[OFFLOAD] Remove weak from __kmpc_* calls and gather them in one header (llvm#164613)

Follow-up from llvm#162652

---------

Co-authored-by: Michael Klemm <[email protected]>

Author: 2 people

offload/include/OffloadPolicy.h

@@ -22,8 +22,6 @@ enum kmp_target_offload_kind_t {
   tgt_mandatory = 2
 };
 
-extern "C" int __kmpc_get_target_offload(void) __attribute__((weak));
-
 class OffloadPolicy {
 
   OffloadPolicy(PluginManager &PM) {

offload/include/OpenMP/InternalTypes.h

@@ -70,10 +70,23 @@ typedef struct kmp_task {
   int32_t part_id;
 } kmp_task_t;
 
-int32_t __kmpc_global_thread_num(void *) __attribute__((weak));
-bool __kmpc_omp_has_task_team(int32_t gtid) __attribute__((weak));
-void **__kmpc_omp_get_target_async_handle_ptr(int32_t gtid)
-    __attribute__((weak));
+// Implemented in libomp, they are called from within __tgt_* functions.
+int32_t __kmpc_global_thread_num(void *);
+bool __kmpc_omp_has_task_team(int32_t gtid);
+void **__kmpc_omp_get_target_async_handle_ptr(int32_t gtid);
+int __kmpc_get_target_offload(void);
+kmp_task_t *
+__kmpc_omp_target_task_alloc(ident_t *loc_ref, int32_t gtid, int32_t flags,
+                             size_t sizeof_kmp_task_t, size_t sizeof_shareds,
+                             kmp_routine_entry_t task_entry, int64_t device_id);
+int32_t __kmpc_omp_task_with_deps(ident_t *loc_ref, int32_t gtid,
+                                  kmp_task_t *new_task, int32_t ndeps,
+                                  kmp_depend_info_t *dep_list,
+                                  int32_t ndeps_noalias,
+                                  kmp_depend_info_t *noalias_dep_list);
+void __kmpc_omp_wait_deps(ident_t *loc_ref, int32_t gtid, int32_t ndeps,
+                          kmp_depend_info_t *dep_list, int32_t ndeps_noalias,
+                          kmp_depend_info_t *noalias_dep_list);
 
 /**
  * The argument set that is passed from asynchronous memory copy to block

offload/include/OpenMP/omp.h

@@ -40,7 +40,7 @@ typedef void *omp_depend_t;
 /// API declarations
 ///{
 
-int omp_get_default_device(void) __attribute__((weak));
+int omp_get_default_device(void);
 
 ///}
 

offload/libomptarget/OpenMP/API.cpp

@@ -48,29 +48,6 @@ void *targetLockExplicit(void *HostPtr, size_t Size, int DeviceNum,
                          const char *Name);
 void targetUnlockExplicit(void *HostPtr, int DeviceNum, const char *Name);
 
-// Implemented in libomp, they are called from within __tgt_* functions.
-extern "C" {
-int __kmpc_get_target_offload(void) __attribute__((weak));
-kmp_task_t *__kmpc_omp_task_alloc(ident_t *loc_ref, int32_t gtid, int32_t flags,
-                                  size_t sizeof_kmp_task_t,
-                                  size_t sizeof_shareds,
-                                  kmp_routine_entry_t task_entry)
-    __attribute__((weak));
-
-kmp_task_t *
-__kmpc_omp_target_task_alloc(ident_t *loc_ref, int32_t gtid, int32_t flags,
-                             size_t sizeof_kmp_task_t, size_t sizeof_shareds,
-                             kmp_routine_entry_t task_entry, int64_t device_id)
-    __attribute__((weak));
-
-int32_t __kmpc_omp_task_with_deps(ident_t *loc_ref, int32_t gtid,
-                                  kmp_task_t *new_task, int32_t ndeps,
-                                  kmp_depend_info_t *dep_list,
-                                  int32_t ndeps_noalias,
-                                  kmp_depend_info_t *noalias_dep_list)
-    __attribute__((weak));
-}
-
 EXTERN int omp_get_num_devices(void) {
   TIMESCOPE();
   OMPT_IF_BUILT(ReturnAddressSetterRAII RA(__builtin_return_address(0)));

offload/libomptarget/OpenMP/InteropAPI.cpp

@@ -18,14 +18,6 @@
 #include <cstdlib>
 #include <cstring>
 
-extern "C" {
-
-void __kmpc_omp_wait_deps(ident_t *loc_ref, int32_t gtid, int32_t ndeps,
-                          kmp_depend_info_t *dep_list, int32_t ndeps_noalias,
-                          kmp_depend_info_t *noalias_dep_list);
-
-} // extern "C"
-
 namespace {
 omp_interop_rc_t getPropertyErrorType(omp_interop_property_t Property) {
   switch (Property) {