diff options
| author | Thiago Macieira <thiago.macieira@intel.com> | 2015-05-05 08:43:42 -0700 |
|---|---|---|
| committer | Simon Hausmann <simon.hausmann@theqtcompany.com> | 2015-05-07 19:42:43 +0000 |
| commit | 36d6eb721e7d5997ade75e289d4088dc48678d0d (patch) | |
| tree | 208215fcc41b726e3f401936724ffbc4e427dbee /src | |
| parent | ace86dca159d50886be5bcff7abe72383cad9fde (diff) | |
Require -fPIC instead of just -fPIE for -reduce-relocations
GCC 5 combined with a recent binutils have a new optimization that
allows them to generate copy relocations even in -fPIE code. Clang has
the same functionality when compiling an executable with -flto. We need
to let the compilers know that they cannot use copy relocations, so they
need to use really position-independent code.
Position independent code throughout is not really required. We just
need the compilers to use position-independent access to symbols coming
from the Qt libraries, but there's currently no other way of doing that.
Task-number: QTBUG-45755
Change-Id: I0d4913955e3745b69672ffff13db5df7377398c5
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/corelib/Qt5CoreConfigExtras.cmake.in | 2 | ||||
| -rw-r--r-- | src/corelib/global/qglobal.h | 4 |
2 files changed, 3 insertions, 3 deletions
diff --git a/src/corelib/Qt5CoreConfigExtras.cmake.in b/src/corelib/Qt5CoreConfigExtras.cmake.in index 7213a844f5..48d5f21447 100644 --- a/src/corelib/Qt5CoreConfigExtras.cmake.in +++ b/src/corelib/Qt5CoreConfigExtras.cmake.in @@ -71,7 +71,7 @@ set(_qt5_corelib_extra_includes) # macro to add it. set(Qt5_POSITION_INDEPENDENT_CODE True) set_property(TARGET Qt5::Core PROPERTY INTERFACE_POSITION_INDEPENDENT_CODE \"ON\") -set(Qt5Core_EXECUTABLE_COMPILE_FLAGS \"-fPIE\") +set(Qt5Core_EXECUTABLE_COMPILE_FLAGS \"-fPIC\") !!IF !isEmpty(QT_NAMESPACE) list(APPEND Qt5Core_DEFINITIONS -DQT_NAMESPACE=$$QT_NAMESPACE) diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h index 455582e310..ef84662036 100644 --- a/src/corelib/global/qglobal.h +++ b/src/corelib/global/qglobal.h @@ -1047,9 +1047,9 @@ Q_CORE_EXPORT int qrand(); # define QT_NO_SHAREDMEMORY #endif -#if !defined(QT_BOOTSTRAPPED) && defined(QT_REDUCE_RELOCATIONS) && defined(__ELF__) && !defined(__PIC__) && !defined(__PIE__) +#if !defined(QT_BOOTSTRAPPED) && defined(QT_REDUCE_RELOCATIONS) && defined(__ELF__) && !defined(__PIC__) # error "You must build your code with position independent code if Qt was built with -reduce-relocations. "\ - "Compile your code with -fPIC or -fPIE." + "Compile your code with -fPIC." #endif namespace QtPrivate { |