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build-sys: fix -fsanitize=address check

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Since 218bb57dd79d6843e0592c30a82ea8c1fddc74a5, 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.

Backports commit b9f44da2f2cdc1a1a1be5aed0c46bd7fcc69cf4a from qemu
This commit is contained in:
Marc-André Lureau 2018-03-09 11:51:53 -05:00 committed by Lioncash
parent 0aa640a303
commit 234f2ca184
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 12 additions and 10 deletions
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22
qemu/configure vendored
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@ -1186,23 +1186,25 @@ 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 > $TMPC << EOF
#include <stdint.h>
int main(void) {
return INT32_MIN / -1;
}
EOF
have_asan=no
have_ubsan=no
if test "$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