From: "Junio C Hamano" <gits...@pobox.com>
Philip Oakley <philipoak...@iee.org> writes:
A 'make -n' dry-run is used as part of the /compat/vcbuild and
/contrib/buildsystems code. The commit ee9be06 (perl: detect new
files
in MakeMaker builds, 2012-07-27) was not aware of that dry-run usage
and thus would not execute the target.
Add a comment to the make file stating the issue and the available
solutions of either NO_PERL or a '+recipe'.
I am not sure what this patch is trying to achieve.
It was probably a bit of 'don't mess with working code', given that I'd
used the NO_PERL solution, rather 'document the issue'. The issue had me
stuck for a while. The possible use of '+' came later when driving down
through the Makefile manual.
If you are not touching what this Makefile actually does, then I
would imagine that you are running the "buildsystems code" that
actually drives 'make -n' with some "available solution" (perhaps
you are running 'make -n NO_PERL=NoThanks' or something like that)?
Then instead of a command like this that nobody would read in this
file, the same command can instead go there to explain what the
"workaround" (e.g. unusual-looking 'make -n NO_PERL=NoThanks') is
doing?
I suspect you mean by +recipe that you modify this makefile to make
such a workaround unnecessary? If that is the case, why isn't such
a change actually be done with this commit, instead of a comment?
Yes. See above about the lack of 'fearless coding'; been working in
real world engineering too long ;-)
I am not sure what this patch is trying to achieve.
Puzzled...
Signed-off-by: Philip Oakley <philipoak...@iee.org>
---
Makefile | 3 +++
1 file changed, 3 insertions(+)
diff --git a/Makefile b/Makefile
index 149f1c7..22108bb 100644
--- a/Makefile
+++ b/Makefile
@@ -1746,6 +1746,9 @@ $(SCRIPT_PERL_GEN): perl/perl.mak
perl/perl.mak: perl/PM.stamp
+# 'make -n' (dry-run) will not execute this target which
creates/updates the PM.stamp file.
+# To avoid the error of failing to find the target PM.stamp, either
use NO_PERL=1 (YesPlease),
+# or add a leading '+' to the recipe '+$(QUIET_GEN)$(FIND) perl ...'
so that it is executed.
perl/PM.stamp: FORCE
@$(FIND) perl -type f -name '*.pm' | sort >$@+ && \
{ cmp $@+ $@ >/dev/null 2>/dev/null || mv $@+ $@; } && \
--
2.3.1
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