On 19-04-16 15:20, Nick Bowler wrote:
| On 4/16/19, Jannick <thirdedition@xxxxxxx> wrote:
| > I am wondering if there is an elegant way to pass additional diff options
| > on to AT_CHECK in a testsuite - ideally on the level of .ac, .am, .at files
| > or alike?
| [...]
| > configure translates this code snip into the script testsuite where - and
| > this is really evil hackery I solemnly confess and I would like to avoid -
| > I changed the definition of the variable at_diff. In my cases the diff
| > options are the same for all tests in each of the relevant projects.
| >
| > I am aware that the test output could be restructured, but this question
| > focuses at autoconf, autotest, AT_CHECK and friends. Using a customized
| > version of autotest/general.m4 would not be optimal, since the project
| > should automatically benefit from updates of autoconf/automake out of the
| > box.
|
| Aside from hackery like you describe, I do not believe there is any
| built-in way to modify the behaviour of AT_CHECK like this.
|
| But you can just do whatever comparison you want directly in AT_CHECK...
| there is no reason to use the built-in diff when it is inadequate for
| your test case.
|
| For example, if I want to use 'cmp' instead of 'diff' I might write
| (untested):
|
| AT_CHECK([:; { commands_to_generate_output
| } >stdout && cmp stdout expected_output])
|
| And if I did that a lot I would define a macro for it.
I used another solution where wanted to use a different diff
implementation for AT_CHECK() that that allowed for regexes to
be used in places where the output changes each test run.
See my "pyrediff" project: https://github.com/lukem/pyrediff
In pyrediff, I implemented a new macro with similar semantics to
AT_CHECK() which temporarily overrode the setting of at_diff before
calling AT_CHECK(), and set at_diff back before AT_CHECK() returns.
Per ax_at_check_pyrediff.m4, the definition is:
m4_defun([AX_AT_CHECK_PYREDIFF], [dnl
AS_REQUIRE([_AX_AT_CHECK_PYRE_PREPARE])
_ax_at_check_pyrediff_prepare_original_at_diff="$at_diff"
at_diff='ax_at_diff_pyre'
AT_CHECK(m4_expand([$1]), [$2], m4_expand([$3]), m4_expand([$4]),
[at_diff="$_ax_at_check_pyrediff_prepare_original_at_diff";$5],
[at_diff="$_ax_at_check_pyrediff_prepare_original_at_diff";$6])
])dnl AX_AT_CHECK_PYREDIFF
The _AX_AT_CHECK_PYRE_PREPARE does some preparation
including defining the shell function ax_at_diff_pyre
that is used as the replacement at_diff.
Note: if autotest's AT_CHECK() was extended in the future to
support a new (optional) argument as the overload for at_diff,
I would adapt to using that.
I hope that's useful,
Luke.
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