38 lines
1.3 KiB
Makefile
38 lines
1.3 KiB
Makefile
# $NetBSD: opt-debug-file.mk,v 1.4 2020/10/05 19:27:48 rillig Exp $
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#
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# Tests for the -dF command line option, which redirects the debug log
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# to a file instead of writing it to stderr.
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# Enable debug logging for variable assignments and evaluation (-dv)
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# and redirect the debug logging to the given file.
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.MAKEFLAGS: -dvFopt-debug-file.debuglog
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# This output goes to the debug log file.
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VAR= value ${:Uexpanded}
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# Hide the logging output for the remaining actions.
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# As of 2020-10-03, it is not possible to disable debug logging again.
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.MAKEFLAGS: -dF/dev/null
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# Make sure that the debug logging file contains some logging.
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DEBUG_OUTPUT:= ${:!cat opt-debug-file.debuglog!}
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# Grmbl. Because of the := operator in the above line, the variable
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# value contains ${:Uexpanded}. This variable expression is expanded
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# upon further processing. Therefore, don't read from untrusted input.
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#.MAKEFLAGS: -dc -dFstderr
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.if !${DEBUG_OUTPUT:tW:M*VAR = value expanded*}
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. error ${DEBUG_OUTPUT}
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.endif
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# To get the unexpanded text that was actually written to the debug log
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# file, the content of that log file must not be stored in a variable.
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# XXX: In the :M modifier, a dollar is escaped as '$$', not '\$'.
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.if !${:!cat opt-debug-file.debuglog!:tW:M*VAR = value $${:Uexpanded}*}
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. error
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.endif
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_!= rm opt-debug-file.debuglog
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all:
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@:;
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