[Webkit-unassigned] [Bug 146440] Crash on xLarge memory allocation using bmalloc on 32bit systems

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=146440

--- Comment #3 from Mario Sanchez Prada <mario at webkit.org> ---
(In reply to comment #2)
> [...]
> Also, should disabling this optimization could make sense as a reasonable
> workaround for 2.8.3 (similar to what it's done in bug 127777 with
> -fno-omit-frame-pointer and -fno-tree-dce), would it be ok to propose a
> patch for the CMake files for WebKitGTK+? (Adding Martin to CC)

To be more precise, I was thinking perhaps of something like this:

diff --git a/Source/cmake/OptionsCommon.cmake b/Source/cmake/OptionsCommon.cmake
index 6691526..355d475 100644
--- a/Source/cmake/OptionsCommon.cmake
+++ b/Source/cmake/OptionsCommon.cmake
@@ -99,6 +99,12 @@ endif ()

 string(TOLOWER ${CMAKE_HOST_SYSTEM_PROCESSOR} LOWERCASE_CMAKE_HOST_SYSTEM_PROCESSOR)
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND "${LOWERCASE_CMAKE_HOST_SYSTEM_PROCESSOR}" MATCHES "(i[3-6]86|x86)")
+    # The -ftree-sra optimization (implicit with -O2) causes crashes when
+    # allocating large chunks of memory using bmalloc on Intel 32bit.
+    # See https://bugs.webkit.org/show_bug.cgi?id=146440
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-tree-sra")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-tree-sra")
+
     # To avoid out of memory when building with debug option in 32bit system.
     # See https://bugs.webkit.org/show_bug.cgi?id=77327
     set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "-Wl,--no-keep-memory ${CMAKE_SHARED_LINKER_FLAGS_DEBUG}")

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