The local threads don't work on RedHat 5.1 Sparc Linux (with glibc2).

I suspect it's because glibc2's setjmp/longjmp (Sparc version) does
not allow us to modify the jmp_buf.  So I added some comments and
a #error directive to force the build to fail.

1 files changed, 18 insertions, 0 deletions

diff --git a/pr/include/md/_linux.h b/pr/include/md/_linux.h
index 548d4a92..32305c2f 100644
--- a/pr/include/md/_linux.h
+++ b/pr/include/md/_linux.h
@@ -129,11 +129,29 @@ extern void _MD_CleanupBeforeExit(void);
 
 #elif defined(__sparc__)
 /* Sparc */
+#if defined(__GLIBC__) && __GLIBC__ >= 2
+/*
+ * FIXME: The setjmp/longjmp approach works in Red Hat 4.2 but
+ * not in Red Hat 5.1 for Linux/Sparc.  We should talk to the
+ * maintainer of Linux/Sparc glibc2 about this.  Or we can write
+ * assembly code to save and restore thread contexts.  Before
+ * this problem is solved, you can build the pthreads version.
+ * Set the environment variable USE_PTHREADS to 1 before you
+ * build.
+ */
+#error "Please see comments in pr/include/md/_linux.h"
+#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[JB_SP]
+#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[JB_FP] = val)
+#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
+#define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[JB_FP])
+#define _MD_SP_TYPE int
+#else
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[0].__fp
 #define _MD_SET_FP(_t, val)
 #define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
 #define _MD_GET_FP_PTR(_t) ((void *) 0)
 #define _MD_SP_TYPE __ptr_t
+#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 
 #elif defined(__i386__)
 /* Intel based Linux */