From 7f495b9848265b93e4365f1bcc8bc1a318cdb4ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Fri, 11 Mar 2016 13:33:43 -0500
Subject: [PATCH] build-sys: add check that our headers are ANSI compatible

---
 Makefile.am | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index 9cee98ec5a..0f1f79e62d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -6161,7 +6161,6 @@ DISTCHECK_CONFIGURE_FLAGS += \
 endif
 
 .PHONY: dist-check-help
-
 dist-check-help: $(rootbin_PROGRAMS) $(bin_PROGRAMS)
 	for i in $(abspath $^); do                                             \
             if $$i  --help | grep -v 'default:' | grep -E -q '.{80}.' ; then   \
@@ -6170,6 +6169,18 @@ dist-check-help: $(rootbin_PROGRAMS) $(bin_PROGRAMS)
 	        exit 1;                                                        \
             fi; done
 
+include_compilers = "$(CC)" "$(CC) -ansi" "$(CC) -std=iso9899:1990"
+public_headers = $(filter-out src/systemd/_sd-common.h, $(pkginclude_HEADERS) $(include_HEADERS))
+.PHONY: dist-check-includes
+dist-check-includes: $(public_headers)
+	@res=0;                                                        	        \
+	for i in $(abspath $^); do	                                        \
+	    for cc in $(include_compilers); do                                  \
+	        echo "$$cc -o/dev/null -c -x c -include "$$i" - </dev/null";    \
+	        $$cc -o/dev/null -c -x c -include "$$i" - </dev/null || res=1;  \
+	    done;                                                               \
+	done; exit $$res
+
 .PHONY: hwdb-update
 hwdb-update:
 	( cd $(top_srcdir)/hwdb && \