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OpenVR-AdvancedSettings-frame/build_scripts/qt/compilers/gcc.pri
T
Vasily f0e05bde25 Add link time optimization to clang/gcc builds
Using `-flto` on clang without using the gold linker produces the error:
```main.o: file not recognized: File format not recognized```
https://github.com/android/ndk/issues/242

`gold` seems to be faster than `ld`, and decently tested even in 2010:
https://stackoverflow.com/questions/3476093/replacing-ld-with-gold-any-experience

Qmake will still append `-Wl,-O1` even though higher optimization levels
are used. Removing this in order to keep the compile command as short as
possible, and to reduce weird issues down the line. Ref topic:
https://stackoverflow.com/questions/53384988/why-qmake-passes-wl-o1-to-gcc-when-linking-and-will-it-harm-lto
2020-04-12 00:52:31 +02:00

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GCC_VERSION = $$system("g++ -dumpversion")
greaterThan(GCC_VERSION, 6) {
message('g++' version is above 6. Using regular g++.)
}
else {
message('g++' version is not above 6. Attempting to use highest specific version.)
system(g++-7 --version) {
message('g++-7' found.)
QMAKE_CXX = g++-7
}
system(g++-8 --version) {
message('g++-8' found.)
QMAKE_CXX = g++-8
}
system(g++-9 --version) {
message('g++-9' found.)
QMAKE_CXX = g++-9
}
}
include(clang-gcc-common-switches.pri)
QMAKE_CXXFLAGS += -Wpedantic
QMAKE_CXXFLAGS += -Werror
# GCC only switches
QMAKE_CXXFLAGS += -Wduplicated-branches -Wduplicated-cond -Wlogical-op -Wrestrict -Wnull-dereference
# Sign conversion warns on auto generated Qt MOC files.
QMAKE_CXXFLAGS += -Wconversion -Wno-sign-conversion
QMAKE_CXXFLAGS += -Wzero-as-null-pointer-constant
# Qmake will append this even though higher optimization levels are used.
QMAKE_LFLAGS_RELEASE -= -Wl,-O1