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1b65f0bd2b
o allow env var MAKE_OBJDIR_CHECK_WRITABLE=no to skip writable checks in InitObjdir. Explicit .OBJDIR target always allows read-only directory. o Fix building and unit-tests on non-BSD. o More code cleanup and refactoring. o More unit tests
85 lines
2.4 KiB
Makefile
85 lines
2.4 KiB
Makefile
# $NetBSD: var-op-shell.mk,v 1.3 2020/11/09 20:39:46 rillig Exp $
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#
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# Tests for the != variable assignment operator, which runs its right-hand
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# side through the shell.
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# The variable OUTPUT gets the output from running the shell command.
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OUTPUT!= echo "success"'ful'
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.if ${OUTPUT} != "successful"
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. error
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.endif
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# Since 2014-08-20, the output of the shell command may be empty.
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#
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# On 1996-05-29, when the '!=' assignment operator and Cmd_Exec were added,
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# an empty output produced the error message "Couldn't read shell's output
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# for \"%s\"".
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#
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# The error message is still there but reserved for technical errors.
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# It may be possible to trigger the error message by killing the shell after
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# reading part of its output.
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OUTPUT!= true
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.if ${OUTPUT} != ""
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. error
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.endif
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# The output of a shell command that failed is processed nevertheless.
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# TODO: Make this an error in lint mode.
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OUTPUT!= echo "failed"; false
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.if ${OUTPUT} != "failed"
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. error
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.endif
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# A command with empty output may fail as well.
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OUTPUT!= false
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.if ${OUTPUT} != ""
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. error
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.endif
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# In the output of the command, each newline is replaced with a space.
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# Except for the very last one, which is discarded.
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OUTPUT!= echo "line 1"; echo "line 2"
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.if ${OUTPUT} != "line 1 line 2"
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. error
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.endif
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# A failing command in the middle results in the exit status 0, which in the
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# end means that the whole sequence of commands succeeded.
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OUTPUT!= echo "before"; false; echo "after"
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.if ${OUTPUT} != "before after"
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. error
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.endif
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# NB: The signal number must be numeric since some shells (which ones?) don't
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# accept symbolic signal names. 14 is typically SIGALRM.
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#
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# XXX: The number of the signal is not mentioned in the warning since that
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# would have been difficult to implement; currently the errfmt is a format
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# string containing a single %s conversion.
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OUTPUT!= kill -14 $$$$
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.if ${OUTPUT} != ""
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. error
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.endif
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# A nonexistent command produces a non-zero exit status.
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OUTPUT!= /bin/no/such/command
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.if ${OUTPUT} != ""
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. error
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.endif
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# The output from the shell's stderr is not captured, it just passes through.
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OUTPUT!= echo "stdout"; echo "stderr" 1>&2
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.if ${OUTPUT} != "stdout"
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. error
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.endif
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# The 8 dollar signs end up as 4 dollar signs when expanded. The shell sees
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# the command "echo '$$$$'". The 4 dollar signs are stored in OUTPUT, and
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# when that variable is expanded, they expand to 2 dollar signs.
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OUTPUT!= echo '$$$$$$$$'
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.if ${OUTPUT} != "\$\$"
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. error
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.endif
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all:
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