diff options
Diffstat (limited to 't/spy-double-colon.sh')
| -rw-r--r-- | t/spy-double-colon.sh | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/t/spy-double-colon.sh b/t/spy-double-colon.sh deleted file mode 100644 index ea4714850..000000000 --- a/t/spy-double-colon.sh +++ /dev/null @@ -1,106 +0,0 @@ -#! /bin/sh -# Copyright (C) 2003-2015 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 <http://www.gnu.org/licenses/>. - -# Check whether double colon rules work. The Unix V7 make manual -# mentions double-colon rules, but POSIX does not. They seem to be -# supported by all Make implementation as far as we can tell. This test -# case is a spy: we want to detect if there exist implementations where -# these do not work. We might use these rules to simplify the rebuild -# rules (instead of the $? hack). - -# Tom Tromey write: -# | In the distant past we used :: rules extensively. -# | Fran?ois convinced me to get rid of them: -# | -# | Thu Nov 23 18:02:38 1995 Tom Tromey <tromey@cambric> -# | [ ... ] -# | * subdirs.am: Removed "::" rules -# | * header.am, libraries.am, mans.am, texinfos.am, footer.am: -# | Removed "::" rules -# | * scripts.am, programs.am, libprograms.am: Removed "::" rules -# | -# | -# | I no longer remember the rationale for this. It may have only been a -# | belief that they were unportable. - -# On a related topic, the Autoconf manual has the following text: -# | 'VPATH' and double-colon rules -# | Any assignment to 'VPATH' causes Sun 'make' to only execute -# | the first set of double-colon rules. (This comment has been -# | here since 1994 and the context has been lost. It's probably -# | about SunOS 4. If you can reproduce this, please send us a -# | test case for illustration.) - -# We already know that overlapping ::-rule like -# -# a :: b -# echo rule1 >> $@ -# a :: c -# echo rule2 >> $@ -# a :: b c -# echo rule3 >> $@ -# -# do not work equally on all platforms. It seems that in all cases -# Make attempts to run all matching rules. However at least GNU Make, -# NetBSD Make, and FreeBSD Make will detect that $@ was updated by the -# first matching rule and skip remaining matches (with the above -# example that means that unless 'a' was declared PHONY, only "rule1" -# will be appended to 'a' if both b and c have changed). Other -# implementations like OSF1 Make and HP-UX Make do not perform such a -# check and execute all matching rules whatever they do ("rule1", -# "rule2", abd "rule3" will all be appended to 'a' if b and c have -# changed). - -# So it seems only non-overlapping ::-rule may be portable. This is -# what we check now. - -. test-init.sh - -cat >Makefile <<\EOF -a :: b - echo rule1 >> $@ -a :: c - echo rule2 >> $@ -EOF - -touch b c -$sleep -: > a -$MAKE -test x"$(cat a)" = x -$sleep -touch b -$MAKE -test "$(cat a)" = "rule1" -# Ensure a is strictly newer than b, so HP-UX make does not execute rule2. -$sleep -: > a -$sleep -touch c -$MAKE -test "$(cat a)" = "rule2" - -# Unfortunately, the following is not portable to FreeBSD/NetBSD/OpenBSD -# make, see explanation above. - -#: > a -#$sleep -#touch b c -#$MAKE -#grep rule1 a -#grep rule2 a - -: |