[clang] [llvm] [llvm][clang] Allocate a new stack instead of spawning a new thread to get more stack space (PR #133173)

Tue Apr 15 12:23:46 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `arc-builder` running on `arc-worker` while building `clang,llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/3/builds/14596

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
...
627.114 [168/18/828] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ModRefTest.cpp.o
628.574 [167/18/829] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/OptimizedStructLayoutTest.cpp.o
628.876 [166/18/830] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/NativeFormatTests.cpp.o
629.316 [165/18/831] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/PerThreadBumpPtrAllocatorTest.cpp.o
630.102 [164/18/832] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/CommandLineTest.cpp.o
630.208 [163/18/833] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/MemoryBufferTest.cpp.o
630.335 [162/18/834] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ProcessTest.cpp.o
630.496 [161/18/835] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/MemoryTest.cpp.o
630.802 [160/18/836] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ParallelTest.cpp.o
631.251 [159/18/837] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ProgramStackTest.cpp.o
FAILED: unittests/Support/CMakeFiles/SupportTests.dir/ProgramStackTest.cpp.o 
/usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Iunittests/Support -I/buildbot/worker/arc-folder/llvm-project/llvm/unittests/Support -Iinclude -I/buildbot/worker/arc-folder/llvm-project/llvm/include -I/buildbot/worker/arc-folder/llvm-project/third-party/unittest/googletest/include -I/buildbot/worker/arc-folder/llvm-project/third-party/unittest/googlemock/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG  -Wno-dangling-else -Wno-variadic-macros -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -Wno-suggest-override -std=c++17 -MD -MT unittests/Support/CMakeFiles/SupportTests.dir/ProgramStackTest.cpp.o -MF unittests/Support/CMakeFiles/SupportTests.dir/ProgramStackTest.cpp.o.d -o unittests/Support/CMakeFiles/SupportTests.dir/ProgramStackTest.cpp.o -c /buildbot/worker/arc-folder/llvm-project/llvm/unittests/Support/ProgramStackTest.cpp
/buildbot/worker/arc-folder/llvm-project/llvm/unittests/Support/ProgramStackTest.cpp: In member function 'virtual void ProgramStackTest_runOnNewStack_Test::TestBody()':
/buildbot/worker/arc-folder/llvm-project/llvm/unittests/Support/ProgramStackTest.cpp:33:55: error: call of overloaded 'runOnNewStack(int, llvm::function_ref<void(int&)>, int&)' is ambiguous
   33 |   runOnNewStack(0, function_ref<void(int &)>(func2), A);
      |                                                       ^
In file included from /buildbot/worker/arc-folder/llvm-project/llvm/unittests/Support/ProgramStackTest.cpp:9:
/buildbot/worker/arc-folder/llvm-project/llvm/include/llvm/Support/ProgramStack.h:48:3: note: candidate: 'R llvm::runOnNewStack(unsigned int, llvm::function_ref<Ret(Params ...)>, Ts&& ...) [with R = void; Ts = {int&}]'
   48 | R runOnNewStack(unsigned StackSize, function_ref<R(Ts...)> Fn, Ts &&...Args) {
      |   ^~~~~~~~~~~~~
/buildbot/worker/arc-folder/llvm-project/llvm/include/llvm/Support/ProgramStack.h:55:6: note: candidate: 'void llvm::runOnNewStack(unsigned int, llvm::function_ref<void(Ts ...)>, Ts&& ...) [with Ts = {int&}]'
   55 | void runOnNewStack(unsigned StackSize, function_ref<void(Ts...)> Fn,
      |      ^~~~~~~~~~~~~
631.433 [159/17/838] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/JSONTest.cpp.o
631.444 [159/16/839] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/FormatVariadicTest.cpp.o
631.705 [159/15/840] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ErrorTest.cpp.o
631.809 [159/14/841] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/RecyclerTest.cpp.o
631.863 [159/13/842] Building CXX object unittests/ProfileData/CMakeFiles/ProfileDataTests.dir/InstrProfTest.cpp.o
632.509 [159/12/843] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ReverseIterationTest.cpp.o
632.676 [159/11/844] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ReplaceFileTest.cpp.o
632.739 [159/10/845] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/HashBuilderTest.cpp.o
632.960 [159/9/846] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/RegexTest.cpp.o
632.978 [159/8/847] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ProgramTest.cpp.o
633.010 [159/7/848] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/RISCVAttributeParserTest.cpp.o
634.283 [159/6/849] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/MathExtrasTest.cpp.o
634.293 [159/5/850] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/MustacheTest.cpp.o
635.618 [159/4/851] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ScopedPrinterTest.cpp.o
635.690 [159/3/852] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/ScaledNumberTest.cpp.o
641.544 [159/2/853] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/Path.cpp.o
643.429 [159/1/854] Building CXX object unittests/SandboxIR/CMakeFiles/SandboxIRTests.dir/SandboxIRTest.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/133173