apply IWYU include workaround to cfg tests

Author: firewave

.github/workflows/iwyu.yml

@@ -148,13 +148,15 @@ jobs:
           # TODO: remove -stdlib= - it should have been taken from the compilation database
           iwyu_tool -p cmake.output -j $(nproc) -- -w -Xiwyu --max_line_length=1024 -Xiwyu --comment_style=long -Xiwyu --quoted_includes_first -Xiwyu --update_comments -stdlib=${{ matrix.stdlib }} ${{ matrix.mapping_file_opt }} ${{ matrix.clang_inc }} > iwyu.log
 
+      # TODO: run with all configurations
       - name: test/cfg
         if: matrix.stdlib == 'libstdc++'
         run: |
           # TODO: redirect to log
           ./test/cfg/runtests.sh
         env:
           IWYU: include-what-you-use
+          IWYU_CLANG_INC: ${{ matrix.clang_inc }}
 
       - uses: actions/upload-artifact@v4
         if: success() || failure()

test/cfg/runtests.sh

@@ -67,7 +67,7 @@ function get_pkg_config_cflags {
 
 function iwyu_run {
     # TODO: convert -I includes provided by pkg-config to -isystem so IWYU does not produce warnings for system headers
-    ${IWYU} "${IWYU_OPTS[@]}" "$@"
+    ${IWYU} "${IWYU_OPTS[@]}" "${IWYU_CLANG_INC}"" "$@"
 }
 
 function cc_syntax {