AIX: Work around for malloc(0) behavior

test/cctest/wasm/wasm-run-utils.h

Index: test/cctest/wasm/wasm-run-utils.h
diff --git a/test/cctest/wasm/wasm-run-utils.h b/test/cctest/wasm/wasm-run-utils.h
index fe9bbe9a2f55fa03c0b489b16304e91941ce1fb8..4a7e2972daca4c9800d754b95abcb580b40cd75a 100644
--- a/test/cctest/wasm/wasm-run-utils.h
+++ b/test/cctest/wasm/wasm-run-utils.h
@@ -109,7 +109,13 @@ class TestingModule : public ModuleEnv {
     CHECK_NULL(instance->mem_start);
     CHECK_EQ(0, instance->mem_size);
     module_.has_memory = true;
+// Work around for GCC bug on AIX
+// See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79839
+#if V8_OS_AIX && _LINUX_SOURCE_COMPAT

[titzer, 2017/03/04 23:29:56]

What about changing the CHECK() below to be CHECK(size || instance->mem_start)?
Or use a fancy CHECK_IMPLIES()..

[JaideepBajwa, 2017/03/05 05:11:03]

should the CHECK() be: CHECK(size == 0 || instance->mem_start)? because size and
instance->mem_start would both be 0 on aix and it would fail.

[JaideepBajwa, 2017/03/06 22:35:26]

Done.

+    instance->mem_start = reinterpret_cast<byte*>(__linux_malloc(size));
+#else
     instance->mem_start = reinterpret_cast<byte*>(malloc(size));
+#endif
     CHECK(instance->mem_start);
     memset(instance->mem_start, 0, size);
     instance->mem_size = size;