From 4e42f6ebf483452015c3d102c6ac45741fceb87b Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Wed, 16 Dec 2020 13:37:17 +0000
Subject: [PATCH] libcody: Fix build for older GCC versions
Before CWG DR 1955 the controlling expression for an #elif must be
syntactically correct, meaning this won't compile with C++11 compilers
such as gcc 4.8:
The solution is to define __has_include(X) as 0 for compilers that don't
support it.
The second problem is that when <source_location> is found, it is used
without the std:: qualification.
libcody/ChangeLog:
* internal.hh: Define fallback macros for __has_builtin and
__has_include. Use __has_builtin for __builtin_FILE and
__builtin_LINE. Define alias for std::source_location.
---
libcody/internal.hh | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/libcody/internal.hh b/libcody/internal.hh
index d744b564cda9..87673f566575 100644
--- a/libcody/internal.hh
+++ b/libcody/internal.hh
@@ -4,14 +4,23 @@
#include "cody.hh"
+#ifndef __has_builtin
+#define __has_builtin(X) 0
+#endif
+#ifndef __has_include
+#define __has_include(X) 0
+#endif
+
// C++
-#if __GNUC__ >= 10
+#if __has_builtin(__builtin_FILE) && __has_builtin(__builtin_LINE)
#define CODY_LOC_BUILTIN 1
-#elif !defined (__has_include)
#elif __has_include (<source_location>)
#include <source_location>
+#ifdef __cpp_lib_source_location
#define CODY_LOC_SOURCE 1
#endif
+#endif
+
// C
#include <cstdio>
@@ -44,6 +53,8 @@ public:
}
#if !CODY_LOC_BUILTIN && CODY_LOC_SOURCE
+ using source_location = std::source_location;
+
constexpr Location (source_location loc = source_location::current ())
: Location (loc.file (), loc.line ())
{
--
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