[llvm-bugs] [Bug 41966] New: Mismatching signature on __tgt_target calls for 32bit hosts

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41966

            Bug ID: 41966
           Summary: Mismatching signature on __tgt_target calls for 32bit
                    hosts
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: bucyril at ee.ethz.ch
                CC: llvm-bugs at lists.llvm.org

The signature used for the __tgt_target call used by Clang is:
int32_t __tgt_target(int64_t device_id, void *host_ptr, int32_t arg_num, void
**args_base, void **args, size_t *arg_sizes, int64_t *arg_types);

In CGOpenMPRuntime.cpp, line 2235:
https://github.com/llvm-mirror/clang/blob/1353fe814c52fd2eb0324cea1099ed79703896ff/lib/CodeGen/CGOpenMPRuntime.cpp#L2235

The signature used in libomptarget is:
int32_t __tgt_target(int64_t device_id, void *host_ptr, int32_t arg_num, void
**args_base, void **args, int64_t *arg_sizes, int64_t *arg_types);

in interface.cpp, line 217:
https://github.com/llvm-mirror/openmp/blob/665d5c5112ab6ee1cba56733ec3a1b37e86aa55b/libomptarget/src/interface.cpp#L217

These differ for 32bit hosts in the argument `arg_sizes`, because Clang
generates `size_t*`, while libomptarget expects `int64_t*`. This results in
unreasonably large allocations and a subsequent segfault when more than one
argument is used for the offloaded call.

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