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pal.h will not build with clang 18 for x86 #101639

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richlander opened this issue Apr 27, 2024 · 2 comments · Fixed by #101650
Closed

pal.h will not build with clang 18 for x86 #101639

richlander opened this issue Apr 27, 2024 · 2 comments · Fixed by #101650
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arch-x86 area-PAL-coreclr

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@richlander
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Builds with clang 16 but not clang 18. This is specific to 32-bit Linux.

  /__w/1/s/src/coreclr/pal/inc/pal.h:3605:5: error: __sync builtin operation MUST have natural alignment (consider using __atomic). [-Werror,-Wsync-alignment]
   3605 |     __sync_val_compare_and_swap(
        |     ^
  /__w/1/s/src/coreclr/pal/inc/pal.h:3471:5: error: __sync builtin operation MUST have natural alignment (consider using __atomic). [-Werror,-Wsync-alignment]
   3471 |     __sync_add_and_fetch(lpAddend, (LONGLONG)1)
        |     ^
  /__w/1/s/src/coreclr/pal/inc/pal.h:3506:5: error: __sync builtin operation MUST have natural alignment (consider using __atomic). [-Werror,-Wsync-alignment]
   3506 |     __sync_sub_and_fetch(lpAddend, (LONGLONG)1)
        |     ^
  3 errors generated.

#101630 (comment)
@dotnet-issue-labeler dotnet-issue-labeler bot added the needs-area-label An area label is needed to ensure this gets routed to the appropriate area owners label Apr 27, 2024
@dotnet-policy-service dotnet-policy-service bot added the untriaged New issue has not been triaged by the area owner label Apr 27, 2024
@am11 am11 added area-PAL-coreclr arch-x86 and removed needs-area-label An area label is needed to ensure this gets routed to the appropriate area owners labels Apr 27, 2024
@am11
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am11 commented Apr 27, 2024

This diagnostic was added in https://reviews.llvm.org/D143813, it is looking for something like

-    InterlockedIncrement64(IN OUT LONGLONG volatile *lpAddend),
+    InterlockedIncrement64(IN OUT LONGLONG volatile *lpAddend DECLSPEC_ALIGN(8)),

@richlander
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Looks like that change is in LLVM 17+. Thanks for the extra info.

@am11 am11 mentioned this issue Apr 27, 2024
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@dotnet-policy-service dotnet-policy-service bot removed the untriaged New issue has not been triaged by the area owner label Apr 28, 2024
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Fix x86 build with clang-18 am11/runtime
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@richlander @am11