Summary: I found that because `--system-headers` flag was not included when running clang-tidy, errors produced from compiler provided headers were being suppressed. After passing this flag I realized that by including headers like stdint.h we were indirectly including headers from the system libc. To prevent this we pass `-ffreestanding`. We don't want to pass `--system-headers` for all checks just the `llvmlibc-restrict-system-libc-headers` therefore we do a separate invocation of clang-tidy for this check. Reviewers: abrachet, sivachandra Reviewed By: sivachandra Subscribers: mgorny, aheejin, tschuett, ecnelises, libc-commits Tags: #libc-project Differential Revision: https://reviews.llvm.org/D80178
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