PR/43821 CVS commit: src

["Roland Illig" <rillig%netbsd.org@localhost>]

The following reply was made to PR bin/43821; it has been noted by GNATS.

From: "Roland Illig" <rillig%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/43821 CVS commit: src
Date: Mon, 23 May 2022 22:33:56 +0000

 Module Name:	src
 Committed By:	rillig
 Date:		Mon May 23 22:33:56 UTC 2022
 
 Modified Files:
 	src/distrib/sets/lists/tests: mi
 	src/usr.bin/make/unit-tests: Makefile
 Added Files:
 	src/usr.bin/make/unit-tests: directive-for-empty.exp
 	    directive-for-empty.mk
 
 Log Message:
 tests/make: document and demonstrate .for i containing .if empty(i)
 
 PR bin/43821 describes the inconsistency that in a '.for i' loop, the
 condition '.if ${i:M*.c}' works since 2009 while the seemingly
 equivalent condition '.if !empty(i:M*.c)' does not access the variable
 'i' from the .for loop but instead the global 'i'.
 
 Resolving this situation in a backwards-compatible and non-surprising
 way is hard, as make has grown several features during the last 20 years
 that interact in various edge cases.  For now, document the most obvious
 pitfalls.
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.1206 -r1.1207 src/distrib/sets/lists/tests/mi
 cvs rdiff -u -r1.315 -r1.316 src/usr.bin/make/unit-tests/Makefile
 cvs rdiff -u -r0 -r1.1 src/usr.bin/make/unit-tests/directive-for-empty.exp \
     src/usr.bin/make/unit-tests/directive-for-empty.mk
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.