From 89004005168e7af583860225e8cc3cf08ac35b41 Mon Sep 17 00:00:00 2001
From: Yuxuan Shui <yshuiv7@gmail.com>
Date: Sun, 14 Apr 2019 03:45:04 +0100
Subject: [PATCH] build: check if std-predef.h exists

Fix build on FreeBSD / non-glibc systems

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
---
 meson.build    | 4 ++++
 src/compiler.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/meson.build b/meson.build
index ff25fab9..f8d5c841 100644
--- a/meson.build
+++ b/meson.build
@@ -49,6 +49,10 @@ endif
 
 add_global_arguments('-D_GNU_SOURCE', language: 'c')
 
+if cc.has_header('stdc-predef.h')
+	add_global_arguments('-DHAS_STDC_PREDEF_H', language: 'c')
+endif
+
 warns = [ 'all', 'extra', 'no-unused-parameter', 'nonnull', 'shadow', 'no-type-limits',
           'implicit-fallthrough', 'no-unknown-warning-option', 'no-missing-braces', 'conversion' ]
 foreach w : warns
diff --git a/src/compiler.h b/src/compiler.h
index e26736fb..153853bf 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -2,7 +2,9 @@
 // Copyright (c) 2018 Yuxuan Shui <yshuiv7@gmail.com>
 #pragma once
 
+#ifdef HAS_STDC_PREDEF_H
 #include <stdc-predef.h>
+#endif
 
 #define auto           __auto_type
 #define likely(x)      __builtin_expect(!!(x), 1)