diff options
| author | Stephen Kelly <steveire@gmail.com> | 2015-05-28 21:20:55 +0200 |
|---|---|---|
| committer | Thiago Macieira <thiago.macieira@intel.com> | 2015-05-29 00:08:41 +0000 |
| commit | e3983c87280ade48b243d9c60bed639713851be9 (patch) | |
| tree | c370ee7f6fb9ffaad46501e89b528ed4a0558991 /dist | |
| parent | 95b6c4fed6521aa2212cab67cb8a6e5553e86117 (diff) | |
Revert some changes in light of GCC 4 -fPIE reversalv5.4.2
The -fPIE option is now accepted when using GCC 4, which means it
is available for backward compatibility for clients using
CMake 2.8.11 or older which makes use of the
POSITION_INDEPENDENT_CODE feature.
Conditionally use that feature for old versions of cmake with
GCC 4. Restore the tests for those versions, and clarify the
situation in the ChangeLog.
Change-Id: I5a06b155dda7db559d86841a2b34fd8ed95acbd0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'dist')
| -rw-r--r-- | dist/changes-5.4.2 | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/dist/changes-5.4.2 b/dist/changes-5.4.2 index 29d3c6346d..1a34898011 100644 --- a/dist/changes-5.4.2 +++ b/dist/changes-5.4.2 @@ -37,14 +37,20 @@ information about a particular change. - On x86 and x86-64 systems with ELF binaries (especially Linux), due to a new optimization in GCC 5.x in combination with a recent version of GNU binutils, compiling Qt applications with -fPIE is no longer - enough. Applications now need to be compiled with the -fPIC option if - Qt's option "reduce relocations" is active. Note that Clang is known - to generate incompatible code even with -fPIC if the -flto option is - active. + enough with GCC 5.x. Applications now need to be compiled with + the -fPIC option if Qt's option "reduce relocations" is active. For + backward compatibility only, Qt accepts the use of -fPIE for GCC 4.x + versions. + Note that Clang is known to generate incompatible code even with -fPIC if + the -flto option is active. Applications using qmake or cmake >= 2.8.12 as their build system will - adapt automatically. Applications using an older release of cmake need to - change their CMakeLists.txt to add Qt5Core_EXECUTABLE_COMPILE_FLAGS to - CMAKE_CXX_FLAGS. + adapt automatically. Applications using an older release of cmake in + combination with GCC 5.x need to change their CMakeLists.txt to add + Qt5Core_EXECUTABLE_COMPILE_FLAGS to CMAKE_CXX_FLAGS. In particular, + applications using cmake >= 2.8.9 and < 2.8.11 will continue to build + with the -fPIE option and invoke the special compatibility mode if using + GCC 4.x. + **************************************************************************** * Library * |