On Haiku, I'm seeing this configure output: ... checking for posix_spawn... yes checking whether posix_spawn works... cmp: EOF on conftest.ok no checking for ptrdiff_t... yes ...
This patch should avoid the spurious message. 'cmp' is required by POSIX to emit a diagnostics to stderr, even when nothing is wrong with the two argument files: <http://pubs.opengroup.org/onlinepubs/9699919799/utilities/cmp.html>. Yuck. 2017-10-28 Bruno Haible <br...@clisp.org> posix_spawn: Avoid spurious message in configure output. * m4/posix_spawn.m4 (gl_POSIX_SPAWN_WORKS): Discard stderr output from 'cmp' command. diff --git a/m4/posix_spawn.m4 b/m4/posix_spawn.m4 index 47a6147..d7d1c86 100644 --- a/m4/posix_spawn.m4 +++ b/m4/posix_spawn.m4 @@ -1,4 +1,4 @@ -# posix_spawn.m4 serial 13 +# posix_spawn.m4 serial 14 dnl Copyright (C) 2008-2017 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -224,7 +224,7 @@ main () [if test -s conftest$ac_exeext \ && ./conftest$ac_exeext > conftest.out \ && echo 'This should be seen only once.' > conftest.ok \ - && cmp conftest.out conftest.ok > /dev/null; then + && cmp conftest.out conftest.ok >/dev/null 2>&1; then gl_cv_func_posix_spawn_works=yes else gl_cv_func_posix_spawn_works=no
