Re: Conditional problem

[Jose Roman Bilbao]

Thanks for your response but still does not work, I have left my code in
configure.in:

MDL_HAVE_OPENGL

if test -z "$GL_LIBS"
then
        AC_MSG_RESULT([GL libs not found, OpenGL disabled.])
else
        if test -z "$GL_CFLAGS"
        then
                AC_MSG_RESULT([GL headers not found, OpenGL disabled.])
        else
                AC_MSG_RESULT([OpenGL flags: $GL_CFLAGS])
                AC_MSG_RESULT([OpenGL libs: $GL_LIBS])
        fi
fi
AM_CONDITIONAL( WITH_OPENGL, test -n "$GL_FLAGS")
AM_CONDITIONAL( WITH_OPENGL, test -n "$GL_LIBS")

and in my makefile.am:

if WITH_OPENGL
        bin_PROGRAMS = phan3D
endif
 
but it does not work, I can not get it to compile conditionally. Please,
can someone show me how to correct my code?

Thanks

Roman


On Fri, 2004-02-06 at 10:38, Ralf Corsepius wrote:
> On Fri, 2004-02-06 at 09:24, Jose Roman Bilbao wrote:
> > Hi,
> > 
> > What is wrong with this piece of code? It always says that there is no
> > OpenGL although it has been found:
> > 
> > #checking for OpenGL
> > MDL_HAVE_OPENGL
> > 
> > if test -z "$GL_LIBS"
> > then
> >     AC_MSG_RESULT([GL libs not found, OpenGL disabled.])
> > else
> >     if test -z "$GL_CFLAGS"
> >     then
> >             AC_MSG_RESULT([GL headers not found, OpenGL disabled.])
> >     else
> >             AC_MSG_RESULT([OpenGL flags: $GL_CFLAGS])
> >             AC_MSG_RESULT([OpenGL libs: $GL_LIBS])
> >     fi
> > fi
> > AM_CONDITIONAL( WITH_OPENGL, test -n "$GL_FLAGS")
> > AM_CONDITIONAL( WITH_OPENGL, test -n "$GL_LIBS")
> The WITH_OPENGL's in these AM_CONDITIONALS are strings autoconf
> internally uses to set up its magic. 
> 
> > if test x"$WITH_OPENGL" = xtrue; then
> Here, you expect WITH_OPENGL to be a shell variable.
> 
> >       AC_MSG_RESULT( OpenGL)
> > else
> >     AC_MSG_RESULT( NO OpenGL )
> > fi
> > 
> > I suppose it is my inexperience, I have read autoconf and automake
> > manuals and still no solution. 
> Have a look into your configure and search for WITH_OPENGL.
> 
> AFAIS, you are expecting WITH_OPENGL to be a shell-variable while
> autoconf uses it as a string.
> 
> > Another minor question. Why do we add "x" in:
> > if test x"$WITH_OPENGL" = xtrue; then
> 
> Cf. The "Limitations of Builtins" chapter in info autoconf
> 
> Ralf
> 
> 
> 
>