Re: libtool C++ link bug with -lm functions with Sun Workshop compiler

[Bob Friesenhahn]

On Wed, 19 Mar 2008, Tim Mooney wrote:
> That means that doing something like
>
>
> AC_INIT(lttest, 0.60.5)
> AC_CONFIG_SRCDIR(configure.ac)
> AC_PROG_CXX
> AC_LANG([C++])
>
> AC_CHECK_FUNCS(sqrt)
> AC_OUTPUT
>
>
> will always detect sqrt(), because the C++ compiler added `-lm -lc'
> behind the scenes.

Then it seems like you did something wrong and libtool is not to 
blame.  Perhaps it is not best to run most of your configure script 
using the C++ compiler.  Only run the C++ compiler to test C++ things.

I use

LT_LANG([C++])

to tell libtool that I need support for C++.  Then I do C++ related 
testing like this

AC_LANG_PUSH(C++)
  some C++ tests
AC_LANG_POP

This works great under Solaris!

Bob
======================================
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/