Remove -U_FORTIFY_SOURCE when thin_lto is enabled #15007
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Clang does not accept `-U` flags when doing lto backend actions: ``` clang: error: argument unused during compilation: '-U _FORTIFY_SOURCE' [-Werror,-Wunused-command-line-argument] ``` This isn't a problem for `-D` flags because of a special case: https://github.com/llvm/llvm-project/blob/10e99eb7e4adbb8e2407e2f6ae3d2e6420d060c9/clang/lib/Driver/ToolChains/Clang.cpp#L5579-L5582
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Clang does not accept `-U` flags when doing lto backend actions: ``` clang: error: argument unused during compilation: '-U _FORTIFY_SOURCE' [-Werror,-Wunused-command-line-argument] ``` This isn't a problem for `-D` flags because of a special case: https://github.com/llvm/llvm-project/blob/10e99eb7e4adbb8e2407e2f6ae3d2e6420d060c9/clang/lib/Driver/ToolChains/Clang.cpp#L5579-L5582 Closes #15007. PiperOrigin-RevId: 440314037 Co-authored-by: Keith Smiley <keithbsmiley@gmail.com>
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Clang does not accept
-Uflags when doing lto backend actions:This isn't a problem for
-Dflags because of a special case:https://github.com/llvm/llvm-project/blob/10e99eb7e4adbb8e2407e2f6ae3d2e6420d060c9/clang/lib/Driver/ToolChains/Clang.cpp#L5579-L5582