only use __attributes__ if compiling with gcc

Signed-off-by: Mattias Andrée <maandree@operamail.com>

2 files changed, 39 insertions, 1 deletions

diff --git a/include/assert.h b/include/assert.h
index 7f44222..e5a963d 100644
--- a/include/assert.h
+++ b/include/assert.h
@@ -20,6 +20,9 @@
 #include <slibc/version.h>
 
 
+#include <slibc/features.h>
+
+
 
 /* The `assert` macro shall be redefined according to the the
  * current state of `NDEBUF` each time <assert.h> is included. */
@@ -86,7 +89,7 @@ __USE_GNU
  * @param  line        The line in the source code whence the assertion was made
  * @param  func        The function in the source code whence the assertion was made
  */
-void __attribute__((noreturn, nonnull(3, 4, 5)))
+void __GCC_ONLY(__attribute__((noreturn, nonnull(3, 4, 5))))
 __assert_fail(const char* expression, int errnum, const char* file, int line, const char* func);
 
 
diff --git a/include/slibc/features.h b/include/slibc/features.h
new file mode 100644
index 0000000..a755f71
--- /dev/null
+++ b/include/slibc/features.h
@@ -0,0 +1,35 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _SLIBC_FEATURES_H
+#define _SLIBC_FEATURES_H
+
+
+
+/**
+ * Macro used to exclude code unless GCC is used.
+ */
+#if defined(__GNUC__)
+# define __GCC_ONLY(...)   __VA_ARGS__
+#else
+# define __GCC_ONLY(...)   /* ignore */
+#endif
+
+
+
+#endif
+