While creating a testdir for the modules 'immutable', 'get-rusage-data', I get this warning:
configure.ac:672: warning: AC_REQUIRE: `gl_FUNC_MMAP_ANON' was expanded before it was required configure.ac:672: https://www.gnu.org/software/autoconf/manual/autoconf.html#Expanded-Before-Required glm4/mprotect.m4:14: gl_FUNC_MPROTECT_WORKS is expanded from... glm4/immutable.m4:7: gl_IMMUTABLE is expanded from... configure.ac:35: gl_INIT is expanded from... configure.ac:672: the top level The cause is that gl_FUNC_MMAP_ANON is invoked in some places and required in other places. This patch fixes it. 2021-01-17 Bruno Haible <br...@clisp.org> immutable, get-rusage-data: Fix autoconf warning. * m4/mmap-anon.m4 (gl_FUNC_MMAP_ANON): Define through AC_DEFUN_ONCE. diff --git a/m4/mmap-anon.m4 b/m4/mmap-anon.m4 index 5a9f968..e47aa2d 100644 --- a/m4/mmap-anon.m4 +++ b/m4/mmap-anon.m4 @@ -1,4 +1,4 @@ -# mmap-anon.m4 serial 11 +# mmap-anon.m4 serial 12 dnl Copyright (C) 2005, 2007, 2009-2021 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -13,7 +13,7 @@ dnl with or without modifications, as long as this notice is preserved. # - On IRIX, neither exists, and a file descriptor opened to /dev/zero must be # used. -AC_DEFUN([gl_FUNC_MMAP_ANON], +AC_DEFUN_ONCE([gl_FUNC_MMAP_ANON], [ dnl Persuade glibc <sys/mman.h> to define MAP_ANONYMOUS. AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
