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# dbeeb136 02-Jan-2022 Markus Böck <[email protected]>

[clang][MinGW] Explicitly ignore `-fPIC` & friends

GCC on Windows ignores this flag completely [0] which some build systems sadly rely on when compiling for Windows using MinGW. The current behaviou

[clang][MinGW] Explicitly ignore `-fPIC` & friends

GCC on Windows ignores this flag completely [0] which some build systems sadly rely on when compiling for Windows using MinGW. The current behaviour of clang however is to error out as -fPIC & friends has no effect on Windows.

This patch instead changes the behaviour for MinGW to ignore the option for the sake of compatibility

Fixes https://github.com/llvm/llvm-project/issues/52947

[0] https://gcc.gnu.org/legacy-ml/gcc-patches/2015-08/msg00836.html

Differential Revision: https://reviews.llvm.org/D116485

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# d133dc22 26-Dec-2016 Saleem Abdulrasool <[email protected]>

Driver: warn on -fPIC/-fpic/-fPIE/-fpie on Windows

Use of these flags would result in the use of ELF-style PIE/PIC code
which is incorrect on Windows. Windows is inherently PIC by means of
the DLL

Driver: warn on -fPIC/-fpic/-fPIE/-fpie on Windows

Use of these flags would result in the use of ELF-style PIE/PIC code
which is incorrect on Windows. Windows is inherently PIC by means of
the DLL slide that occurs at load. This also mirrors the behaviour on
GCC for MinGW. Currently, the Windows x86_64 forces the relocation
model to PIC (Level 2). This is unchanged for now, though we should
remove any assumptions on that and change it to a static relocation
model.

llvm-svn: 290533

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