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Re: Autoconf protype breaks GCC builtin inlining


From: Ferenc Wágner
Subject: Re: Autoconf protype breaks GCC builtin inlining
Date: Thu, 25 Jan 2018 23:44:36 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Jeffrey Walton <address@hidden> writes:

> AC_MSG_CHECKING([if $LDNAME supports $LDFLAGS])
>   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
>     [AC_MSG_RESULT([yes]); AC_SUBST([tr_RESULT], [1])],
>     [AC_MSG_RESULT([no]); AC_SUBST([tr_RESULT], [0])]
> )

Thanks for the example!  Why is AC_COMPILE_IFELSE enough?  Don't you
have to invoke the linker itself to see if it accepts the option passed
through?  And is the "-Wl," part applicable to most/all compilers?

BTW my other generic linker option is --enable-new-dtags.  I'd be
interested to hear opinions about its usage as well.  I found no other
way to run build-time test for a shared library dlopening modules.
(I know libtool can provide better portability than dlopen.)
-- 
Thanks,
Feri



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