diff options
| author | Jonathan Liu <net147@gmail.com> | 2016-08-24 11:18:37 +1000 |
|---|---|---|
| committer | Jonathan Liu <net147@gmail.com> | 2016-08-28 21:06:17 +0000 |
| commit | fcc2c95421710f98c7b2dec73e2c8b0d9164bc9b (patch) | |
| tree | 68bde75b486710445df53fbaee1f3386046ca1a7 /src | |
| parent | 7179846a0141c2683c30d03c43a7c12fde98801f (diff) | |
Workaround crashes in QtQml code related to dead-store elimination
When compiled in release mode with GCC 6, QtQml may crash.
This is because the C++ compiler is more aggressive about dead-store
elimination in situations where a memory store to a location precedes
the construction of an object at that memory location.
The QV4::MemoryManager::allocate{Managed,Object} functions allocate
memory and write to it before the caller does a placement new to
construct an object in the same memory. The compiler considers these
writes before the constructor as "dead stores" and eliminates them.
The -fno-lifetime-dse compiler flag is added to disable this more
aggressive dead-store eliminiation optimization.
This is a temporary workaround until a proper solution is found.
Task-number: QTBUG-55482
Change-Id: I7dbae6e9e613e53ce5fb25957c449bc6657803b5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/qml/qml.pro | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/qml/qml.pro b/src/qml/qml.pro index f4862a17a6..651afa6b75 100644 --- a/src/qml/qml.pro +++ b/src/qml/qml.pro @@ -18,7 +18,7 @@ exists("qqml_enable_gcov") { greaterThan(QT_GCC_MAJOR_VERSION, 5) { # Our code is bad. Temporary workaround. - QMAKE_CXXFLAGS += -fno-delete-null-pointer-checks + QMAKE_CXXFLAGS += -fno-delete-null-pointer-checks -fno-lifetime-dse } QMAKE_DOCS = $$PWD/doc/qtqml.qdocconf |