[PATCH] D158218: [CMake] Deprecate DEFAULT_SYSROOT and GCC_INSTALL_PREFIX

[Fangrui Song via Phabricator via cfe-commits]

MaskRay added inline comments.


================
Comment at: clang/CMakeLists.txt:179-183
+if(DEFAULT_SYSROOT)
+  message(WARNING "DEFAULT_SYSROOT is deprecated and will be removed. Use "
+    "configuration files (https://clang.llvm.org/docs/UsersManual.html#configuration-files)"
+    "to specify the default --sysroot=")
+endif()
----------------
bcain wrote:
> At one time I believe that the clang configuration files could not specify paths relative to the clang executable.  AFAICT `DEFAULT_SYSROOT` does support this.
> 
> But if I'm mistaken about that can we add an example to the docs at https://clang.llvm.org/docs/UsersManual.html#configuration-files illustrating how to use a relative sysroot?
Clang configuration files just complement user-specified command line options. As one can do `--sysroot=./sysroot`, one can add `--sysroot=./sysroot` to a configuration file, too.

If you think having a sysroot example is useful, I can add

```
# Relative --sysroot
--sysroot=./sysroot
```
before
clang/docs/UsersManual.rst:1018 `-c --target=x86_64-unknown-linux-gnu`


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D158218