Clang++ crashes when using pointer-to-member pointers from separate named modules

[JoniHelen]

clang++ crashes while building CMake project with c++ modules using pointer-to-member pointers with the following stack trace:

Stack dump:
0.	Program arguments: D:\\LLVM\\bin\\clang++.exe -cc1 -triple x86_64-pc-windows-msvc19.41.34120 -emit-obj -mincremental-linker-compatible -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name bar.ixx -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -gno-column-info -gcodeview -debug-info-kind=constructor -fdebug-compilation-dir=D:\\Algotask3\\cmake-build-debug -object-file-name=D:\\Algotask3\\cmake-build-debug\\CMakeFiles\\ptr_bug.dir\\bar.ixx.obj -fcoverage-compilation-dir=D:\\Algotask3\\cmake-build-debug -resource-dir D:\\LLVM\\lib\\clang\\19 -O0 -std=gnu++23 -fdeprecated-macro -ferror-limit 19 -fno-use-cxa-atexit -fms-extensions -fms-compatibility -fms-compatibility-version=19.41.34120 -fno-implicit-modules -fmodule-file=foo=CMakeFiles/ptr_bug.dir/foo.pcm -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions --dependent-lib=msvcrtd -gcodeview -faddrsig -o CMakeFiles/ptr_bug.dir/bar.ixx.obj -x pcm CMakeFiles/ptr_bug.dir/bar.pcm
1.	<eof> parser at end of file
2.	D:\Algotask3\bar.ixx:5:14: LLVM IR generation of declaration 'Bar'
Exception Code: 0xC0000005
 #0 0x00007ff6275d6e30 (D:\LLVM\bin\clang++.exe+0xa6e30)
 #1 0x00007ff62920c356 (D:\LLVM\bin\clang++.exe+0x1cdc356)
 #2 0x00007ff628757dd0 (D:\LLVM\bin\clang++.exe+0x1227dd0)
 #3 0x00007ff628bb853a (D:\LLVM\bin\clang++.exe+0x168853a)
 #4 0x00007ff6283e03ec (D:\LLVM\bin\clang++.exe+0xeb03ec)
 #5 0x00007ff6283dc4ca (D:\LLVM\bin\clang++.exe+0xeac4ca)
 #6 0x00007ff628756d4f (D:\LLVM\bin\clang++.exe+0x1226d4f)
 #7 0x00007ff628755948 (D:\LLVM\bin\clang++.exe+0x1225948)
 #8 0x00007ff629736699 (D:\LLVM\bin\clang++.exe+0x2206699)
 #9 0x00007ff629732ce0 (D:\LLVM\bin\clang++.exe+0x2202ce0)
#10 0x00007ff6297326c2 (D:\LLVM\bin\clang++.exe+0x22026c2)
#11 0x00007ff629732651 (D:\LLVM\bin\clang++.exe+0x2202651)
#12 0x00007ff6297309e8 (D:\LLVM\bin\clang++.exe+0x22009e8)
#13 0x00007ff62877a752 (D:\LLVM\bin\clang++.exe+0x124a752)
#14 0x00007ff62910faec (D:\LLVM\bin\clang++.exe+0x1bdfaec)
#15 0x00007ff6290fe816 (D:\LLVM\bin\clang++.exe+0x1bce816)
#16 0x00007ff62a525af4 (D:\LLVM\bin\clang++.exe+0x2ff5af4)
#17 0x00007ff62992565e (D:\LLVM\bin\clang++.exe+0x23f565e)
#18 0x00007ff629094f2a (D:\LLVM\bin\clang++.exe+0x1b64f2a)
#19 0x00007ff627af0f21 (D:\LLVM\bin\clang++.exe+0x5c0f21)
#20 0x00007ff627af0ab2 (D:\LLVM\bin\clang++.exe+0x5c0ab2)
#21 0x00007ff627aed826 (D:\LLVM\bin\clang++.exe+0x5bd826)
#22 0x00007ff627aea7e5 (D:\LLVM\bin\clang++.exe+0x5ba7e5)
#23 0x00007ff627ae917e (D:\LLVM\bin\clang++.exe+0x5b917e)
#24 0x00007ff62796c21a (D:\LLVM\bin\clang++.exe+0x43c21a)
#25 0x00007ff627968c73 (D:\LLVM\bin\clang++.exe+0x438c73)
#26 0x00007ff6291350b8 (D:\LLVM\bin\clang++.exe+0x1c050b8)
#27 0x00007ffaf1457374 (C:\WINDOWS\System32\KERNEL32.DLL+0x17374)
#28 0x00007ffaf25bcc91 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x4cc91)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 19.1.3
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: D:\LLVM\bin

source_and_run_script.zip
repro_files.zip

The issue only occurs when the classes are originally from different modules. If they are defined in the same module, the program builds fine.

