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Brad King authored
Any `include_directories()` calls in toolchain files are used during our ABI detection step even though it does not include any system headers. Since commit 5990ecb7 (Compute implicit include directories from compiler output, 2018-12-07, v3.14.0-rc1~108^2), that check is also used to detect implicit include directories. Any `include_directories()` in a toolchain file are detected as implicit and later excluded from explicit specification on compiler command lines, thus breaking the purpose of the calls in the first place. Fix the implicit include directory detection step to avoid using paths from `include_directories()` calls in the toolchain file. Fixes: #19079
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