tests: sniff for libfuzzer actually being available in test-fuzz-targets.t
When I upgraded the FreeBSD buildbot to 11.2 it seems we picked up
clang6, but the default clang on FreeBSD doesn't include libfuzzer. I
can't find a way to sniff for libfuzzer without running a compile, so
here we are.
Differential Revision: https://phab.mercurial-scm.org/D5270
--- a/tests/test-fuzz-targets.t Wed Nov 14 10:11:37 2018 -0500
+++ b/tests/test-fuzz-targets.t Wed Nov 14 10:12:43 2018 -0500
@@ -11,10 +11,26 @@
> MAKE=make
> fi
+ $ havefuzz() {
+ > cat > $TESTTMP/dummy.cc <<EOF
+ > #include <stdlib.h>
+ > #include <stdint.h>
+ > int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { return 0; }
+ > int main(int argc, char **argv) {
+ > const char data[] = "asdf";
+ > return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);
+ > }
+ > EOF
+ > $CXX $TESTTMP/dummy.cc -o $TESTTMP/dummy \
+ > -fsanitize=fuzzer-no-link,address || return 1
+ > }
+
#if clang-libfuzzer
+ $ CXX=clang++ havefuzz || exit 80
$ $MAKE -s clean all
#endif
#if no-clang-libfuzzer clang-6.0
+ $ CXX=clang++-6.0 havefuzz || exit 80
$ $MAKE -s clean all CC=clang-6.0 CXX=clang++-6.0
#endif
#if no-clang-libfuzzer no-clang-6.0