diff options
Diffstat (limited to 'm4/fp_check_alignment.m4')
| -rw-r--r-- | m4/fp_check_alignment.m4 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/m4/fp_check_alignment.m4 b/m4/fp_check_alignment.m4 new file mode 100644 index 0000000000..a000c42582 --- /dev/null +++ b/m4/fp_check_alignment.m4 @@ -0,0 +1,22 @@ +# FP_CHECK_ALIGNMENT(TYPE, [IGNORED], [INCLUDES = DEFAULT-INCLUDES]) +# ------------------------------------------------------------------ +# A variation of AC_CHECK_SIZEOF for computing the alignment restrictions of a +# given type. Defines ALIGNMENT_TYPE. +AC_DEFUN([FP_CHECK_ALIGNMENT], +[AS_LITERAL_IF(m4_translit([[$1]], [*], [p]), [], + [AC_FATAL([$0: requires literal arguments])])[]dnl +AC_CHECK_TYPE([$1], [], [], [$3])[]dnl +m4_pushdef([fp_Cache], [AS_TR_SH([fp_cv_alignment_$1])])[]dnl +AC_CACHE_CHECK([alignment of $1], [fp_Cache], +[if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then + FP_COMPUTE_INT([offsetof(struct { char c; $1 ty; },ty)], + [fp_Cache], + [AC_INCLUDES_DEFAULT([$3])], + [AC_MSG_ERROR([cannot compute alignment ($1) +See `config.log' for more details.], [77])]) +else + fp_Cache=0 +fi])[]dnl +AC_DEFINE_UNQUOTED(AS_TR_CPP(alignment_$1), $fp_Cache, [The alignment of a `$1'.])[]dnl +m4_popdef([fp_Cache])[]dnl +])# FP_CHECK_ALIGNMENT |