diff options
Diffstat (limited to 'm4/stdalign.m4')
| -rw-r--r-- | m4/stdalign.m4 | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/m4/stdalign.m4 b/m4/stdalign.m4 new file mode 100644 index 00000000..9752ba56 --- /dev/null +++ b/m4/stdalign.m4 @@ -0,0 +1,37 @@ +# Check for stdalign.h that conforms to C11. + +dnl Copyright 2011-2012 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +# Prepare for substituting <stdalign.h> if it is not supported. + +AC_DEFUN([gl_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); + + /* 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 $gl_cv_header_working_stdalign_h = yes; then + STDALIGN_H='' + else + STDALIGN_H='stdalign.h' + fi + + AC_SUBST([STDALIGN_H]) + AM_CONDITIONAL([GL_GENERATE_STDALIGN_H], [test -n "$STDALIGN_H"]) +]) |