Skip to content

cc-wrapper: adding a cc-wrapper-hook to the cc-wrapper #197937

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
Ericson2314 merged 1 commit into from
Oct 28, 2022
Merged

cc-wrapper: adding a cc-wrapper-hook to the cc-wrapper #197937

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 7 additions & 0 deletions doc/stdenv/stdenv.chapter.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1140,6 +1140,13 @@ Here are some more packages that provide a setup hook. Since the list of hooks i
Many other packages provide hooks, that are not part of `stdenv`. You can find
these in the [Hooks Reference](#chap-hooks).

### Compiler and Linker wrapper hooks {#compiler-linker-wrapper-hooks}

If the file `${cc}/nix-support/cc-wrapper-hook` exists, it will be run at the end of the [compiler wrapper](#cc-wrapper).
If the file `${binutils}/nix-support/post-link-hook` exists, it will be run at the end of the linker wrapper.
These hooks allow a user to inject code into the wrappers.
As an example, these hooks can be used to extract `extraBefore`, `params` and `extraAfter` which store all the command line arguments passed to the compiler and linker respectively.

## Purity in Nixpkgs {#sec-purity-in-nixpkgs}

*Measures taken to prevent dependencies on packages outside the store, and what you can do to prevent them.*
Expand Down
6 changes: 6 additions & 0 deletions pkgs/build-support/cc-wrapper/cc-wrapper.sh
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -219,6 +219,12 @@ fi
PATH="$path_backup"
# Old bash workaround, see above.

# if a cc-wrapper-hook exists, run it.
if [[ -e @out@/nix-support/cc-wrapper-hook ]]; then
compiler=@prog@
source @out@/nix-support/cc-wrapper-hook
fi

if (( "${NIX_CC_USE_RESPONSE_FILE:-@use_response_file_by_default@}" >= 1 )); then
exec @prog@ @<(printf "%q\n" \
${extraBefore+"${extraBefore[@]}"} \
Expand Down