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https://github.com/freebsd/freebsd-src
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ee914ef902
Lots more unit tests and code cleanup
Relevant changes from ChangeLog
o job.c: Print -de error information when running multiple jobs
o var.c: only report error for unmatched regex subexpression
when linting (-dL) since we cannot tell when an unmatched
subexpression is an expected result.
reduce memory allocations in the modifiers ':D' and ':U'
reduce memory allocation and strlen calls in modifier ':from=to'
in the ':Q' modifier, only allocate memory if necessary
improve performance for LazyBuf
reduce debug logging and memory allocation for ${:U...}
reduce verbosity of the -dv debug logging for standard cases
fix double varname expansion in the variable modifier '::='
o var.c: avoid evaluating many modifiers in parse only mode
in strict mode (-dL) many variable references are parsed twice,
the first time just to report parse errors early, so we want to
avoid side effects and wasted effort to the extent possible.
29 lines
888 B
Makefile
Executable file
29 lines
888 B
Makefile
Executable file
# $NetBSD: counter-append.mk,v 1.5 2021/04/04 10:13:09 rillig Exp $
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#
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# Demonstrates how to let make count the number of times a variable
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# is actually accessed, using the ::+= variable modifier.
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#
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# This works since 2020-09-23. Before that, the counter ended up at having
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# 6 words, even though the NEXT variable was only accessed 3 times.
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# The cause for this surprising behavior was that the ::= variable modifiers
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# returned an error marker instead of a simple empty string.
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RELEVANT= yes (load-time part) # just to filter the output
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COUNTER= # zero
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NEXT= ${COUNTER::+=a}${COUNTER:[#]}
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# This variable is first set to empty and then expanded.
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# See parse.c, function Parse_Var, keyword "!Var_Exists".
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A:= ${NEXT}
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B:= ${NEXT}
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C:= ${NEXT}
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RELEVANT= no
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all:
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@: ${RELEVANT::=yes (run-time part)}
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@echo A=${A:Q} B=${B:Q} C=${C:Q} COUNTER=${COUNTER:[#]:Q}
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@: ${RELEVANT::=no}
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