From dd76a35f11a6c0d08e9c3721fde346cc27192451 Mon Sep 17 00:00:00 2001
From: Matt Staveley-Taylor <matt.stav.taylor@gmail.com>
Date: Tue, 15 Oct 2024 02:14:41 +0200
Subject: [PATCH] ci: check public headers compile with c89 pedantic errors

---
 .github/workflows/ci.yml | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2aed69db9..040c098fe 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -53,6 +53,22 @@ jobs:
           - name: Build mlibc
             run: 'xbstrap install ${{matrix.builds}}'
             working-directory: build/
+          - name: Check public headers conform to C89/C99/C11
+            if: ${{matrix.builds == 'mlibc-headers-only'}}
+            working-directory: build/
+            run: |
+                GCC_ARCH="${{matrix.arch}}"
+                case "$GCC_ARCH" in
+                  "x86")
+                    GCC_ARCH="i686"
+                    ;;
+                esac
+                ALL_HDRS="packages/${{matrix.builds}}/usr/include/**.h"
+                GCC_ARGS="$GCC_ARCH-linux-mlibc-gcc -x c -S /dev/null -o /dev/null -I packages/${{matrix.builds}}/usr/include -I packages/linux-headers/usr/include -nostdlib"
+                # For C89, exclude complex.h, and -Wlong-long
+                printf -- '-include\0%s\0' $ALL_HDRS | sed 's/complex.h/stdio.h/' | xargs -0 $GCC_ARGS -std=c89 -Wno-long-long
+                printf -- '-include\0%s\0' $ALL_HDRS | xargs -0 $GCC_ARGS -std=c99
+                printf -- '-include\0%s\0' $ALL_HDRS | xargs -0 $GCC_ARGS -std=c11
           - name: Test mlibc
             run: 'meson test -v -C pkg-builds/${{matrix.builds}}'
             working-directory: build/