[clang] [compiler-rt] [llvm] Skipping host target exports during cross-compilation (PR #209922)

Fri Jul 17 22:53:51 PDT 2026

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-aarch64-sharedlibs` running on `linaro-flang-aarch64-sharedlibs` while building `clang,compiler-rt,llvm,runtimes` at step 7 "test-build-unified-tree-check-flang-rt".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/80/builds/23559

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (test-build-unified-tree-check-flang-rt) failure: test (failure)
...
-- Configuring done (2.9s)
-- Generating done (0.6s)
-- Build files have been written to: /home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/build/runtimes/runtimes-bins
7.105 [0/1/4] cd /home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/build/runtimes/runtimes-bins && /usr/local/bin/cmake --build /home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/build/runtimes/runtimes-bins/ --target check-flang-rt --config Release
0.089 [43/3/1] Generating Fortran dyndep file flang-rt/lib/runtime/CMakeFiles/flang-rt-mod.dir/Fortran.dd
6.817 [40/5/2] Building CXX object flang-rt/lib/Testing/CMakeFiles/NonGTestTesting.dir/home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/llvm-project/flang/lib/Testing/testing.cpp.o
7.062 [5/39/3] Building CXX object flang-rt/lib/Testing/CMakeFiles/NonGTestTesting.dir/home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/llvm-project/flang/lib/Testing/fp-testing.cpp.o
7.174 [4/39/4] Linking CXX static library flang-rt/lib/Testing/libNonGTestTesting.a
7.779 [4/38/5] Building CXX object flang-rt/unittests/Evaluate/CMakeFiles/ISO-Fortran-binding.test.dir/ISO-Fortran-binding.cpp.o
8.023 [3/38/6] Linking CXX executable flang-rt/unittests/Evaluate/ISO-Fortran-binding.test
FAILED: flang-rt/unittests/Evaluate/ISO-Fortran-binding.test 
: && /home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/build/./bin/clang++ --target=aarch64-unknown-linux-gnu -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Xclang -fno-pch-timestamp -O3 -DNDEBUG  flang-rt/unittests/Evaluate/CMakeFiles/ISO-Fortran-binding.test.dir/ISO-Fortran-binding.cpp.o -o flang-rt/unittests/Evaluate/ISO-Fortran-binding.test  flang-rt/lib/Testing/libNonGTestTesting.a  /home/tcwg-buildbot/worker/flang-aarch64-sharedlibs/build/lib/clang/24/lib/aarch64-unknown-linux-gnu/libflang_rt.runtime.a  -lLLVMSupport && :
/usr/bin/ld: cannot find -lLLVMSupport: No such file or directory
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
9.146 [3/37/7] Building CXX object flang-rt/unittests/Evaluate/CMakeFiles/reshape.test.dir/reshape.cpp.o
14.633 [3/36/8] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/AccessTest.cpp.o
14.701 [3/35/9] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Exceptions.cpp.o
15.650 [3/34/10] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Assign.cpp.o
16.306 [3/33/11] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Ragged.cpp.o
16.450 [3/32/12] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/CrashHandlerFixture.cpp.o
17.659 [3/31/13] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/TypeCode.cpp.o
17.757 [3/30/14] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/RuntimeCrashTest.cpp.o
18.309 [3/29/15] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/BufferTest.cpp.o
18.847 [3/28/16] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Matmul.cpp.o
18.999 [3/27/17] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/LogicalFormatTest.cpp.o
19.413 [3/26/18] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/InputExtensions.cpp.o
19.975 [3/25/19] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Random.cpp.o
20.103 [3/24/20] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Namelist.cpp.o
21.347 [3/23/21] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Stop.cpp.o
21.586 [3/22/22] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Time.cpp.o
22.268 [3/21/23] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/ArrayConstructor.cpp.o
22.448 [3/20/24] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Numeric.cpp.o
23.018 [3/19/25] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Derived.cpp.o
23.200 [3/18/26] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Inquiry.cpp.o
23.587 [3/17/27] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Support.cpp.o
23.638 [3/16/28] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/ExternalIOTest.cpp.o
24.056 [3/15/29] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/LeadingZeroTest.cpp.o
24.132 [3/14/30] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Allocatable.cpp.o
24.312 [3/13/31] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/TemporaryStack.cpp.o
24.826 [3/12/32] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/MiscIntrinsic.cpp.o
25.004 [3/11/33] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Pointer.cpp.o
27.028 [3/10/34] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/MatmulTranspose.cpp.o
27.694 [3/9/35] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/ListInputTest.cpp.o
28.743 [3/8/36] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/NumericalFormatTest.cpp.o
28.783 [3/7/37] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/CommandTest.cpp.o
29.252 [3/6/38] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Complex.cpp.o
29.406 [3/5/39] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Transformational.cpp.o
31.245 [3/4/40] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Format.cpp.o
38.635 [3/3/41] Building CXX object flang-rt/unittests/Runtime/CMakeFiles/RuntimeTests.dir/Descriptor.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/209922