URL:
<http://savannah.gnu.org/bugs/?31940>
Summary: trailing slash dropped from nonphony multicharacter
targets
Project: make
Submitted by: None
Submitted on: Tue 21 Dec 2010 01:45:35 AM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 3.82
Operating System: Any
Fixed Release: None
Triage Status: None
_______________________________________________________
Details:
Background: A pattern rule '%/' would be useful to mean "any directory".
However, this only works when the directory name is a single character.
Buggy behavior:
1. If the directory names are explicit instead of using a pattern rule,
everything works, except that trailing slashes disappear in the $@ variable.
2. If a target has prerequisites that is multiple characters followed by a
slash, the the target name as given is not searched-for. Instead, the name
without the slash is looked-for.
Documentation:
POSIX says:
"Applications shall select target names from the set of characters consisting
solely of periods, underscores, digits, and alphabetics from the portable
character set (see XBD Portable Character Set). Implementations may allow
other characters in target names as extensions."
Any use at all of subdirectories is an extension?
The GNU Make Manual makes it clear that subdirectories work, but never
mentions trailing slashes.
Workarounds:
1. Explicitly specify every %/ target as .PHONY : (behavior is not exact)
2. In addition to %/, specify %a/ %A/ %b/ %B/ ... (behavior is as intended)
Incompatibility:
Fixing this behavior would break Makefiles that mixed the use of slashed and
nonslashed directories. Such Makefiles are unlikely.
Reproduced on:
make 3.81 (Ubuntu)
make 3.81 (Gentoo)
make 3.82 (vanilla)
Summary of attachment:
%/ %t/: mkdir
a/b : | a/ - OK
xxt/f : | xxt/ - works
yy/zz : | yy/ - broken
Output of attached minimal makefile:
mkdir -p a/
touch a/b
mkdir -p xxt
touch xxt/f
make: *** No rule to make target `yy', needed by `yy/zz'. Stop.
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Tue 21 Dec 2010 01:45:35 AM UTC Name: Makefile Size: 347B By: None
<http://savannah.gnu.org/bugs/download.php?file_id=22251>
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