From e91e502ab6424be12c3448431a65e7d617ab5571 Mon Sep 17 00:00:00 2001 From: Thiago Macieira Date: Sun, 11 May 2014 17:43:51 -0700 Subject: Make qmake also use -ffunction-sections This might lead to a smaller binary if we use --gc-sections too. Change-Id: I7e17b956a85ecefc3e187054848393d2855152b6 Reviewed-by: Oswald Buddenhagen --- tools/configure/configureapp.cpp | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'tools') diff --git a/tools/configure/configureapp.cpp b/tools/configure/configureapp.cpp index 06f78b1116..0e3bbcd3fb 100644 --- a/tools/configure/configureapp.cpp +++ b/tools/configure/configureapp.cpp @@ -4039,8 +4039,8 @@ void Configure::buildQmake() stream << "QT_VERSION = " << dictionary["VERSION"] << endl; if (dictionary[ "QMAKESPEC" ] == QString("win32-g++")) { stream << "QMAKESPEC = $(SOURCE_PATH)\\mkspecs\\win32-g++" << endl - << "EXTRA_CFLAGS = -DUNICODE" << endl - << "EXTRA_CXXFLAGS = -DUNICODE" << endl + << "EXTRA_CFLAGS = -DUNICODE -ffunction-sections" << endl + << "EXTRA_CXXFLAGS = -DUNICODE -ffunction-sections" << endl << "QTOBJS = qfilesystemengine_win.o \\" << endl << " qfilesystemiterator_win.o \\" << endl << " qfsfileengine_win.o \\" << endl -- cgit v1.2.3 From 6315745770384490509cf471c6286a1ea32cb79e Mon Sep 17 00:00:00 2001 From: Thiago Macieira Date: Tue, 6 May 2014 11:27:06 -0700 Subject: Strip bootstrapped binaries of unused sections 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 --- tools/configure/configureapp.cpp | 1 + 1 file changed, 1 insertion(+) (limited to 'tools') diff --git a/tools/configure/configureapp.cpp b/tools/configure/configureapp.cpp index 0e3bbcd3fb..b7565093f1 100644 --- a/tools/configure/configureapp.cpp +++ b/tools/configure/configureapp.cpp @@ -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 -- cgit v1.2.3