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Merge pull request #197937 from danielbarter/cc-wrapper-hook

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cc-wrapper: adding a cc-wrapper-hook to the cc-wrapper
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John Ericson 2022-10-28 17:30:03 +01:00 committed by GitHub
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7
doc/stdenv/stdenv.chapter.md
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@ -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.*

6
pkgs/build-support/cc-wrapper/cc-wrapper.sh
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@ -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[@]}"} \