[clang] [clang][ModulesDriver] Add support for Clang modules to -fmodules-driver (PR #187606)

LLVM Continuous Integration via cfe-commits cfe-commits at lists.llvm.org
Wed Apr 8 17:01:05 PDT 2026 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-aarch64-linux-bootstrap-hwasan` running on `sanitizer-buildbot12` while building `clang` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/55/builds/26476

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

```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/main.py:74: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 96687 tests, 72 workers --
Testing:  0.. 10
FAIL: Clang :: Driver/modules-driver-clang-modules-only.cpp (13642 of 96687)
******************** TEST 'Clang :: Driver/modules-driver-clang-modules-only.cpp' FAILED ********************
Exit Code: -6

Command Output (stdout):
--
# RUN: at line 3
split-file /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/Driver/modules-driver-clang-modules-only.cpp /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp
# executed command: split-file /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/Driver/modules-driver-clang-modules-only.cpp /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp
# note: command had no output on stdout or stderr
# RUN: at line 4
rm -rf /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/modules-cache
# executed command: rm -rf /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/modules-cache
# note: command had no output on stdout or stderr
# RUN: at line 6
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -std=c++23    -fmodules-driver -Rmodules-driver    -fmodules -Rmodule-import    -fmodule-map-file=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/module.modulemap    -fmodules-cache-path=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/modules-cache    -fsyntax-only /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/main.cpp 2>&1    | sed 's:\\\\\?:/:g'    | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck -DPREFIX=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp --check-prefix=CHECK-REMARKS /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/Driver/modules-driver-clang-modules-only.cpp
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -std=c++23 -fmodules-driver -Rmodules-driver -fmodules -Rmodule-import -fmodule-map-file=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/module.modulemap -fmodules-cache-path=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/modules-cache -fsyntax-only /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/main.cpp
# note: command had no output on stdout or stderr
# error: command failed with exit status: -6
# executed command: sed 's:\\\\\?:/:g'
# note: command had no output on stdout or stderr
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck -DPREFIX=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp --check-prefix=CHECK-REMARKS /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/Driver/modules-driver-clang-modules-only.cpp
# note: command had no output on stdout or stderr

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
Slowest Tests:
--------------------------------------------------------------------------
51.11s: LLVM :: tools/llvm-exegesis/AArch64/all-opcodes.test
36.35s: LLVM :: CodeGen/AMDGPU/sched-group-barrier-pipeline-solver.mir
32.09s: Clang :: Preprocessor/riscv-target-features.c
31.84s: Clang :: Driver/arm-cortex-cpus-1.c
31.45s: Clang :: Driver/arm-cortex-cpus-2.c
30.77s: LLVM :: CodeGen/AMDGPU/amdgcn.bitcast.1024bit.ll
28.12s: Clang :: CodeGen/X86/avx-builtins.c
28.05s: Clang :: CodeGen/X86/sse2-builtins.c
27.38s: Clang :: OpenMP/target_update_codegen.cpp
Step 11 (stage2/hwasan check) failure: stage2/hwasan check (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:569: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/utils/lit/lit/main.py:74: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 96687 tests, 72 workers --
Testing:  0.. 10
FAIL: Clang :: Driver/modules-driver-clang-modules-only.cpp (13642 of 96687)
******************** TEST 'Clang :: Driver/modules-driver-clang-modules-only.cpp' FAILED ********************
Exit Code: -6

Command Output (stdout):
--
# RUN: at line 3
split-file /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/Driver/modules-driver-clang-modules-only.cpp /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp
# executed command: split-file /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/Driver/modules-driver-clang-modules-only.cpp /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp
# note: command had no output on stdout or stderr
# RUN: at line 4
rm -rf /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/modules-cache
# executed command: rm -rf /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/modules-cache
# note: command had no output on stdout or stderr
# RUN: at line 6
/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -std=c++23    -fmodules-driver -Rmodules-driver    -fmodules -Rmodule-import    -fmodule-map-file=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/module.modulemap    -fmodules-cache-path=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/modules-cache    -fsyntax-only /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/main.cpp 2>&1    | sed 's:\\\\\?:/:g'    | /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck -DPREFIX=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp --check-prefix=CHECK-REMARKS /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/Driver/modules-driver-clang-modules-only.cpp
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/clang -std=c++23 -fmodules-driver -Rmodules-driver -fmodules -Rmodule-import -fmodule-map-file=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/module.modulemap -fmodules-cache-path=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/modules-cache -fsyntax-only /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp/main.cpp
# note: command had no output on stdout or stderr
# error: command failed with exit status: -6
# executed command: sed 's:\\\\\?:/:g'
# note: command had no output on stdout or stderr
# executed command: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/FileCheck -DPREFIX=/home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/tools/clang/test/Driver/Output/modules-driver-clang-modules-only.cpp.tmp --check-prefix=CHECK-REMARKS /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/clang/test/Driver/modules-driver-clang-modules-only.cpp
# note: command had no output on stdout or stderr

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
Slowest Tests:
--------------------------------------------------------------------------
51.11s: LLVM :: tools/llvm-exegesis/AArch64/all-opcodes.test
36.35s: LLVM :: CodeGen/AMDGPU/sched-group-barrier-pipeline-solver.mir
32.09s: Clang :: Preprocessor/riscv-target-features.c
31.84s: Clang :: Driver/arm-cortex-cpus-1.c
31.45s: Clang :: Driver/arm-cortex-cpus-2.c
30.77s: LLVM :: CodeGen/AMDGPU/amdgcn.bitcast.1024bit.ll
28.12s: Clang :: CodeGen/X86/avx-builtins.c
28.05s: Clang :: CodeGen/X86/sse2-builtins.c
27.38s: Clang :: OpenMP/target_update_codegen.cpp

```

</details>

https://github.com/llvm/llvm-project/pull/187606

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