On Fri, Feb 21, 2003 at 03:35:35PM -0700, Marc Aurele La France wrote:
>On Fri, 21 Feb 2003, David Dawes wrote:
>
>> >> >The setjmp/longjmp fix in
>> >> > xc/programs/Xserver/hw/xfree86/loader/xf86sym.c
>> >> >and xc/programs/Xserver/hw/xfree86/xf86cfg/loadmod.c
>> >> >doesn't compile in
>> >> > RedHat 6.2 egcs-2.91.66
>
>> >> >It works fine with
>> >> > Red Hat 7.3 gcc 2.96
>> >> >and
>> >> > Red Hat 8.0 gcc (GCC) 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
>
>> >> It looks like RH 6.2 and earlier (i.e. glibc before 2.2) uses a macro for
>> >> setjmp():
>
>> >> extern int __sigsetjmp __P ((jmp_buf __env, int __savemask));
>
>> >> #ifndef __FAVOR_BSD
>> >> /* Set ENV to the current position and return 0, not saving the signal mask.
>> >> This is just like `sigsetjmp (ENV, 0)'.
>> >> The ISO C standard says `setjmp' is a macro. */
>> >> # define setjmp(env) __sigsetjmp ((env), 0)
>> >> #else
>> >> /* We are in 4.3 BSD-compatibility mode in which `setjmp'
>> >> saves the signal mask like `sigsetjmp (ENV, 1)'. */
>> >> # define setjmp(env) __sigsetjmp ((env), 1)
>> >> #endif /* Favor BSD. */
>
>> >> Harbison & Steele also refers to "the macro setjump" and "the function
>> >> longjmp".
>
>> >> This certainly complicates things.
>
>> >> A couple of possibilities:
>
>> >> 1. Include <setjmp.h> directly into modules that need it, ensure that the
>> >> necessary (platform-specific) entry points are exported, and accept that
>> >> modules that use it are not OS-neutral.
>
>> >> 2. Provide aliases for the actual functions uses on the platforms we support,
>> >> and come up with a macro for xf86setjmp() that calls the correct one in
>> >> the correct way, probably by first querying a function in the core
>> >> server for which way to use.
>
>> >Just another data point: libGLU compilation on such systems fails also.
>
>> libGLU builds OK on the RH 6.2 system I've been looking into this with.
>> It does do some things with setjmp (using inlined functions).
>
>How? I have been unable to get libGLU to compile on a system that
>#define's setjmp & friends as macros.
It "just works" for me on RH 5.2 (glibc 2.0) and RH 6.2 (glibc 2.1) .
It uses inline'd functions:
inline int
mysetjmp( JumpBuffer *j )
{
return ::setjmp( j->buf );
}
Maybe it depends on the g++ version?
I'm not sure why libGLU does this in the libnurbs code. In the libtess
code it just uses setjmp/longjmp directly. (Maybe because the former is
C++ and the latter C?)
David
--
David Dawes
Release Engineer/Architect The XFree86 Project
www.XFree86.org/~dawes
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