tree aa5c3eace1891cb5bdbcc8461e7b08b30482b9d9
parent 4baccd115985fa81e6395dc60d5a44c45580f565
author Paula Toth <paulatoth@google.com> 1590049267 -0700
committer Copybara-Service <copybara-worker@google.com> 1598822281 -0700

[libc] Fix accidental inclusion of system libc headers.

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

GitOrigin-RevId: b2a485e37edf6415701c472d93afa7fa26dbcccb