GNU/Linux X32 ABI patch for OpenMP

[alsoijw]

Summary

In x32 abi defined both x32 and x64 macro flags, so on x32 system uses x64 flags that defines syscall numbers specific on x64. But x32 syscalls are different from x64, so building openmp on x32 platform fails on "#error Wrong code for setaffinity system call." and "#error Wrong code for getaffinity system call." This patch define also x32 flags that allow build both x32 and x64 on same system.

https://lwn.net/Articles/456739/

openmp/runtime/src/kmp_affinity.h

 #error Wrong code for getaffinity system call.
 #endif /* __NR_sched_getaffinity */
 #elif KMP_ARCH_X86_64
+#if __ILP32__
+#ifndef __NR_sched_setaffinity
+#define __NR_sched_setaffinity (0x40000000UL + 203)
+#elif __NR_sched_setaffinity != (0x40000000UL + 203)
+#error Wrong code for setaffinity system call.
+#endif /* __NR_sched_setaffinity */
+#ifndef __NR_sched_getaffinity
+#define __NR_sched_getaffinity (0x40000000UL + 204)
+#elif __NR_sched_getaffinity != (0x40000000UL + 204)
+#error Wrong code for getaffinity system call.
+#endif /* __NR_sched_getaffinity */
+#else
 #ifndef __NR_sched_setaffinity
 #define __NR_sched_setaffinity 203
 #elif __NR_sched_setaffinity != 203

 #elif __NR_sched_getaffinity != 204
 #error Wrong code for getaffinity system call.
 #endif /* __NR_sched_getaffinity */
+#endif
 #elif KMP_ARCH_PPC64
 #ifndef __NR_sched_setaffinity
 #define __NR_sched_setaffinity 222

openmp/runtime/src/kmp_os.h

 #error "Can't determine size_t printf format specifier."
 #endif
 
-#if KMP_ARCH_X86
+#if KMP_ARCH_X86 || __ILP32__
 #define KMP_SIZE_T_MAX (0xFFFFFFFF)
 #else
 #define KMP_SIZE_T_MAX (0xFFFFFFFFFFFFFFFF)