[PATCH v3 4/4] autoconf: prefer an unrolled loop for trivial AC_CHECK_FUNCS
Eric Blake <[email protected]>
| Newsgroups | gmane.comp.sysutils.autoconf.patches |
|---|---|
| Message-ID | <[email protected]> |
From: Paolo Bonzini <[email protected]> An unrolled loop avoids the cost of spawning sed in AS_TR_SH and AS_TR_CPP. Prefer it if there is nothing in the second and third argument of AC_CHECK_FUNCS and the first argument is a literal. * lib/autoconf/functions.m4 (AC_CHECK_FUNCS): Unroll loop if safe. (_AC_CHECK_FUNCS): Move basic implementation here. Signed-off-by: Paolo Bonzini <[email protected]> Message-Id: <[email protected]> [eblake: perform AC_CHECK_FUNCS_ONCE changes separately, use dnl to reduce generated blank lines] Signed-off-by: Eric Blake <[email protected]> --- lib/autoconf/functions.m4 | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4 index 76824a2..a227cd4 100644 --- a/lib/autoconf/functions.m4 +++ b/lib/autoconf/functions.m4 @@ -88,12 +88,17 @@ m4_define([_AH_CHECK_FUNC], # `break' to stop the search. AC_DEFUN([AC_CHECK_FUNCS], [m4_map_args_w([$1], [_AH_CHECK_FUNC(], [)])]dnl -[AS_FOR([AC_func], [ac_func], [$1], -[AC_CHECK_FUNC(AC_func, - [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_]AC_func)) $2], - [$3])dnl]) +[m4_if([$2$3]AS_LITERAL_IF([$1], [[yes]], [[no]]), [yes], + [m4_map_args_w([$1], [_$0(], [)])], + [AS_FOR([AC_func], [ac_func], [$1], [_$0(AC_func, [$2], [$3])])])dnl ])# AC_CHECK_FUNCS +m4_define([_AC_CHECK_FUNCS], +[AC_CHECK_FUNC([$1], + [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_]$1)) $2], + [$3])dnl +]) + # _AC_CHECK_FUNC_ONCE(FUNCTION) # ----------------------------- -- 2.7.4