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Diffstat (limited to 'dist/changes-5.4.2')
| -rw-r--r-- | dist/changes-5.4.2 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/dist/changes-5.4.2 b/dist/changes-5.4.2 index e1ad9b6846..1a34898011 100644 --- a/dist/changes-5.4.2 +++ b/dist/changes-5.4.2 @@ -34,6 +34,23 @@ information about a particular change. common EXIF-format (big-endian) was not working until 5.4.1. 5.4.2 restores the behavior of 5.4.0 and earlier for most EXIF-tagged JPEGs. EXIF orientation will be an opt-in starting with Qt 5.5. +- 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 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 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 * |