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Unset MAKEFLAGS in the test script so it works if it's run using
a version of make that has options which pdpmake doesn't understand.
Return $FAILCOUNT as the exit status so the number of failures can
be reported.
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The POSIX standard defines suffix substitution in macro expansion
as taking the form:
$(string1 [: subst1 =[ subst2 ]])
Since 'subst1' isn't bracketed a value must be supplied. Enforce
this in POSIX mode.
As a non-POSIX extension an empty 'subst1' is permitted with 'subst2'
being added to all words unconditionally. If both 'subst1' and
'subst2' are empty the words are returned unchanged.
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The test for valid macro names in POSIX mode was incorrect: it
shouldn't have allowed '-'.
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A typo in the previous commit caused dyndep() to process inference
rules incorrectly. This didn't affect the results of the test suite
when extensions were allowed but it caused the test 'Inference rule
with explicit rule for prerequisite' to fail in POSIX mode.
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Austin Group defect report 875 clarifies some aspects of inference
rules. The crux of the issue is related to chained inference rules
so it doesn't affect POSIX mode. The test makefile looks like this:
.SUFFIXES: .a .b .c
.a.c:
@echo .a.c
.b.c:
@echo .b.c
test.c: test.b
test.a:
test.b:
The correct output is deemed to be '.a.c'. Additional complications
are:
- whether or not the prerequisite files are present;
- the use of the suffixes '.a' and '.c' may result in the builtin
inference rule '.c.a' being considered.
In favourable circumstances pdpmake managed to give the correct
result, in unfavourable it reported circular dependencies or
segfaulted.
Changes to fix these issues are:
- When prerequisites are being recursively built the standard says:
'Upon recursion, each prerequisite shall become a target itself.'
Follow this requirement.
- At the end of make() the target being built should have its time
(as represented by n_tim in struct name) updated when any action
has been taken.
- When dyndep() is looking for prerequisites it should:
* skip candidates that are in the process of being built;
* consider whether an explicit candidate is a target, not whether
it has any commands associated with it.
pdpmake now behaves similarly to GNU make when presented with
makefiles like the above. bmake gives the incorrect output '.b.c'.
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The POSIX specification says:
There are three kinds of comments: blank lines, empty lines, and
a <number-sign> ('#') and all following characters up to the first
unescaped <newline> character.
Most implementations don't treat '#' in a macro expansion or a command
line as the start of a comment. POSIX doesn't mention either of these
exceptions.
Permit the exceptions as a non-POSIX extension.
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Use $? instead of $^ in the test for .WAIT. bmake supports .WAIT
but not $^.
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Austin Group defect report 1549 has been accepted. It requires
that an escaped newline inside a macro expansion in a command is
replaced by a space. Other escaped newlines in commands are
left in place, as before.
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Austin Group defect report 1437 has been accepted. It describes
the special targets .NOTPARALLEL and .WAIT which are used to
influence the behaviour of parallel builds.
Since parallel builds aren't implemented in here they actually don't
't have much effect.
- For completeness they're flagged as special targets.
- .WAIT should be allowed as a prerequisite.
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Austin Group defect report 337 has been accepted, thus making
macro assignment from the output of a shell command (!=) a
POSIX 202X feature.
This was previously implemented as a non-POSIX extension.
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Austin Group defect reports 514 and 1520 have both been accepted.
Together these introduce the internal macros $+ and $^:
- $+ lists all prerequisites, with duplicates retained;
- $^ lists all prerequisites, with duplicates removed.
$^ had already been implemented as a non-POSIX extension, it now
becomes a POSIX 202X extension. $+ has been added as a POSIX
202X extension.
Neither of the above defect reports mentions how $? should handle
duplicate prerequisites. In POSIX mode duplicates are retained.
Removal of duplicates is implemented as a non-POSIX extension to
match existing practice in other versions of make.
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This is an experimental implementation of make for busybox-w32,
based on my public domain POSIX make:
https://frippery.org/make/
(GitHub issue #44)
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