1 files changed, 126 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/build-support/pkg-config-wrapper/default.nix b/nixpkgs/pkgs/build-support/pkg-config-wrapper/default.nix
new file mode 100644
index 000000000000..e01df107dd17
--- /dev/null
+++ b/nixpkgs/pkgs/build-support/pkg-config-wrapper/default.nix
@@ -0,0 +1,126 @@
+# The wrapper script ensures variables like PKG_CONFIG_PATH and
+# PKG_CONFIG_PATH_FOR_BUILD work properly.
+
+{ stdenvNoCC
+, buildPackages
+, pkg-config
+, baseBinName ? "pkg-config"
+, propagateDoc ? pkg-config != null && pkg-config ? man
+, extraPackages ? [], extraBuildCommands ? ""
+}:
+
+with stdenvNoCC.lib;
+
+let
+  stdenv = stdenvNoCC;
+  inherit (stdenv) hostPlatform targetPlatform;
+
+  # Prefix for binaries. Customarily ends with a dash separator.
+  #
+  # TODO(@Ericson2314) Make unconditional, or optional but always true by
+  # default.
+  targetPrefix = stdenv.lib.optionalString (targetPlatform != hostPlatform)
+                                        (targetPlatform.config + "-");
+
+  # See description in cc-wrapper.
+  suffixSalt = replaceStrings ["-" "."] ["_" "_"] targetPlatform.config;
+
+in
+
+stdenv.mkDerivation {
+  pname = targetPrefix + pkg-config.pname + "-wrapper";
+  inherit (pkg-config) version;
+
+  preferLocalBuild = true;
+
+  shell = getBin stdenvNoCC.shell + stdenvNoCC.shell.shellPath or "";
+
+  inherit targetPrefix suffixSalt baseBinName;
+
+  outputs = [ "out" ] ++ optionals propagateDoc ([ "man" ] ++ optional (pkg-config ? doc) "doc");
+
+  passthru = {
+    inherit pkg-config;
+  };
+
+  dontBuild = true;
+  dontConfigure = true;
+
+  unpackPhase = ''
+    src=$PWD
+  '';
+
+  installPhase =
+    ''
+      mkdir -p $out/bin $out/nix-support
+
+      wrap() {
+        local dst="$1"
+        local wrapper="$2"
+        export prog="$3"
+        substituteAll "$wrapper" "$out/bin/$dst"
+        chmod +x "$out/bin/$dst"
+      }
+
+      echo $pkg-config > $out/nix-support/orig-pkg-config
+
+      wrap ${targetPrefix}${baseBinName} ${./pkg-config-wrapper.sh} "${getBin pkg-config}/bin/${baseBinName}"
+    ''
+    # symlink in share for autoconf to find macros
+
+    # TODO(@Ericson2314): in the future just make the unwrapped pkg-config a
+    # propagated dep once we can rely on downstream deps comming first in
+    # search paths. (https://github.com/NixOS/nixpkgs/pull/31414 took a crack
+    # at this.)
+    + ''
+      ln -s ${pkg-config}/share $out/share
+    '';
+
+  strictDeps = true;
+
+  wrapperName = "PKG_CONFIG_WRAPPER";
+
+  setupHooks = [
+    ../setup-hooks/role.bash
+    ./setup-hook.sh
+  ];
+
+  postFixup =
+    ##
+    ## User env support
+    ##
+
+    # Propagate the underling unwrapped pkg-config so that if you
+    # install the wrapper, you get anything else it might provide.
+    ''
+      printWords ${pkg-config} > $out/nix-support/propagated-user-env-packages
+    ''
+
+    ##
+    ## Man page and doc support
+    ##
+    + optionalString propagateDoc (''
+      ln -s ${pkg-config.man} $man
+    '' + optionalString (pkg-config ? doc) ''
+      ln -s ${pkg-config.doc} $doc
+    '')
+
+    + ''
+      substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
+      substituteAll ${../wrapper-common/utils.bash} $out/nix-support/utils.bash
+    ''
+
+    ##
+    ## Extra custom steps
+    ##
+    + extraBuildCommands;
+
+  meta =
+    let pkg-config_ = if pkg-config != null then pkg-config else {}; in
+    (if pkg-config_ ? meta then removeAttrs pkg-config.meta ["priority"] else {}) //
+    { description =
+        stdenv.lib.attrByPath ["meta" "description"] "pkg-config" pkg-config_
+        + " (wrapper script)";
+      priority = 10;
+  };
+}