CVS commit: src

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

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.