Define libc_max_align_t for internal use

git-mirror · Apr 2, 2015 · 37d60d9 · 37d60d9
1 parent b763f6a
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,7 @@
+2015-04-02  Florian Weimer  <fweimer@redhat.com>
+
+	* include/libc-internal.h (libc_max_align_t): Define.
+
 2015-04-02  Andreas Schwab  <schwab@suse.de>
 
 	[BZ #16850]

diff --git a/include/libc-internal.h b/include/libc-internal.h
@@ -107,4 +107,13 @@ extern void __init_misc (int, char **, char **);
 #define DIAG_IGNORE_NEEDS_COMMENT(version, option)	\
   _Pragma (_DIAG_STR (GCC diagnostic ignored option))
 
+/* This mirrors the C11 max_align_t type provided by GCC, but it is
+   also available in C99 mode.  The aligned attributes are required
+   because some ABIs have reduced alignment requirements for struct
+   and union members.  */
+typedef struct {
+  long long ll __attribute__ ((__aligned__ (__alignof__ (long long))));
+  long double ld __attribute__ ((__aligned__ (__alignof__ (long double))));
+} libc_max_align_t;
+
 #endif /* _LIBC_INTERNAL  */