Re: [Mesa3d-dev] Re: [Xpert]mesa assuming glibc 2.2? (Cannot compile 4.1 on RedHat 6.2)

[Marcelo E. M. <mar...@bi...>]

>> Brian Paul <br...@va...> writes:

 > If anyone knows a solution to this I'd like to hear it.

 Sometime ago I submitted a patch for this (#403332).  The comment
 reads:

 | If the use of KATMAI instructions is enabled, on linux it's necessary
 | to have recent kernel headers installed (these are coupled to the C
 | library, so suggesting to place/change a link in /usr/src/ is not
 | advisable). There are two options for it's detection at compile time,
 | one is using LINUX_KERNEL_VERSION, what this patch does, the other is
 | checking for X86_FXSR_MAGIC to be defined. I'm sure Gareth can make a
 | recommendation as to which is better. With either of them, I think
 | it's important to provide the user with an error that at least
 | suggests a course of action (the current one goes along the lines of
 | "magic is not a member of structure sigcontext", IIRC)

 | The patch uses 2.4.0 as a reference point, I'm not really sure when
 | the SSE support was introduced in the kernel, but it's not on the
 | 2.2.18 I looked at.

 The patch, which is not on SF (weird) is basically:

Index: extras/Mesa/src/X86/common_x86.c
===================================================================
RCS file: /cvsroot/dri/xc/xc/extras/Mesa/src/X86/common_x86.c,v
retrieving revision 1.10
diff -u -r1.10 common_x86.c
--- extras/Mesa/src/X86/common_x86.c    2001/02/12 20:42:42     1.10
+++ extras/Mesa/src/X86/common_x86.c    2001/06/05 15:22:50
@@ -88,6 +88,11 @@
 extern void gl_test_os_katmai_exception_support( void );
 
 #if defined(__linux__) && defined(_POSIX_SOURCE)
+#include <linux/version.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0)
+#error "linux headers older than 2.4.0 don't provide support for SSE."
+#endif
+
 static void sigill_handler( int signal, struct sigcontext sc )
 {
    message( "SIGILL, " );

 Granted, it's not the best solution, but it's at least an useful error.
 Some conditionals on the configuration files would do it, too.
 (HAVE_LINUX_2_4_HEADERS, Imakefile style).  The point is, you need 2.4
 kernel headers to compile this.

-- 
Marcelo