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[src/trunk]: src/usr.bin/make/unit-tests make(1): document 20-year-old bug in...
details: https://anonhg.NetBSD.org/src/rev/3634d1ceaa90
branches: trunk
changeset: 946132:3634d1ceaa90
user: rillig <rillig%NetBSD.org@localhost>
date: Tue Nov 17 20:08:09 2020 +0000
description:
make(1): document 20-year-old bug in the :!cmd! modifier
diffstat:
usr.bin/make/unit-tests/varmod-shell.exp | 2 ++
usr.bin/make/unit-tests/varmod-shell.mk | 28 ++++++++++++++++++++++++++--
2 files changed, 28 insertions(+), 2 deletions(-)
diffs (48 lines):
diff -r 555adf0d8776 -r 3634d1ceaa90 usr.bin/make/unit-tests/varmod-shell.exp
--- a/usr.bin/make/unit-tests/varmod-shell.exp Tue Nov 17 19:56:42 2020 +0000
+++ b/usr.bin/make/unit-tests/varmod-shell.exp Tue Nov 17 20:08:09 2020 +0000
@@ -1,1 +1,3 @@
+make: "" returned non-zero status
+make: "previous value" returned non-zero status
exit status 0
diff -r 555adf0d8776 -r 3634d1ceaa90 usr.bin/make/unit-tests/varmod-shell.mk
--- a/usr.bin/make/unit-tests/varmod-shell.mk Tue Nov 17 19:56:42 2020 +0000
+++ b/usr.bin/make/unit-tests/varmod-shell.mk Tue Nov 17 20:08:09 2020 +0000
@@ -1,11 +1,35 @@
-# $NetBSD: varmod-shell.mk,v 1.3 2020/11/15 20:20:58 rillig Exp $
+# $NetBSD: varmod-shell.mk,v 1.4 2020/11/17 20:08:09 rillig Exp $
#
# Tests for the :sh variable modifier, which runs the shell command
# given by the variable value and returns its output.
#
-# TODO: Since when is this modifier available?
+# This modifier has been added on 2000-04-29.
+#
+# See also:
+# ApplyModifier_ShellCommand
# TODO: Implementation
+# The command to be run is enclosed between exclamation marks.
+# The previous value of the expression is irrelevant for this modifier.
+# The :!cmd! modifier turns an undefined expression into a defined one.
+.if ${:!echo word!} != "word"
+. error
+.endif
+
+# If the command exits with non-zero, an error message is printed.
+# XXX: Processing continues as usual though.
+#
+# Since 2000-04-29, the error message mentions the previous
+# value of the expression (which is usually an empty string) instead of the
+# command that was executed. It's strange that such a simple bug could
+# survive such a long time.
+.if ${:!echo word; false!} != "word"
+. error
+.endif
+.if ${:Uprevious value:!echo word; false!} != "word"
+. error
+.endif
+
all:
@:;
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