On Solaris 10, the configuration aborts:
$ ../configure
...
checking for raise... yes
checking for sigprocmask...
../configure: test: argument expected
The reason is that gl_cv_func_sigprocmask_v16 is not set in the statement
if test $gl_cv_func_sigprocmask_v16 != yes; then
(signalblocking.m4 line 28).
Why? Because the Solaris /bin/sh, unlike other shells, does redirected
compound statements in a subshell.
/bin/sh -c '{ gl_foo=yes; } 6>/dev/null; echo $gl_foo'
produces 'yes' on most platforms, but empty output on Solaris 10.
This patch fixes it.
2020-09-17 Bruno Haible <br...@clisp.org>
sigprocmask: Fix configuration failure on Solaris 10 (regr. 2020-07-25).
* m4/gnulib-common.m4 (GL_TMP_FD): New macro.
(gl_SILENT): Use 'exec', not a compound statement, to redirect
AS_MESSAGE_FD.
diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4
index 33e56fa..35be4d3 100644
--- a/m4/gnulib-common.m4
+++ b/m4/gnulib-common.m4
@@ -1,4 +1,4 @@
-# gnulib-common.m4 serial 57
+# gnulib-common.m4 serial 58
dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -630,13 +630,18 @@ AC_DEFUN([gl_BIGENDIAN],
AC_C_BIGENDIAN
])
+# A temporary file descriptor.
+# Must be less than 10, because dash 0.5.8 does not support redirections
+# with multi-digit file descriptors.
+m4_define([GL_TMP_FD], 9)
+
# gl_SILENT(command)
# executes command, but without the normal configure output.
AC_DEFUN([gl_SILENT],
[
- {
- $1
- } AS_MESSAGE_FD>/dev/null
+ exec GL_TMP_FD>&AS_MESSAGE_FD AS_MESSAGE_FD>/dev/null
+ $1
+ exec AS_MESSAGE_FD>&GL_TMP_FD AS_MESSAGE_FD>&-
])
# gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
