From: Alberto Garcia <berto@igalia.com>
Date: Wed, 21 Mar 2018 12:31:13 +0000 (+0000)
Subject: Detect __sync_add_and_fetch_8() and __atomic_fetch_add_8()
X-Git-Tag: archive/raspbian/2.20.0-2+rpi1^2~7
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=e68c74d8cdf9eb3b3d6f3ffb718499bb06a1aff5;p=webkit2gtk.git

Detect __sync_add_and_fetch_8() and __atomic_fetch_add_8()

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

Gbp-Pq: Name fix-atomics-build.patch
---

diff --git a/Source/JavaScriptCore/CMakeLists.txt b/Source/JavaScriptCore/CMakeLists.txt
index 94036df921..d3d8c841c1 100644
--- a/Source/JavaScriptCore/CMakeLists.txt
+++ b/Source/JavaScriptCore/CMakeLists.txt
@@ -116,15 +116,15 @@ set(JavaScriptCore_LIBRARIES
     ${LLVM_LIBRARIES}
 )
 
-# Since r228149, on MIPS we need to link with -latomic, because
-# __atomic_fetch_add_8 is not available as a compiler intrinsic. It is
-# available on other platforms (including 32-bit Arm), so the link with
-# libatomic is only neede on MIPS.
-if (WTF_CPU_MIPS)
-    list(APPEND JavaScriptCore_LIBRARIES
-        -latomic
-    )
+file(WRITE ${CMAKE_BINARY_DIR}/test_atomics.cpp
+     "int main(void)\n"
+     "{ long long x = 1; return (int) __atomic_fetch_add_8(&x, 1, 1); }\n")
+try_compile(ATOMICS_BUILD_SUCCEEDED ${CMAKE_BINARY_DIR} ${CMAKE_BINARY_DIR}/test_atomics.cpp)
+message(STATUS "Found __atomic_fetch_add_8(): ${ATOMICS_BUILD_SUCCEEDED}")
+if (NOT ATOMICS_BUILD_SUCCEEDED)
+    list(APPEND JavaScriptCore_LIBRARIES -latomic)
 endif ()
+file(REMOVE ${CMAKE_BINARY_DIR}/test_atomics.cpp)
 
 set(JavaScriptCore_SCRIPTS_SOURCES_DIR "${JAVASCRIPTCORE_DIR}/Scripts")
 
diff --git a/Source/WTF/wtf/CMakeLists.txt b/Source/WTF/wtf/CMakeLists.txt
index 220bafd348..bc34609fdb 100644
--- a/Source/WTF/wtf/CMakeLists.txt
+++ b/Source/WTF/wtf/CMakeLists.txt
@@ -315,7 +315,6 @@ set(WTF_HEADERS
 
 set(WTF_SOURCES
     Assertions.cpp
-    Atomics.cpp
     AutomaticThread.cpp
     BitVector.cpp
     CPUTime.cpp
@@ -458,6 +457,16 @@ 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/CollatorDefault.cpp