From 9fdc372344cfc717aeb88f9946dafdad71382ec7 Mon Sep 17 00:00:00 2001
From: Alberto Garcia <berto@igalia.com>
Date: Tue, 30 Jan 2018 01:54:00 +0000
Subject: [PATCH] Build wtf/Atomics.cpp only if needed

===================================================================

Gbp-Pq: Name fix-ftbfs-armel.patch
---
 Source/WTF/wtf/CMakeLists.txt | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/Source/WTF/wtf/CMakeLists.txt b/Source/WTF/wtf/CMakeLists.txt
index e29f6ee947..b66ce8945c 100644
--- a/Source/WTF/wtf/CMakeLists.txt
+++ b/Source/WTF/wtf/CMakeLists.txt
@@ -206,7 +206,6 @@ set(WTF_HEADERS
 
 set(WTF_SOURCES
     Assertions.cpp
-    Atomics.cpp
     AutomaticThread.cpp
     BitVector.cpp
     CPUTime.cpp
@@ -338,6 +337,16 @@ if (NOT USE_SYSTEM_MALLOC)
     list(APPEND WTF_LIBRARIES bmalloc)
 endif ()
 
+file(WRITE ${CMAKE_BINARY_DIR}/test_atomics.cpp
+     "int main(void)\n"
+     "{ long long x = 1; return (int) __sync_add_and_fetch_8(&x, 1); }\n")
+try_compile(ATOMICS_BUILD_SUCCEEDED ${CMAKE_BINARY_DIR} ${CMAKE_BINARY_DIR}/test_atomics.cpp)
+message(STATUS "Found __sync_add_and_fetch_8(): ${ATOMICS_BUILD_SUCCEEDED}")
+if (NOT ATOMICS_BUILD_SUCCEEDED)
+    list(APPEND WTF_SOURCES Atomics.cpp)
+endif ()
+file(REMOVE ${CMAKE_BINARY_DIR}/test_atomics.cpp)
+
 list(APPEND WTF_SOURCES
     unicode/icu/CollatorICU.cpp
 )
-- 
2.30.2