e2eeea75eb
o allow env var MAKE_OBJDIR_CHECK_WRITABLE=no to skip writable checks in InitObjdir. Explicit .OBJDIR target always allows read-only directory. o More code cleanup and refactoring. o More unit tests MFC after: 1 week
67 lines
2.3 KiB
Makefile
67 lines
2.3 KiB
Makefile
# $NetBSD: depsrc-ignore.mk,v 1.5 2020/11/15 20:20:58 rillig Exp $
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#
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# Tests for the special source .IGNORE in dependency declarations,
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# which ignores any command failures for that target.
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#
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# Even though 'ignore-errors' fails, 'all' is still made. Since 'all' is
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# not marked with .IGNORE, it stops at the first failing command.
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#
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# XXX: The ordering of the messages in the output is confusing.
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# The "ignored" comes much too late to be related to the "false
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# ignore-errors". This is due to stdout being buffered.
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#
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# The "continuing" message comes from the -k option. If there had been
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# other targets independent of "all", these would be built as well.
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#
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# Enabling the debugging option -de changes the order in which the messages
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# appear. Now the "ignored" message is issued in the correct position.
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# The explanation for the output reordering is that the output is buffered.
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# As the manual page says, in debugging mode stdout is line buffered.
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# In these tests the output is redirected to a file, therefore stdout is
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# fully buffered.
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#
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# This is what actually happens, as of 2020-08-29. To verify it, set the
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# following breakpoints in CompatRunCommand:
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#
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# * the "!silent" line, to see all commands
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# * the "fflush" line, to see stdout being flushed
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# * the "status = WEXITSTATUS" line
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# * the "(continuing)" line
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# * the "(ignored)" line
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#
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# The breakpoints are visited in the following order:
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#
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# "ignore-errors begin"
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# Goes directly to STDOUT_FILENO since it is run in a child process.
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# "false ignore-errors"
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# Goes to the stdout buffer (CompatRunCommand, keyword "!silent") and
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# the immediate call to fflush(stdout) copies it to STDOUT_FILENO.
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# "*** Error code 1 (ignored)"
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# Goes to the stdout buffer but is not flushed (CompatRunCommand, near
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# the end).
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# "ignore-errors end"
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# Goes directly to STDOUT_FILENO.
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# "all begin"
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# Goes directly to STDOUT_FILENO.
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# "false all"
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# Goes to the stdout buffer, where the "*** Error code 1 (ignored)" is
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# still waiting to be flushed. These two lines are flushed now.
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# "*** Error code 1 (continuing)"
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# Goes to the stdout buffer.
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# "Stop."
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# Goes to the stdout buffer.
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# exit(1)
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# Flushes the stdout buffer to STDOUT_FILENO.
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all: ignore-errors
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ignore-errors: .IGNORE
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@echo $@ begin
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false $@
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@echo $@ end
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all:
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@echo $@ begin
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false $@
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@echo $@ end
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