diff options
Diffstat (limited to 'unit-tests/recursive.mk')
| -rw-r--r-- | unit-tests/recursive.mk | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/unit-tests/recursive.mk b/unit-tests/recursive.mk new file mode 100644 index 000000000000..bc5a2817b333 --- /dev/null +++ b/unit-tests/recursive.mk @@ -0,0 +1,37 @@ +# $NetBSD: recursive.mk,v 1.2 2020/08/06 05:52:45 rillig Exp $ +# +# In -dL mode, a variable may get expanded before it makes sense. +# This would stop make from doing anything since the "recursive" error +# is fatal and exits immediately. +# +# The purpose of evaluating that variable early was just to detect +# whether there are unclosed variables. It might be enough to parse the +# variable value without VARE_WANTRES for that purpose. +# +# Seen in pkgsrc/x11/libXfixes, and probably many more package that use +# GNU Automake. + +AM_V_lt = $(am__v_lt_$(V)) +am__v_lt_ = $(am__v_lt_$(AM_DEFAULT_VERBOSITY)) +am__v_lt_0 = --silent +am__v_lt_1 = + +# On 2020-08-06, make reported: "Variable am__v_lt_ is recursive." +libXfixes_la_LINK = ... $(AM_V_lt) ... + +# somewhere later ... +AM_DEFAULT_VERBOSITY = 1 + + +# The purpose of the -dL flag is to detect unclosed variables. This +# can be achieved by just parsing the variable and not evaluating it. +# +# When the variable is only parsed but not evaluated, bugs in nested +# variables are not discovered. But these are hard to produce anyway, +# therefore that's acceptable. In most practical cases, the missing +# brace would be detected directly in the line where it is produced. +MISSING_BRACE_INDIRECT:= ${:U\${MISSING_BRACE} +UNCLOSED = $(MISSING_PAREN +UNCLOSED = ${MISSING_BRACE +UNCLOSED = ${MISSING_BRACE_INDIRECT} + |