Mercurial > hg > octave-shane > gnulib-hg
changeset 16140:7fae013a2fd6
stdalign: port to Clang 3.0
Problem reported by Simon Josefsson in
<http://lists.gnu.org/archive/html/bug-gnulib/2011-12/msg00005.html>.
* doc/posix-headers/stdalign.texi (stdalign.h): Mention Clang 3.0,
which has <stdalign.h> but which does not define alignof.
* m4/stdalign.m4 (gl_STDALIGN_H): Check for Clang 3.0's problem.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Fri, 02 Dec 2011 01:34:53 -0800 |
| parents | e4bb630139e4 |
| children | 39ebdfb411b2 |
| files | ChangeLog doc/posix-headers/stdalign.texi m4/stdalign.m4 |
| diffstat | 3 files changed, 28 insertions(+), 2 deletions(-) [+] |
line wrap: on
line diff
--- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,12 @@ +2011-12-02 Paul Eggert <eggert@cs.ucla.edu> + + stdalign: port to Clang 3.0 + Problem reported by Simon Josefsson in + <http://lists.gnu.org/archive/html/bug-gnulib/2011-12/msg00005.html>. + * doc/posix-headers/stdalign.texi (stdalign.h): Mention Clang 3.0, + which has <stdalign.h> but which does not define alignof. + * m4/stdalign.m4 (gl_STDALIGN_H): Check for Clang 3.0's problem. + 2011-12-01 Eric Blake <eblake@redhat.com> mktempd: silence dd usage
--- a/doc/posix-headers/stdalign.texi +++ b/doc/posix-headers/stdalign.texi @@ -13,6 +13,8 @@ @itemize @item This header file is missing on most circa-2011 platforms. +@item +Clang 3.0's @code{<stdalign.h>} does not define @code{alignof}/@code{_Alignof}. @end itemize Portability problems not fixed by Gnulib:
--- a/m4/stdalign.m4 +++ b/m4/stdalign.m4 @@ -9,9 +9,24 @@ AC_DEFUN([gl_STDALIGN_H], [ - AC_CHECK_HEADERS_ONCE([stdalign.h]) + AC_CACHE_CHECK([for working stdalign.h], + [gl_cv_header_working_stdalign_h], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdalign.h> + int align_int = alignof (int) + _Alignof (double); - if test $ac_cv_header_stdalign_h = yes; then + /* 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; + #endif + ]])], + [gl_cv_header_working_stdalign_h=yes], + [gl_cv_header_working_stdalign_h=no])]) + + if test $gl_cv_header_working_stdalign_h = yes; then STDALIGN_H='' else STDALIGN_H='stdalign.h'