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| author | Paul Eggert <eggert@cs.ucla.edu> | 2011-10-16 16:56:59 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2011-10-27 13:05:41 -0700 |
| commit | 6dc2ffa573d23caeeb62c4ba3b9a630a1261e35d (patch) | |
| tree | b2ab3e3ae38b6c75782d1617c71fae4b7609f950 /m4/stdalign.m4 | |
| parent | 3cab861e90cc830e108af9581884e26b3c45ce21 (diff) | |
| download | gnulib-6dc2ffa573d23caeeb62c4ba3b9a630a1261e35d.tar.gz | |
stdalign: new module
* doc/posix-headers/stdalign.texi, lib/stdalign.in.h, m4/stdalign.m4:
* modules/stdalign: New files.
* MODULES.html.sh (c1x_core_properties): Add stdalign.
* doc/gnulib.texi (Header File Substitutes): Add stdalign.
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 0000000000..d90cee3756 --- /dev/null +++ b/m4/stdalign.m4 @@ -0,0 +1,37 @@ +# Check for stdalign.h that conforms to C1x. + +dnl Copyright 2011 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_CHECK_HEADERS_ONCE([stdalign.h]) + HAVE_ATTRIBUTE_ALIGNED='?' + + if test "$ac_cv_header_stdalign_h" = yes; then + STDALIGN_H='' + else + STDALIGN_H='stdalign.h' + AC_CACHE_CHECK([for __attribute__ ((__aligned__ (expr)))], + [gl_cv_attribute_aligned], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[char __attribute__ ((__aligned__ (1 << 3))) c;]], + [[]])], + [gl_cv_attribute_aligned=yes], + [gl_cv_attribute_aligned=no])]) + if test $gl_cv_attribute_aligned = yes; then + HAVE_ATTRIBUTE_ALIGNED=1 + else + HAVE_ATTRIBUTE_ALIGNED=0 + fi + fi + + AC_SUBST([HAVE_ATTRIBUTE_ALIGNED]) + AC_SUBST([STDALIGN_H]) + AM_CONDITIONAL([GL_GENERATE_STDALIGN_H], [test -n "$STDALIGN_H"]) +]) |