| #! /bin/sh |
| # Copyright (C) 2003-2025 Free Software Foundation, Inc. |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 2, or (at your option) |
| # any later version. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program. If not, see <https://www.gnu.org/licenses/>. |
| |
| # Make sure aclocal does not overwrite aclocal.m4 needlessly. |
| # Also make sure automake --no-force does not overwrite Makefile.in needlessly. |
| |
| . test-init.sh |
| |
| cat >> configure.ac << 'END' |
| SOME_DEFS |
| AC_CONFIG_FILES([sub/Makefile]) |
| END |
| |
| mkdir sub |
| : > sub/Makefile.am |
| |
| cat >> Makefile.am << 'END' |
| SUBDIRS = sub |
| include fragment.inc |
| END |
| |
| : > fragment.inc |
| |
| mkdir m4 |
| echo 'AC_DEFUN([SOME_DEFS], [])' > m4/somedefs.m4 |
| |
| # Automake will take aclocal.m4 to be newer if it has the same timestamp |
| # as Makefile.in. Avoid the confusing by sleeping. |
| AUTOMAKE_after_aclocal () |
| { |
| $sleep |
| $AUTOMAKE --no-force |
| } |
| |
| # aclocal will rewrite aclocal.m4 unless the input files are all older than the |
| # existing aclocal.m4 -- sleep to ensure somedefs.m4 has an older timestamp |
| # than the aclocal.m4 that the next aclocal call will generate. |
| $sleep |
| |
| $ACLOCAL -I m4 |
| AUTOMAKE_after_aclocal |
| |
| touch foo |
| $sleep |
| $ACLOCAL -I m4 |
| AUTOMAKE_after_aclocal |
| # aclocal.m4 and Makefile.in should not have been updated, so 'foo' |
| # should be younger |
| is_newest foo aclocal.m4 Makefile.in sub/Makefile.in |
| |
| $sleep |
| $ACLOCAL -I m4 --force |
| is_newest aclocal.m4 foo |
| # We still use --no-force for automake, but since aclocal.m4 has |
| # changed all Makefile.ins should be updated. |
| AUTOMAKE_after_aclocal |
| is_newest Makefile.in aclocal.m4 foo |
| is_newest sub/Makefile.in aclocal.m4 foo |
| |
| $sleep |
| touch m4/somedefs.m4 |
| $sleep |
| $ACLOCAL -I m4 |
| AUTOMAKE_after_aclocal |
| # aclocal.m4 should have been updated, although its contents haven't |
| # changed. |
| is_newest aclocal.m4 m4/somedefs.m4 |
| is_newest Makefile.in m4/somedefs.m4 |
| is_newest sub/Makefile.in m4/somedefs.m4 |
| |
| $sleep |
| touch fragment.inc |
| $sleep |
| $ACLOCAL -I m4 |
| AUTOMAKE_after_aclocal |
| # Only ./Makefile.in should change. |
| is_newest Makefile.in fragment.inc |
| is_newest fragment.inc aclocal.m4 |
| is_newest fragment.inc sub/Makefile.in |
| |
| grep README Makefile.in && exit 1 |
| |
| $sleep |
| : > README |
| $sleep |
| $AUTOMAKE --no-force |
| # Even if no dependency change, the content changed. |
| is_newest Makefile.in README |
| is_newest README sub/Makefile.in |
| |
| grep README Makefile.in |
| |
| : > sub/Makefile.in |
| $sleep |
| touch foo |
| $sleep |
| $ACLOCAL -I m4 |
| $AUTOMAKE --no-force |
| # Only sub/Makefile.in should change. |
| is_newest foo aclocal.m4 |
| is_newest foo Makefile.in |
| is_newest sub/Makefile.in foo |
| |
| : |
