AuroraMiddleware/qt5base-lts
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Strip bootstrapped binaries of unused sections

Browse Source 
This matches the -ffunction-sections from bootstrap.pro, which tells the
compiler to create a section for each function. The -gc-sections option
tells the linker to drop what wasn't used (normally, it only drops
entire files).

Before (on Linux, built with -O3, no LTO):
   text    data     bss     dec     hex filename
1746385    7920    3750 1758055  1ad367 bin/moc
1444101    6664    1894 1452659  162a73 bin/rcc
4407725    1568    4896 4414189  435aed bin/qmake

After:
   text    data     bss     dec     hex filename
1131655    6520    3494 1141669  116ba5 bin/moc
1027043    5480    1766 1034289   fc831 bin/rcc
3578489    1656    5313 3585458  36b5b2 bin/qmake

Gain: 35% on moc, 28% on rcc, 19% on qmake

Before (on OS X):
__TEXT	__DATA	__OBJC	others	dec	hex
1495040	12288	0	4294993008	4296500336	100176470	bin/moc
1265664	8192	0	4294983904	4296257760	10013b0e0	bin/rcc
5279744	81920	0	4297912320	4303273984	1007ec000	bin/qmake

After:
__TEXT	__DATA	__OBJC	others	dec	hex
806912	8192	0	4294988132	4295803236	1000cc164	bin/moc
720896	8192	0	4294979764	4295708852	1000b50b4	bin/rcc
4841472	77824	0	4295580688	4300499984	100546c10	bin/qmake

Gain: 46% on moc, 43% on rcc, 8% on qmake.

Change-Id: Icc7cdc9fd6f5db15537b4adabaac7e7a27e539d4
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
This commit is contained in:
Thiago Macieira 2014-05-06 11:27:06 -07:00 committed by The Qt Project
parent e91e502ab6
commit 6315745770
6 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
configure vendored
View File

@ -3664,7 +3664,7 @@ if true; then ###[ '!' -f "$outpath/bin/qmake" ];
EXTRA_SRCS=
EXTRA_CFLAGS="\$(QMAKE_CFLAGS) \$(QMAKE_CFLAGS_SPLIT_SECTIONS)"
EXTRA_CXXFLAGS="\$(QMAKE_CXXFLAGS) \$(QMAKE_CXXFLAGS_SPLIT_SECTIONS)"
EXTRA_LFLAGS="\$(QMAKE_LFLAGS)"
EXTRA_LFLAGS="\$(QMAKE_LFLAGS) \$(QMAKE_LFLAGS_GCSECTIONS)"
if [ "$PLATFORM" = "irix-cc" ] || [ "$PLATFORM" = "irix-cc-64" ]; then
EXTRA_LFLAGS="$EXTRA_LFLAGS -lm"
@ -3678,6 +3678,7 @@ if true; then ###[ '!' -f "$outpath/bin/qmake" ];
setBootstrapVariable QMAKE_CXXFLAGS
setBootstrapVariable QMAKE_CXXFLAGS_SPLIT_SECTIONS
setBootstrapVariable QMAKE_LFLAGS
setBootstrapVariable QMAKE_LFLAGS_GCSECTIONS
if [ "$CFG_RELEASE_QMAKE" = "yes" ]; then
setBootstrapVariable QMAKE_CFLAGS_RELEASE

1
mkspecs/common/linux.conf
View File

@ -6,6 +6,7 @@ QMAKE_PLATFORM += linux
QMAKE_CFLAGS_THREAD += -D_REENTRANT
QMAKE_CXXFLAGS_THREAD += $$QMAKE_CFLAGS_THREAD
QMAKE_LFLAGS_GCSECTIONS = -Wl,--gc-sections
QMAKE_INCDIR =
QMAKE_LIBDIR =

1
mkspecs/common/mac.conf
View File

@ -18,6 +18,7 @@ QMAKE_INCDIR_OPENGL = \
QMAKE_FIX_RPATH = install_name_tool -id
QMAKE_LFLAGS_RPATH =
QMAKE_LFLAGS_GCSECTIONS = -Wl,-dead_strip
QMAKE_LIBS_DYNLOAD =
QMAKE_LIBS_OPENGL = -framework OpenGL -framework AGL

3
mkspecs/features/qt_app.prf
View File

@ -16,6 +16,9 @@ DESTDIR = $$MODULE_BASE_OUTDIR/bin
isEmpty(QMAKE_INFO_PLIST): CONFIG -= app_bundle
# This decreases the binary size for tools if statically linked
QMAKE_LFLAGS += $$QMAKE_LFLAGS_GCSECTIONS
host_build: QT -= gui # no host tool will ever use gui
host_build:force_bootstrap {
!build_pass: CONFIG += release

1
mkspecs/win32-g++/qmake.conf
View File

@ -77,6 +77,7 @@ QMAKE_LFLAGS_CONSOLE = -Wl,-subsystem,console
QMAKE_LFLAGS_WINDOWS = -Wl,-subsystem,windows
QMAKE_LFLAGS_DLL = -shared
QMAKE_LFLAGS_CXX11 =
QMAKE_LFLAGS_GCSECTIONS = -Wl,--gc-sections
QMAKE_LINK_OBJECT_MAX = 10
QMAKE_LINK_OBJECT_SCRIPT = object_script
QMAKE_PREFIX_STATICLIB = lib

1
tools/configure/configureapp.cpp
View File

@ -4041,6 +4041,7 @@ void Configure::buildQmake()
stream << "QMAKESPEC = $(SOURCE_PATH)\\mkspecs\\win32-g++" << endl
<< "EXTRA_CFLAGS = -DUNICODE -ffunction-sections" << endl
<< "EXTRA_CXXFLAGS = -DUNICODE -ffunction-sections" << endl
<< "EXTRA_LFLAGS = -Wl,--gc-sections" << endl
<< "QTOBJS = qfilesystemengine_win.o \\" << endl
<< " qfilesystemiterator_win.o \\" << endl
<< " qfsfileengine_win.o \\" << endl