From e527cccb63339aa955c99eed3b8cc55c464ed993 Mon Sep 17 00:00:00 2001
From: Joel Rosdahl <joel@rosdahl.net>
Date: Mon, 27 Apr 2015 20:17:14 +0200
Subject: [PATCH] c99: Check for and require a C99-compatible compiler

---
 NEWS.txt     |  6 ++++++
 configure.ac |  7 +++++--
 system.h     | 17 +----------------
 3 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/NEWS.txt b/NEWS.txt
index 154277f6b..46d2a3343 100644
--- a/NEWS.txt
+++ b/NEWS.txt
@@ -5,6 +5,12 @@ ccache news
 Unreleased 3.3
 --------------
 
+Notes
+~~~~~
+
+- A C99-compatible compiler is now required to build ccache.
+
+
 New features and improvements
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/configure.ac b/configure.ac
index 988ac315f..a35fac08e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,7 +21,11 @@ AC_SUBST(include_dev_mk)
 AC_SUBST(test_suites)
 
 dnl Checks for programs.
-AC_PROG_CC
+AC_PROG_CC_C99
+if test "$ac_cv_prog_cc_c99" = no; then
+    AC_MSG_ERROR(cannot find a C99-compatible compiler)
+fi
+
 AC_PROG_CPP
 AC_PROG_INSTALL
 AC_PROG_RANLIB
@@ -41,7 +45,6 @@ fi
 
 AC_HEADER_DIRENT
 AC_HEADER_TIME
-AC_HEADER_STDBOOL
 AC_HEADER_SYS_WAIT
 
 AC_CHECK_TYPES(long long)
diff --git a/system.h b/system.h
index dd11f2e50..f22ece843 100644
--- a/system.h
+++ b/system.h
@@ -40,6 +40,7 @@
 #include <limits.h>
 #include <signal.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -72,20 +73,4 @@ extern char **environ;
   #define asprintf rpl_asprintf
 #endif
 
-#ifdef HAVE_STDBOOL_H
-#  include <stdbool.h>
-#else
-#  ifndef HAVE__BOOL
-#    ifdef __cplusplus
-typedef bool _Bool;
-#    else
-#      define _Bool signed char
-#    endif
-#  endif
-#  define bool _Bool
-#  define false 0
-#  define true 1
-#  define __bool_true_false_are_defined 1
-#endif
-
 #endif /* CCACHE_SYSTEM_H */
-- 
2.47.2