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Re: Conditional AC_CHECK_HEADER
From: |
Sam James |
Subject: |
Re: Conditional AC_CHECK_HEADER |
Date: |
Sat, 4 Feb 2023 16:58:49 +0000 |
> On 4 Feb 2023, at 13:42, Florian Weimer <fweimer@redhat.com> wrote:
>
> The x11vnc configure.ac script contains this:
>
> | if test "x$with_v4l" != "xno"; then
> | AC_CHECK_HEADER(linux/videodev.h,
> | [AC_DEFINE(HAVE_LINUX_VIDEODEV_H)],,)
> | fi
>
> This is the point where all the default header check are inserted, so
> when the condition is false, they are not run. Making the
> AC_CHECK_HEADER invocation unconditional fixes that.
>
> I want to submit this upstream. Is there are some explanation somewhere
> why it's not permitted to invoke AC_CHECK_HEADER under shell conditional
> statement? I couldn't find it in the manual.
There's a tendency for quoting to go wrong with shell conditionals overall,
which is why I try to push people towards AS_IF.
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