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Subject: [Bug target/47032] libgfortran references complex long double functions missing on AIX
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47032

--- Comment #9 from Steve Kargl <sgk at troutmask dot apl.washington.edu> 2011-02-08 20:49:04 UTC ---
On Tue, Feb 08, 2011 at 08:43:33PM +0000, pogma at gcc dot gnu.org wrote:
> --- Comment #8 from Peter O'Gorman <pogma at gcc dot gnu.org> 2011-02-08 20:43:18 UTC ---
> (In reply to comment #7)
> > (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.
> 
> As far as I can tell the problem is that the configure tests for long double
> functions don't #include <math.h>, changing the AC_CHECK_LIB to AC_LINK_IFELSE
> that #includes math.h and uses the symbol should give correct results.
> 

So, for the AC_CHECK_LIB line above, what does the
AC_LINK_IFELSE patch look like.