add a macro that really identifies glibc

base/process_util_linux.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/process_util.h"
 
 #include <dirent.h>
 #include <malloc.h>
 #include <sys/time.h>
 #include <sys/types.h>
@@ skipping 727 matching lines @@
     LOG(FATAL) << "Out of memory, size = " << size;
   LOG(FATAL) << "Out of memory.";
 }
 
 void OnNoMemory() {
   OnNoMemorySize(0);
 }
 
 }  // namespace
 
-#if !defined(OS_ANDROID) && !defined(USE_TCMALLOC) && \
-    !defined(ADDRESS_SANITIZER) && !defined(MEMORY_SANITIZER) && \
+#if !defined(ADDRESS_SANITIZER) && !defined(MEMORY_SANITIZER) && \
     !defined(THREAD_SANITIZER)
 
+#if defined(LIBC_GLIBC) && !defined(USE_TCMALLOC)
+
 extern "C" {
 void* __libc_malloc(size_t size);
 void* __libc_realloc(void* ptr, size_t size);
 void* __libc_calloc(size_t nmemb, size_t size);
 void* __libc_valloc(size_t size);
 void* __libc_pvalloc(size_t size);
 void* __libc_memalign(size_t alignment, size_t size);
 
 // Overriding the system memory allocation functions:
 //
@@ skipping 57 matching lines @@
 int posix_memalign(void** ptr, size_t alignment, size_t size)
     __attribute__ ((visibility("default")));
 
 int posix_memalign(void** ptr, size_t alignment, size_t size) {
   // This will use the safe version of memalign, above.
   *ptr = memalign(alignment, size);
   return 0;
 }
 
 }  // extern C
-#endif  // ANDROID, TCMALLOC, *_SANITIZER
+
+#else
+
+// TODO(mostynb@opera.com): dlsym dance
+
+#endif  // LIBC_GLIBC && !USE_TCMALLOC
+
+#endif  // !*_SANITIZER
 
 void EnableTerminationOnHeapCorruption() {
   // On Linux, there nothing to do AFAIK.
 }
 
 void EnableTerminationOnOutOfMemory() {
 #if defined(OS_ANDROID)
   // Android doesn't support setting a new handler.
   DLOG(WARNING) << "Not feasible.";
 #else
@@ skipping 39 matching lines @@
     int score_len = static_cast<int>(score_str.length());
     return (score_len == file_util::WriteFile(oom_file,
                                               score_str.c_str(),
                                               score_len));
   }
 
   return false;
 }
 
 }  // namespace base