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| author | Nikos Mavrogiannopoulos <nmav@gnutls.org> | 2012-01-27 22:08:40 +0100 |
|---|---|---|
| committer | Nikos Mavrogiannopoulos <nmav@gnutls.org> | 2012-01-27 22:08:40 +0100 |
| commit | 96a1ad7b7d57655f10433b05589a1d558197253b (patch) | |
| tree | 67ccd9a5b4c1ce58f199572f684d3397a8ba1369 /gl/m4/stdalign.m4 | |
| parent | 2216b3561d86cccb94af363590fd7a329fd013f5 (diff) | |
| download | gnutls-96a1ad7b7d57655f10433b05589a1d558197253b.tar.gz | |
added base64 module
Diffstat (limited to 'gl/m4/stdalign.m4')
| -rw-r--r-- | gl/m4/stdalign.m4 | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/gl/m4/stdalign.m4 b/gl/m4/stdalign.m4 index 9752ba568b..d78a589808 100644 --- a/gl/m4/stdalign.m4 +++ b/gl/m4/stdalign.m4 @@ -14,13 +14,26 @@ AC_DEFUN([gl_STDALIGN_H], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [[#include <stdalign.h> - int align_int = alignof (int) + _Alignof (double); + #include <stddef.h> + + /* Test that alignof yields a result consistent with offsetof. + This catches GCC bug 52023 + <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>. */ + #ifdef __cplusplus + template <class t> struct alignof_helper { char a; t b; }; + # define ao(type) offsetof (alignof_helper<type>, b) + #else + # define ao(type) offsetof (struct { char a; type b; }, b) + #endif + char test1[_Alignof (double) == ao (double) ? 1 : -1]; + char test2[alignof (long int) == ao (long int) ? 1 : -1]; /* Test _Alignas only on platforms where gnulib can help. */ #if \ (__GNUC__ || __IBMC__ || __IBMCPP__ \ || 0x5110 <= __SUNPRO_C || 1300 <= _MSC_VER) int alignas (8) alignas_int = 1; + char test3[8 <= _Alignof (alignas_int) ? 1 : -1]; #endif ]])], [gl_cv_header_working_stdalign_h=yes], |