2c3632d14f
Lots of code refactoring, simplification and cleanup. Lots of new unit-tests providing much higher code coverage. All courtesy of rillig at netbsd. Other significant changes: o new read-only variable .SHELL which provides the path of the shell used to run scripts (as defined by the .SHELL target). o variable parsing detects more errors. o new debug option -dl: LINT mode, does the equivalent of := for all variable assignments so that file and line number are reported for variable parse errors.
38 lines
1.3 KiB
Makefile
38 lines
1.3 KiB
Makefile
# $NetBSD: recursive.mk,v 1.2 2020/08/06 05:52:45 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. It might be enough to parse the
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# variable value without VARE_WANTRES 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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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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UNCLOSED = $(MISSING_PAREN
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UNCLOSED = ${MISSING_BRACE
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UNCLOSED = ${MISSING_BRACE_INDIRECT}
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