[src/trunk]: src/usr.bin/make/unit-tests make(1): try to set the variable nam...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0dbbcab04175
branches:  trunk
changeset: 975174:0dbbcab04175
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Aug 22 21:22:24 2020 +0000

description:
make(1): try to set the variable named "" using the command line

Before 2020-08-22, the command line argument '=cmline-plain' triggered
undefined behavior, just like the assignment '=assigned' in the Makefile.

diffstat:

 usr.bin/make/unit-tests/Makefile          |   4 +++-
 usr.bin/make/unit-tests/varname-empty.exp |  12 ++++++++++--
 usr.bin/make/unit-tests/varname-empty.mk  |   8 ++++----
 3 files changed, 17 insertions(+), 7 deletions(-)

diffs (68 lines):

diff -r 1918acc6d62d -r 0dbbcab04175 usr.bin/make/unit-tests/Makefile
--- a/usr.bin/make/unit-tests/Makefile  Sat Aug 22 21:12:29 2020 +0000
+++ b/usr.bin/make/unit-tests/Makefile  Sat Aug 22 21:22:24 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.111 2020/08/22 20:50:43 sjg Exp $
+# $NetBSD: Makefile,v 1.112 2020/08/22 21:22:24 rillig Exp $
 #
 # Unit tests for make(1)
 #
@@ -323,6 +323,7 @@
 FLAGS.recursive=       -dL
 FLAGS.vardebug=                -k -dv FROM_CMDLINE=
 FLAGS.varmod-match-escape= -dv
+FLAGS.varname-empty=   -dv '$${:U}=cmdline-u' '=cmline-plain'
 
 # Some tests need extra post-processing.
 SED_CMDS.sh-dots+=     -e 's,^${.SHELL}: ,,'
@@ -336,6 +337,7 @@
 POSTPROC.counter=      ${TOOL_SED} -n -e '/:RELEVANT = yes/,/:RELEVANT = no/p'
 POSTPROC.vardebug=     ${TOOL_SED} -n -e '/:RELEVANT = yes/,/:RELEVANT = no/p'
 POSTPROC.varmod-match-escape= ${TOOL_SED} -n -e '/^Pattern/p'
+POSTPROC.varname-empty=        ${TOOL_SED} -n -e '/^Var_Set/p' -e '/^out:/p'
 
 # Some tests reuse other tests, which makes them unnecessarily fragile.
 export-all.rawout: export.mk
diff -r 1918acc6d62d -r 0dbbcab04175 usr.bin/make/unit-tests/varname-empty.exp
--- a/usr.bin/make/unit-tests/varname-empty.exp Sat Aug 22 21:12:29 2020 +0000
+++ b/usr.bin/make/unit-tests/varname-empty.exp Sat Aug 22 21:22:24 2020 +0000
@@ -1,3 +1,11 @@
-fallback
-1 2 3
+Var_Set("${:U}", "cmdline-u", ...) name expands to empty string - ignored
+Var_Set("", "cmline-plain", ...) name expands to empty string - ignored
+Var_Set("", "default", ...) name expands to empty string - ignored
+Var_Set("", "assigned", ...) name expands to empty string - ignored
+Var_Set("", "appended", ...) name expands to empty string - ignored
+Var_Set("", "", ...) name expands to empty string - ignored
+Var_Set("", "subst", ...) name expands to empty string - ignored
+Var_Set("", "shell-output", ...) name expands to empty string - ignored
+out: fallback
+out: 1 2 3
 exit status 0
diff -r 1918acc6d62d -r 0dbbcab04175 usr.bin/make/unit-tests/varname-empty.mk
--- a/usr.bin/make/unit-tests/varname-empty.mk  Sat Aug 22 21:12:29 2020 +0000
+++ b/usr.bin/make/unit-tests/varname-empty.mk  Sat Aug 22 21:22:24 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: varname-empty.mk,v 1.4 2020/08/22 21:12:29 rillig Exp $
+# $NetBSD: varname-empty.mk,v 1.5 2020/08/22 21:22:24 rillig Exp $
 #
 # Tests for the special variable with the empty name.
 #
@@ -12,7 +12,7 @@
 =      assigned        # undefined behavior until 2020-08-22
 +=     appended
 :=     subst
-!=     echo 'value'
+!=     echo 'shell-output'
 
 # The .for loop expands the expression ${i} to ${:U1}, ${:U2} and so on.
 # This only works if the variable with the empty name is guaranteed to
@@ -22,5 +22,5 @@
 .endfor
 
 all:
-       @echo ${:Ufallback}
-       @echo ${NUMBERS}
+       @echo out: ${:Ufallback}
+       @echo out: ${NUMBERS}