[patch #9900] New AX_CHECK_PCRE2

[anonymous]

Follow-up Comment #4, patch #9900 (project autoconf-archive):


[comment #3 comment #3:]
> Added to the archive in 1ce158d78a281e7be9bf495c0b5f1d193142a130. Thank you
very much for the submission.

Thank you! Today I ran into a very strange problem, which I do not understand.
This problem may not be necessarily related to the AX_CHECK_PCRE2 submission.
I just don't know why this happens even after years of using autoconf.

My configure.ac has:

AX_CHECK_PCRE2([8],
[],
[echo "sorry, PCRE2 is not usable"]
)

Then running autoheader produces a config.h.in with the PCRE2 entry. Nice.

But with this minor change:

AX_CHECK_PCRE2([8],
[echo "using PCRE2"],
[echo "sorry, PCRE2 is not usable"]
)

running autoheader does NOT add a PCRE2 entry to config.h.in. This means that
all builds fail after autoconf and when the user executes ./configure.

I've looked into this, but can't figure out what is going on with autoheader.
Perhaps other users will run into this bug with autoheader or with
AX_CHECK_PCRE2.

- Robert

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