[OPENMP] Add Hurd support

[sthibaul]

Summary

This adds Hurd support to the openmp runtime by just enabling appropriate code pieces.

[AndreyChurbanov]

Please submit the patch with full sources, so that more code around changes could be easily viewed.

[sthibaul]

Here it is

[krytarowski]

runtime/src/z_Linux_util.cpp

1958

I would update this 'Linux' in comment and make it more generic.

[krytarowski]

runtime/src/z_Linux_util.cpp

448

I would drop this comment.

[sthibaul]

(I cannot commit this myself)

runtime/src/kmp.h

 /* TODO: tune for KMP_OS_NETBSD */
 #define KMP_INIT_WAIT 1024U /* initial number of spin-tests   */
 #define KMP_NEXT_WAIT 512U /* susequent number of spin-tests */
+#elif KMP_OS_HURD
+/* TODO: tune for KMP_OS_HURD */
+#define KMP_INIT_WAIT 1024U /* initial number of spin-tests   */
+#define KMP_NEXT_WAIT 512U /* susequent number of spin-tests */
 #endif
 
 #if KMP_ARCH_X86 || KMP_ARCH_X86_64

runtime/src/kmp_ftn_entry.h

 #else
   int gtid;
 
-#if KMP_OS_DARWIN || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#if KMP_OS_DARWIN || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_HURD
   gtid = __kmp_entry_gtid();
 #elif KMP_OS_WINDOWS
   if (!__kmp_init_parallel ||

runtime/src/kmp_platform.h

 #define KMP_OS_DARWIN 0
 #define KMP_OS_WINDOWS 0
 #define KMP_OS_CNK 0
+#define KMP_OS_HURD 0
 #define KMP_OS_UNIX 0 /* disjunction of KMP_OS_LINUX, KMP_OS_DARWIN etc. */
 
 #ifdef _WIN32

 #define KMP_OS_CNK 1
 #endif
 
+#if (defined __GNU__)
+#undef KMP_OS_HURD
+#define KMP_OS_HURD 1
+#endif
+
 #if (1 !=                                                                      \
      KMP_OS_LINUX + KMP_OS_FREEBSD + KMP_OS_NETBSD + KMP_OS_DARWIN +           \
-         KMP_OS_WINDOWS)
+         KMP_OS_WINDOWS + KMP_OS_HURD)
 #error Unknown OS
 #endif
 
-#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_DARWIN
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_DARWIN || KMP_OS_HURD
 #undef KMP_OS_UNIX
 #define KMP_OS_UNIX 1
 #endif

runtime/src/kmp_runtime.cpp

 #if KMP_ARCH_X86_64 || KMP_ARCH_PPC64 || KMP_ARCH_AARCH64 || KMP_ARCH_MIPS64
 
 #if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_WINDOWS ||       \
-    KMP_OS_DARWIN
+    KMP_OS_DARWIN || KMP_OS_HURD
 
     int teamsize_cutoff = 4;
 

 
 #elif KMP_ARCH_X86 || KMP_ARCH_ARM || KMP_ARCH_AARCH || KMP_ARCH_MIPS
 
-#if KMP_OS_LINUX || KMP_OS_WINDOWS
+#if KMP_OS_LINUX || KMP_OS_WINDOWS || KMP_OS_HURD
 
     // basic tuning
 

runtime/src/thirdparty/ittnotify/ittnotify_static.c

 
 #endif
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
 
+
 #ifndef LIB_VAR_NAME
 #if ITT_ARCH==ITT_ARCH_IA32 || ITT_ARCH==ITT_ARCH_ARM || ITT_ARCH==ITT_ARCH_MIPS
 #define LIB_VAR_NAME INTEL_LIBITTNOTIFY32

runtime/src/z_Linux_util.cpp

    determined exactly, FALSE if incremental refinement is necessary. */
 static kmp_int32 __kmp_set_stack_info(int gtid, kmp_info_t *th) {
   int stack_data;
-#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_HURD
   /* Linux* OS only -- no pthread_getattr_np support on OS X* */
   pthread_attr_t attr;
   int status;

   sigset_t new_set, old_set;
 #endif /* KMP_BLOCK_SIGNALS */
   void *exit_val;
-#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_HURD
   void *volatile padding = 0;
 #endif
   int gtid;

 
   int r = 0;
 
-#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_NETBSD || KMP_OS_HURD
 
   r = sysconf(_SC_NPROCESSORS_ONLN);
 

   int found = 0;
   int rc;
 
-#if KMP_OS_LINUX || KMP_OS_FREEBSD
+#if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_HURD
 
   /* On Linux* OS, read the /proc/<pid>/maps pseudo-file to get all the address
      ranges mapped into the address space. */