compiler-rt-libc-*-dev not available in nixpkgs cc toolchain

[iphydf]

Describe the bug
#include <sanitizer/msan_interface.h> fails to compile on bazel with nixpkgs. It works with clang++.

To Reproduce
Create a C file with #include <sanitizer/msan_interface.h> in it. Observe:

myfile.c:1:10: fatal error: 'sanitizer/msan_interface.h' file not found

Expected behavior
It should compile.

Environment

• OS name + version: NixOS 23.05
• Version of the code: v0.10.0

Additional context
The include directory is known to clang++:

[nix-shell:/src/workspace]$ clang++ -c -xc++ - -v
...
 /nix/store/l4mfdpx5d4ybn6ki1gjhlcmz6hv5p6kh-compiler-rt-libc-16.0.1-dev/include
...

[avdv]

Hi.

I think you should be able to use the library like any other, e.g. with

nixpkgs_package(
    name = "compiler-rt-libc",
    attribute_path = "llvmPackages_16.compiler-rt-libc",
    nix_file_content = """import <nixpkgs> { }""",
    repository = "@nixpkgs",
)

nixpkgs_package(
    name = "compiler-rt-libc.dev",
    attribute_path = "llvmPackages_16.compiler-rt-libc.dev",
    build_file_content = """\
load("@rules_cc//cc:defs.bzl", "cc_library")
filegroup(
    name = "include",
    srcs = glob(["include/**/*.h"]),
    visibility = ["//visibility:public"],
)
cc_library(
    name = "compiler-rt-libc",
    srcs = ["@compiler-rt-libc//:lib"],
    hdrs = [":include"],
    strip_include_prefix = "include",
    visibility = ["//visibility:public"],
)
""",
    nix_file_content = """import <nixpkgs> { }""",
    repository = "@nixpkgs",
)

[iphydf]

The problem is that Go stdlib uses that (when compiling with msan) but doesn't declare it, because it's assumed to be part of the toolchain. Same with absl and probably other third party dependencies.

[iphydf]

Also absl-cpp uses it. I can't easily change their code to use the nixpkgs import (can I?).

[malt3]

Also absl-cpp uses it. I can't easily change their code to use the nixpkgs import (can I?).

You could probably patch the BUILD files of absl-cpp, but I see how this is not ideal.
Do you have any pointers for other llvm toolchains (in particular where they add compilter-rt-libc-*-dev as part of the toolchain)?