From 7d6c171379b2a57a97f332a4e7fcd3135dcccb5b Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Wed, 17 Mar 2021 11:57:12 -0400
Subject: build: s/ -I/ -isystem/g in libraries' CFLAGS

This suppresses warnings in libraries' headers, like:

      CC       src/dodge_balls-game.o
    In file included from src/xml.h:24:0,
                     from src/game.c:28:
    /usr/include/SDL2/SDL_stdinc.h: In function ‘SDL_memset4’:
    /usr/include/SDL2/SDL_stdinc.h:382:5: warning: switch missing default case [-Wswitch-default]
         switch (dwords % 4)
         ^~~~~~
---
(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 2773d19..e43c092 100644
--- a/configure.ac
+++ b/configure.ac
@@ -109,10 +109,20 @@ done
 
 PKG_PROG_PKG_CONFIG()
 PKG_CHECK_MODULES([SDL], [sdl2])
+SDL_CFLAGS="$(printf ' %s' "${SDL_CFLAGS}" | \
+	sed 's/ -I/ -isystem/g;')"
 PKG_CHECK_MODULES([SDL_IMAGE], [SDL2_image])
+SDL_IMAGE_CFLAGS="$(printf ' %s' "${SDL_IMAGE_CFLAGS}" | \
+	sed 's/ -I/ -isystem/g;')"
 PKG_CHECK_MODULES([SDL_TTF], [SDL2_ttf])
+SDL_TTF_CFLAGS="$(printf ' %s' "${SDL_TTF_CFLAGS}" | \
+	sed 's/ -I/ -isystem/g;')"
 PKG_CHECK_MODULES([ZLIB], [zlib])
+ZLIB_CFLAGS="$(printf ' %s' "${ZLIB_CFLAGS}" | \
+	sed 's/ -I/ -isystem/g;')"
 PKG_CHECK_MODULES([EXPAT], [expat])
+EXPAT_CFLAGS="$(printf ' %s' "${EXPAT_CFLAGS}" | \
+	sed 's/ -I/ -isystem/g;')"
 
 AC_ARG_VAR([XCF2PNG], [path to xcf2png utility])
 AC_CHECK_PROGS([XCF2PNG], [xcf2png], [no])
--
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