[Bug target/47032] libgfortran references complex long double functions missing on AIX

[rwild at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47032

--- Comment #7 from Ralf Wildenhues <rwild at gcc dot gnu.org> 2011-02-04 05:16:15 UTC ---
(In reply to comment #3)
> libgfortran/configure.ac has lines of the form (note I wrapped the line)
> 
> AC_CHECK_LIB([m],[copysignl],[AC_DEFINE([HAVE_COPYSIGNL],[1],\
>    [libm includes copysignl])])
> 
> So, configure is already checking if libm contains the
> the "long double functions".  The problem appears to be
> that AC_CHECK_LIB is a compile only test, and these tests
> appear to pass on AIX.

AC_CHECK_LIB uses a link test, not a compile test.