Stop intercepting some malloc-related functions on FreeBSD and macOS

Summary:
In https://bugs.freebsd.org/215125 I was notified that some configure
scripts attempt to test for the Linux-specific `mallinfo` and `mallopt`
functions by compiling and linking small programs which references the
functions, and observing whether that results in errors.

FreeBSD and macOS do not have the `mallinfo` and `mallopt` functions, so
normally these tests would fail, but when sanitizers are enabled, they
incorrectly succeed, because the sanitizers define interceptors for
these functions.  This also applies to some other malloc-related
functions, such as `memalign`, `pvalloc` and `cfree`.

Fix this by not intercepting `mallinfo`, `mallopt`, `memalign`,
`pvalloc` and `cfree` for FreeBSD and macOS, in all sanitizers.

Reviewers: emaste, kcc

Subscribers: hans, joerg, llvm-commits, kubamracek

Differential Revision: https://reviews.llvm.org/D27654


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@293337 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/sanitizer_common/tests/sanitizer_allocator_testlib.cc b/lib/sanitizer_common/tests/sanitizer_allocator_testlib.cc
index c6dd3c4bb..d2920d8f7 100644
--- a/lib/sanitizer_common/tests/sanitizer_allocator_testlib.cc
+++ b/lib/sanitizer_common/tests/sanitizer_allocator_testlib.cc
@@ -139,6 +139,7 @@ void *realloc(void *p, size_t size) {
   return p;
 }
 
+#if SANITIZER_INTERCEPT_MEMALIGN
 void *memalign(size_t alignment, size_t size) {
   if (UNLIKELY(!thread_inited))
     thread_init();
@@ -146,6 +147,7 @@ void *memalign(size_t alignment, size_t size) {
   SANITIZER_MALLOC_HOOK(p, size);
   return p;
 }
+#endif // SANITIZER_INTERCEPT_MEMALIGN
 
 int posix_memalign(void **memptr, size_t alignment, size_t size) {
   if (UNLIKELY(!thread_inited))
@@ -165,18 +167,26 @@ void *valloc(size_t size) {
   return p;
 }
 
+#if SANITIZER_INTERCEPT_CFREE
 void cfree(void *p) ALIAS("free");
+#endif // SANITIZER_INTERCEPT_CFREE
+#if SANITIZER_INTERCEPT_PVALLOC
 void *pvalloc(size_t size) ALIAS("valloc");
+#endif // SANITIZER_INTERCEPT_PVALLOC
+#if SANITIZER_INTERCEPT_MEMALIGN
 void *__libc_memalign(size_t alignment, size_t size) ALIAS("memalign");
+#endif // SANITIZER_INTERCEPT_MEMALIGN
 
 void malloc_usable_size() {
 }
 
+#if SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO
 void mallinfo() {
 }
 
 void mallopt() {
 }
+#endif // SANITIZER_INTERCEPT_MALLOPT_AND_MALLINFO
 }  // extern "C"
 
 namespace std {