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Require -fPIC instead of just -fPIE for -reduce-relocations

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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>
This commit is contained in:
Thiago Macieira 2015-05-05 08:43:42 -07:00 committed by Simon Hausmann
parent ace86dca15
commit 36d6eb721e
6 changed files with 9 additions and 9 deletions
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2
mkspecs/common/gcc-base.conf
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@ -42,7 +42,7 @@ QMAKE_CFLAGS_RELEASE += $$QMAKE_CFLAGS_OPTIMIZE
QMAKE_CFLAGS_DEBUG += -g
QMAKE_CFLAGS_SHLIB += -fPIC
QMAKE_CFLAGS_STATIC_LIB += -fPIC
QMAKE_CFLAGS_APP += -fPIE
QMAKE_CFLAGS_APP += -fPIC
QMAKE_CFLAGS_ISYSTEM = -isystem
QMAKE_CFLAGS_YACC += -Wno-unused -Wno-parentheses
QMAKE_CFLAGS_HIDESYMS += -fvisibility=hidden

2
mkspecs/common/qcc-base.conf
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@ -23,7 +23,7 @@ QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_OPTIMIZE -g
QMAKE_CFLAGS_DEBUG += -g
QMAKE_CFLAGS_SHLIB += -fPIC -shared
QMAKE_CFLAGS_STATIC_LIB += -fPIC
QMAKE_CFLAGS_APP += -fPIE
QMAKE_CFLAGS_APP += -fPIC
QMAKE_CFLAGS_YACC += -Wno-unused -Wno-parentheses
QMAKE_CFLAGS_HIDESYMS += -fvisibility=hidden
QMAKE_CFLAGS_SSE2 += -msse2

2
mkspecs/linux-icc/qmake.conf
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@ -12,7 +12,7 @@ QMAKE_LEXFLAGS =
QMAKE_YACC = yacc
QMAKE_YACCFLAGS = -d
QMAKE_CFLAGS =
QMAKE_CFLAGS_APP = -fPIE
QMAKE_CFLAGS_APP = -fPIC
QMAKE_CFLAGS_DEPS = -M
QMAKE_CFLAGS_WARN_ON = -w1 -Wall -Wcheck -wd1572,873,2259,2261
QMAKE_CFLAGS_WARN_OFF = -w

2
src/corelib/Qt5CoreConfigExtras.cmake.in
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@ -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)

4
src/corelib/global/qglobal.h
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@ -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 {

6
tests/auto/tools/moc/tst_moc.cpp
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@ -662,7 +662,7 @@ void tst_Moc::oldStyleCasts()
QStringList args;
args << "-c" << "-x" << "c++" << "-Wold-style-cast" << "-I" << "."
<< "-I" << qtIncludePath << "-o" << "/dev/null" << "-fPIE" << "-";
<< "-I" << qtIncludePath << "-o" << "/dev/null" << "-fPIC" << "-";
proc.start("gcc", args);
QVERIFY(proc.waitForStarted());
proc.write(mocOut);
@ -732,7 +732,7 @@ void tst_Moc::inputFileNameWithDotsButNoExtension()
QStringList args;
args << "-c" << "-x" << "c++" << "-I" << ".."
<< "-I" << qtIncludePath << "-o" << "/dev/null" << "-fPIE" << "-";
<< "-I" << qtIncludePath << "-o" << "/dev/null" << "-fPIC" << "-";
proc.start("gcc", args);
QVERIFY(proc.waitForStarted());
proc.write(mocOut);
@ -1011,7 +1011,7 @@ void tst_Moc::ignoreOptionClashes()
// If -pthread wasn't ignored, it was parsed as a prefix of "thread/", which breaks compilation.
QStringList gccArgs;
gccArgs << "-c" << "-x" << "c++" << "-I" << ".."
<< "-I" << qtIncludePath << "-I" << includeDir << "-o" << "/dev/null" << "-fPIE" << "-";
<< "-I" << qtIncludePath << "-I" << includeDir << "-o" << "/dev/null" << "-fPIC" << "-";
proc.start("gcc", gccArgs);
QVERIFY(proc.waitForStarted());
proc.write(mocOut);