[GWP-ASan] Disable GWP-ASan on Android for now.

Summary:
Temporarily disable GWP-ASan for android until the bugs at:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-android/builds/87
... can be fixed. See comments for the full bug trace.

Reviewers: eugenis

Reviewed By: eugenis

Subscribers: srhines, kubamracek, mgorny, cryptoad, jfb, #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D63460

llvm-svn: 363624

Author: hctim

compiler-rt/cmake/config-ix.cmake

@@ -687,8 +687,10 @@ endif()
 # Note: Fuchsia and Windows are not currently supported by GWP-ASan. Support
 # is planned for these platforms. Darwin is also not supported due to TLS
 # calling malloc on first use.
+# TODO(hctim): Enable this on Android again. Looks like it's causing a SIGSEGV
+# for Scudo and GWP-ASan, further testing needed.
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND GWP_ASAN_SUPPORTED_ARCH AND
-    OS_NAME MATCHES "Android|Linux")
+    OS_NAME MATCHES "Linux")
   set(COMPILER_RT_HAS_GWP_ASAN TRUE)
 else()
   set(COMPILER_RT_HAS_GWP_ASAN FALSE)

compiler-rt/lib/gwp_asan/CMakeLists.txt

@@ -21,7 +21,8 @@ set(GWP_ASAN_HEADERS
 # Ensure that GWP-ASan meets the delegated requirements of some supporting
 # allocators. Some supporting allocators (e.g. scudo standalone) cannot use any
 # parts of the C++ standard library.
-set(GWP_ASAN_CFLAGS -fno-rtti -fno-exceptions -fPIC -nostdinc++ -pthread)
+set(GWP_ASAN_CFLAGS -fno-rtti -fno-exceptions -nostdinc++ -pthread)
+append_list_if(COMPILER_RT_HAS_FPIC_FLAG -fPIC GWP_ASAN_CFLAGS)
 
 # Remove -stdlib= which is unused when passing -nostdinc++.
 string(REGEX REPLACE "-stdlib=[a-zA-Z+]*" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})