[llvmbot]

@llvm/issue-subscribers-clang-modules

Author: Joni Helén (JoniHelen)

clang++ crashes while building CMake project with c++ modules using pointer-to-member pointers with the following stack trace:

Stack dump:
0.	Program arguments: D:\\LLVM\\bin\\clang++.exe -cc1 -triple x86_64-pc-windows-msvc19.41.34120 -emit-obj -mincremental-linker-compatible -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name bar.ixx -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -gno-column-info -gcodeview -debug-info-kind=constructor -fdebug-compilation-dir=D:\\Algotask3\\cmake-build-debug -object-file-name=D:\\Algotask3\\cmake-build-debug\\CMakeFiles\\ptr_bug.dir\\bar.ixx.obj -fcoverage-compilation-dir=D:\\Algotask3\\cmake-build-debug -resource-dir D:\\LLVM\\lib\\clang\\19 -O0 -std=gnu++23 -fdeprecated-macro -ferror-limit 19 -fno-use-cxa-atexit -fms-extensions -fms-compatibility -fms-compatibility-version=19.41.34120 -fno-implicit-modules -fmodule-file=foo=CMakeFiles/ptr_bug.dir/foo.pcm -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions --dependent-lib=msvcrtd -gcodeview -faddrsig -o CMakeFiles/ptr_bug.dir/bar.ixx.obj -x pcm CMakeFiles/ptr_bug.dir/bar.pcm
1.	<eof> parser at end of file
2.	D:\Algotask3\bar.ixx:5:14: LLVM IR generation of declaration 'Bar'
Exception Code: 0xC0000005
 #<!-- -->0 0x00007ff6275d6e30 (D:\LLVM\bin\clang++.exe+0xa6e30)
 #<!-- -->1 0x00007ff62920c356 (D:\LLVM\bin\clang++.exe+0x1cdc356)
 #<!-- -->2 0x00007ff628757dd0 (D:\LLVM\bin\clang++.exe+0x1227dd0)
 #<!-- -->3 0x00007ff628bb853a (D:\LLVM\bin\clang++.exe+0x168853a)
 #<!-- -->4 0x00007ff6283e03ec (D:\LLVM\bin\clang++.exe+0xeb03ec)
 #<!-- -->5 0x00007ff6283dc4ca (D:\LLVM\bin\clang++.exe+0xeac4ca)
 #<!-- -->6 0x00007ff628756d4f (D:\LLVM\bin\clang++.exe+0x1226d4f)
 #<!-- -->7 0x00007ff628755948 (D:\LLVM\bin\clang++.exe+0x1225948)
 #<!-- -->8 0x00007ff629736699 (D:\LLVM\bin\clang++.exe+0x2206699)
 #<!-- -->9 0x00007ff629732ce0 (D:\LLVM\bin\clang++.exe+0x2202ce0)
#<!-- -->10 0x00007ff6297326c2 (D:\LLVM\bin\clang++.exe+0x22026c2)
#<!-- -->11 0x00007ff629732651 (D:\LLVM\bin\clang++.exe+0x2202651)
#<!-- -->12 0x00007ff6297309e8 (D:\LLVM\bin\clang++.exe+0x22009e8)
#<!-- -->13 0x00007ff62877a752 (D:\LLVM\bin\clang++.exe+0x124a752)
#<!-- -->14 0x00007ff62910faec (D:\LLVM\bin\clang++.exe+0x1bdfaec)
#<!-- -->15 0x00007ff6290fe816 (D:\LLVM\bin\clang++.exe+0x1bce816)
#<!-- -->16 0x00007ff62a525af4 (D:\LLVM\bin\clang++.exe+0x2ff5af4)
#<!-- -->17 0x00007ff62992565e (D:\LLVM\bin\clang++.exe+0x23f565e)
#<!-- -->18 0x00007ff629094f2a (D:\LLVM\bin\clang++.exe+0x1b64f2a)
#<!-- -->19 0x00007ff627af0f21 (D:\LLVM\bin\clang++.exe+0x5c0f21)
#<!-- -->20 0x00007ff627af0ab2 (D:\LLVM\bin\clang++.exe+0x5c0ab2)
#<!-- -->21 0x00007ff627aed826 (D:\LLVM\bin\clang++.exe+0x5bd826)
#<!-- -->22 0x00007ff627aea7e5 (D:\LLVM\bin\clang++.exe+0x5ba7e5)
#<!-- -->23 0x00007ff627ae917e (D:\LLVM\bin\clang++.exe+0x5b917e)
#<!-- -->24 0x00007ff62796c21a (D:\LLVM\bin\clang++.exe+0x43c21a)
#<!-- -->25 0x00007ff627968c73 (D:\LLVM\bin\clang++.exe+0x438c73)
#<!-- -->26 0x00007ff6291350b8 (D:\LLVM\bin\clang++.exe+0x1c050b8)
#<!-- -->27 0x00007ffaf1457374 (C:\WINDOWS\System32\KERNEL32.DLL+0x17374)
#<!-- -->28 0x00007ffaf25bcc91 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x4cc91)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 19.1.3
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: D:\LLVM\bin

source_and_run_script.zip
repro_files.zip

The issue only occurs when the classes are originally from different modules. If they are defined in the same module, the program builds fine.