo Bonzini
Browse files

build-sys: fix -fsanitize=address check 



Since 218bb57d, the -fsanitize=address
check fails with:
config-temp/qemu-conf.c:3:20: error: integer overflow in expression [-Werror=overflow]
   return INT32_MIN / -1;

Interestingly, UBSAN check doesn't produce a compile time warning.
Use a test that doesn't have compile time warnings, and make it
specific to UBSAN check.

Signed-off-by: default avatarMarc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180215212552.26997-2-marcandre.lureau@redhat.com>
Reviewed-by: default avatarEmilio G. Cota <cota@braap.org>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 961c47bb

configure

+12 −10
Original line number Diff line number Diff line
@@ -5316,25 +5316,27 @@ fi 
##########################################

# checks for sanitizers



# we could use a simple skeleton for flags checks, but this also

# detect the static linking issue of ubsan, see also:

# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84285

cat > $TMPC << EOF

#include <stdint.h>

int main(void) {

  return INT32_MIN / -1;

}

EOF



have_asan=no

have_ubsan=no

have_asan_iface_h=no

have_asan_iface_fiber=no



if test "$sanitizers" = "yes" ; then

  write_c_skeleton

  if compile_prog "$CPU_CFLAGS -Werror -fsanitize=address" ""; then

      have_asan=yes

  fi



  # we could use a simple skeleton for flags checks, but this also

  # detect the static linking issue of ubsan, see also:

  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84285

  cat > $TMPC << EOF

#include <stdlib.h>

int main(void) {

    void *tmp = malloc(10);

    return *(int *)(tmp + 2);

}

EOF

  if compile_prog "$CPU_CFLAGS -Werror -fsanitize=undefined" ""; then

      have_ubsan=yes

  fi