compiling OpenMP programs

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Hello, I get an error compiling a simple OpenMP program. Could you please help?

vinodt@m2000host0:/localdata/vinod/Polygeist/Heat3DOpenMP$ mlir-clang -I../llvm-project/clang/lib/Headers main.c
mlir-clang: /localdata/vinod/Polygeist/lib/polygeist/Passes/LoopRestructure.cpp:647: void {anonymous}::LoopRestructure::runOnRegion(mlir::DominanceInfo&, mlir::Region&): Assertion `loop.before().getBlocks().size() == 1' failed.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
Stack dump:
0. Program arguments: mlir-clang -I ../llvm-project/clang/lib/Headers main.c
#0 0x00005582c9fca00a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /localdata/vinod/Polygeist/llvm-project/llvm/lib/Support/Unix/Signals.inc:565:0
#1 0x00005582c9fca0c1 PrintStackTraceSignalHandler(void*) /localdata/vinod/Polygeist/llvm-project/llvm/lib/Support/Unix/Signals.inc:632:0
#2 0x00005582c9fc7d75 llvm::sys::RunSignalHandlers() /localdata/vinod/Polygeist/llvm-project/llvm/lib/Support/Signals.cpp:97:0
#3 0x00005582c9fc998b SignalHandler(int) /localdata/vinod/Polygeist/llvm-project/llvm/lib/Support/Unix/Signals.inc:407:0
#4 0x00007fe4c613b980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
#5 0x00007fe4c4decfb7 raise /build/glibc-S9d2JN/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#6 0x00007fe4c4dee921 abort /build/glibc-S9d2JN/glibc-2.27/stdlib/abort.c:81:0
#7 0x00007fe4c4dde48a __assert_fail_base /build/glibc-S9d2JN/glibc-2.27/assert/assert.c:89:0
#8 0x00007fe4c4dde502 (/lib/x86_64-linux-gnu/libc.so.6+0x30502)
#9 0x00005582ca899740 (anonymous namespace)::LoopRestructure::runOnRegion(mlir::DominanceInfo&, mlir::Region&) /localdata/vinod/Polygeist/lib/polygeist/Passes/LoopRestructure.cpp:648:0
#10 0x00005582ca8962d9 (anonymous namespace)::LoopRestructure::runOnFunction() /localdata/vinod/Polygeist/lib/polygeist/Passes/LoopRestructure.cpp:283:0
#11 0x00005582ca816edf mlir::FunctionPass::runOnOperation() /localdata/vinod/Polygeist/llvm-project/mlir/include/mlir/Pass/Pass.h:395:0
#12 0x00005582ccdc53d9 mlir::detail::OpToOpPassAdaptor::run(mlir::Pass*, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int) /localdata/vinod/Polygeist/llvm-project/mlir/lib/Pass/Pass.cpp:393:0
#13 0x00005582ccdc56ab mlir::detail::OpToOpPassAdaptor::runPipeline(llvm::iterator_range >*, mlir::Pass> >, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int, mlir::PassInstrumentor*, mlir::PassInstrumentation::PipelineParentInfo const*) /localdata/vinod/Polygeist/llvm-project/mlir/lib/Pass/Pass.cpp:452:0
#14 0x00005582ccdc611d mlir::detail::OpToOpPassAdaptor::runOnOperationImpl(bool) /localdata/vinod/Polygeist/llvm-project/mlir/lib/Pass/Pass.cpp:548:0
#15 0x00005582ccdc5e71 mlir::detail::OpToOpPassAdaptor::runOnOperation(bool) /localdata/vinod/Polygeist/llvm-project/mlir/lib/Pass/Pass.cpp:530:0
#16 0x00005582ccdc53ba mlir::detail::OpToOpPassAdaptor::run(mlir::Pass*, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int) /localdata/vinod/Polygeist/llvm-project/mlir/lib/Pass/Pass.cpp:390:0
#17 0x00005582ccdc56ab mlir::detail::OpToOpPassAdaptor::runPipeline(llvm::iterator_range >*, mlir::Pass> >, mlir::Operation*, mlir::AnalysisManager, bool, unsigned int, mlir::PassInstrumentor*, mlir::PassInstrumentation::PipelineParentInfo const*) /localdata/vinod/Polygeist/llvm-project/mlir/lib/Pass/Pass.cpp:452:0
#18 0x00005582ccdc6da0 mlir::PassManager::runPasses(mlir::Operation*, mlir::AnalysisManager) /localdata/vinod/Polygeist/llvm-project/mlir/lib/Pass/Pass.cpp:697:0
#19 0x00005582ccdc6be8 mlir::PassManager::run(mlir::Operation*) /localdata/vinod/Polygeist/llvm-project/mlir/lib/Pass/Pass.cpp:676:0
#20 0x00005582c843eb96 main /localdata/vinod/Polygeist/tools/mlir-clang/mlir-clang.cc:447:0
#21 0x00007fe4c4dcfbf7 __libc_start_main /build/glibc-S9d2JN/glibc-2.27/csu/../csu/libc-start.c:344:0
#22 0x00005582c840fb4a _start (/localdata/vinod/Polygeist/build/bin/mlir-clang+0x858b4a)

Reproduce the failure with the reported mlir-clang command and the example main.c, then inspect lib/polygeist/Passes/LoopRestructure.cpp around lines 647-648 and the caller at line 283. Determine why the assertion is reached and add a regression case if the existing tests provide a suitable entry point. Done means the reported program no longer aborts during compilation and the regression test passes.

Written by the indexing model from the issue text.