Commits on Jan 10, 2023

1. build-support/cc-wrapper: pass in non-existent --sysroot= to untangle… …

   … from libc
   
   I would like to add an extra `gcc` build step during linux bootstrap
   (NixOS#208412). This makes it early
   bootstrap compiler linked and targeted against `bootstrapTools` `glibc`
   including it's headers.
   
   Without this change `gcc`'s spec files always prefer `bootstrapTools` `glibc`
   for header search path (passed in as --with-native-system-header-dir=). We'can't
   override it with:
   
   - `-I` option as it gets stacked before gcc-specific headers, we need to keep
     glibc headers after gcc as gcc cleans namespace up for C standard by using
     #include_next and by undefining system macros.
   - `-idirafter` option as it gets appended after existing `glibc`-includes
   
   This `--sysroot=/nix/store/does/not/exist` hack allows us to remove existing
   `glibc` headers and add new ones with `-idirafter`.
   
   We use `cc-cflags-before` instead of `libc-cflags` to allow user to define
   their own `--sysroot=` (like `firefox` does).
   
   To keep it working prerequisite cross-symlink in gcc.libs is required:
   NixOS#209153

   

   trofi committed Jan 10, 2023
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