[clang] [clang][deps] Implement efficient in-process `ModuleCache` (PR #129751)

LLVM Continuous Integration via cfe-commits cfe-commits at lists.llvm.org
Tue Mar 18 17:59:32 PDT 2025 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `polly-x86_64-linux-shlib-plugin` running on `polly-x86_64-gce2` while building `clang` at step 5 "build".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/75/builds/5629

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

```
Step 5 (build) failure: 'ninja' (failure)
...
[3170/4177] Building CXX object tools/clang/lib/Tooling/Syntax/CMakeFiles/obj.clangToolingSyntax.dir/BuildTree.cpp.o
[3171/4177] Building CXX object tools/clang/lib/Tooling/Syntax/CMakeFiles/obj.clangToolingSyntax.dir/TokenBufferTokenManager.cpp.o
[3172/4177] Building CXX object tools/clang/lib/Tooling/Syntax/CMakeFiles/obj.clangToolingSyntax.dir/Synthesis.cpp.o
[3173/4177] Building CXX object tools/clang/lib/Tooling/Syntax/CMakeFiles/obj.clangToolingSyntax.dir/Nodes.cpp.o
[3174/4177] Building CXX object tools/clang/lib/Tooling/Syntax/CMakeFiles/obj.clangToolingSyntax.dir/Tree.cpp.o
[3175/4177] Building CXX object tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningFilesystem.cpp.o
[3176/4177] Building CXX object tools/clang/lib/Tooling/Syntax/CMakeFiles/obj.clangToolingSyntax.dir/Tokens.cpp.o
[3177/4177] Building CXX object tools/clang/lib/Tooling/Refactoring/CMakeFiles/obj.clangToolingRefactoring.dir/Rename/USRFindingAction.cpp.o
[3178/4177] Building CXX object tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/InProcessModuleCache.cpp.o
[3179/4177] Building CXX object tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningService.cpp.o
FAILED: tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningService.cpp.o 
ccache /usr/bin/c++ -DCLANG_EXPORTS -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/tools/clang/lib/Tooling/DependencyScanning -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/tools/clang/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/llvm/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 -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -fno-strict-aliasing -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningService.cpp.o -MF tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningService.cpp.o.d -o tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningService.cpp.o -c /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning/DependencyScanningService.cpp
In file included from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning/DependencyScanningService.cpp:9:
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningService.h:117:22: error: declaration of ‘clang::tooling::dependencies::ModuleCacheMutexes clang::tooling::dependencies::DependencyScanningService::ModuleCacheMutexes’ changes meaning of ‘ModuleCacheMutexes’ [-fpermissive]
  117 |   ModuleCacheMutexes ModuleCacheMutexes;
      |                      ^~~~~~~~~~~~~~~~~~
In file included from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningService.h:13,
                 from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning/DependencyScanningService.cpp:9:
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/InProcessModuleCache.h:20:8: note: ‘ModuleCacheMutexes’ declared here as ‘struct clang::tooling::dependencies::ModuleCacheMutexes’
   20 | struct ModuleCacheMutexes {
      |        ^~~~~~~~~~~~~~~~~~
[3180/4177] Building CXX object tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningTool.cpp.o
FAILED: tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningTool.cpp.o 
ccache /usr/bin/c++ -DCLANG_EXPORTS -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/tools/clang/lib/Tooling/DependencyScanning -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/tools/clang/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/llvm/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 -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -fno-strict-aliasing -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningTool.cpp.o -MF tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningTool.cpp.o.d -o tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningTool.cpp.o -c /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning/DependencyScanningTool.cpp
In file included from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningTool.h:12,
                 from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning/DependencyScanningTool.cpp:9:
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningService.h:117:22: error: declaration of ‘clang::tooling::dependencies::ModuleCacheMutexes clang::tooling::dependencies::DependencyScanningService::ModuleCacheMutexes’ changes meaning of ‘ModuleCacheMutexes’ [-fpermissive]
  117 |   ModuleCacheMutexes ModuleCacheMutexes;
      |                      ^~~~~~~~~~~~~~~~~~
In file included from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningService.h:13,
                 from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningTool.h:12,
                 from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning/DependencyScanningTool.cpp:9:
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/InProcessModuleCache.h:20:8: note: ‘ModuleCacheMutexes’ declared here as ‘struct clang::tooling::dependencies::ModuleCacheMutexes’
   20 | struct ModuleCacheMutexes {
      |        ^~~~~~~~~~~~~~~~~~
[3181/4177] Building CXX object tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningWorker.cpp.o
FAILED: tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningWorker.cpp.o 
ccache /usr/bin/c++ -DCLANG_EXPORTS -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/tools/clang/lib/Tooling/DependencyScanning -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/tools/clang/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/include -I/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/llvm/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 -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -fno-strict-aliasing -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningWorker.cpp.o -MF tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningWorker.cpp.o.d -o tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningWorker.cpp.o -c /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
In file included from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningWorker.h:16,
                 from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp:9:
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningService.h:117:22: error: declaration of ‘clang::tooling::dependencies::ModuleCacheMutexes clang::tooling::dependencies::DependencyScanningService::ModuleCacheMutexes’ changes meaning of ‘ModuleCacheMutexes’ [-fpermissive]
  117 |   ModuleCacheMutexes ModuleCacheMutexes;
      |                      ^~~~~~~~~~~~~~~~~~
In file included from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningService.h:13,
                 from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/DependencyScanningWorker.h:16,
                 from /home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp:9:
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/clang/include/clang/Tooling/DependencyScanning/InProcessModuleCache.h:20:8: note: ‘ModuleCacheMutexes’ declared here as ‘struct clang::tooling::dependencies::ModuleCacheMutexes’
   20 | struct ModuleCacheMutexes {
      |        ^~~~~~~~~~~~~~~~~~

```

</details>

https://github.com/llvm/llvm-project/pull/129751

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