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OpenVR-AdvancedSettings-frame/build_scripts/qt/compilers/clang-gcc-common-switches.pri
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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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QMAKE_CXXFLAGS += -Wextra
QMAKE_CXXFLAGS += -Wshadow
QMAKE_CXXFLAGS += -Wold-style-cast
QMAKE_CXXFLAGS += -Wnon-virtual-dtor
QMAKE_CXXFLAGS += -Wcast-align -Wunused -Woverloaded-virtual -Wformat=2
QMAKE_CXXFLAGS += -Wdouble-promotion
# Enable Link Time Optimization
QMAKE_CXXFLAGS += -flto
# Clang LTO requires the gold linker instead of ld
QMAKE_LFLAGS += -flto -fuse-ld=gold