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40 lines
1.4 KiB
Makefile
40 lines
1.4 KiB
Makefile
# $NetBSD: recursive.mk,v 1.6 2023/06/01 20:56:35 rillig Exp $
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#
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# In -dL mode, a variable may get expanded before it makes sense.
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# This would stop make from doing anything since the "recursive" error
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# is fatal and exits immediately.
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#
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# The purpose of evaluating that variable early was just to detect
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# whether there are unclosed variables. The variable value is therefore
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# parsed with VARE_PARSE_ONLY for that purpose.
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#
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# Seen in pkgsrc/x11/libXfixes, and probably many more package that use
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# GNU Automake.
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.MAKEFLAGS: -dL
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AM_V_lt= ${am__v_lt_${V}}
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am__v_lt_= ${am__v_lt_${AM_DEFAULT_VERBOSITY}}
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am__v_lt_0= --silent
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am__v_lt_1=
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# On 2020-08-06, make reported: "Variable am__v_lt_ is recursive."
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libXfixes_la_LINK= ... ${AM_V_lt} ...
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# somewhere later ...
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AM_DEFAULT_VERBOSITY= 1
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# The purpose of the -dL flag is to detect unclosed variables. This
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# can be achieved by just parsing the variable and not evaluating it.
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#
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# When the variable is only parsed but not evaluated, bugs in nested
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# variables are not discovered. But these are hard to produce anyway,
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# therefore that's acceptable. In most practical cases, the missing
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# brace would be detected directly in the line where it is produced.
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MISSING_BRACE_INDIRECT:= ${:U\${MISSING_BRACE}
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# expect+1: Unclosed variable "MISSING_PAREN"
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UNCLOSED= $(MISSING_PAREN
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# expect+1: Unclosed variable "MISSING_BRACE"
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UNCLOSED= ${MISSING_BRACE
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UNCLOSED= ${MISSING_BRACE_INDIRECT}
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