Add optional linker flag icf={safe,all} to optimizations #20
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Identical code folding folds identical functions into a single copy, saving disk space. Generally useful for large C++ applications. Only the gold linker can handle icf when using the gcc toolchain, although icf is generally superior when using llvm/lld. Additionally, fix a thinko where runpath wasn't being filtered from cflags/cxxflags.
Recommended in combination with ICF when using GCC toolchain, otherwise not recommended. However, there may be a use for it so leave it as a seperate option.
JoshStrobl
approved these changes
Sep 5, 2021
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Identical code folding folds identical functions into a single copy, saving disk space.
Generally useful for large C++ applications.
Only the gold linker can handle icf when using the gcc toolchain, although icf is generally superior when using llvm/lld.
Also add support for function-sections, this is recommended for use with ICF when using gcc/gold but not strictly necessary.
icf-all is not recommended for gcc/gold but is left as an option. icf-all is generally safe for clang/lld due to -faddrsig being default in clang.
Additionally, fix a thinko where runpath wasn't being filtered from cflags/cxxflags.