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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Compiler crash on MSVC when building with JIT and PGO","articleBody":"# Bug report\n\n### Bug description:\n\nBuilding with the JIT and PGO simultaneously causes MSVC 1941 to crash:\n\n```\nMerging D:\\a\\cpython\\cpython\\PCbuild\\amd64\\python314!1.pgc\n  D:\\a\\cpython\\cpython\\PCbuild\\amd64\\python314!1.pgc: Used 31.3% (19698312 / 62844928) of total space reserved.  0.0% of the counts were dropped due to overflow.\n    Reading PGD file 1: D:\\a\\cpython\\cpython\\PCbuild\\amd64\\python314.pgd\n     Creating library D:\\a\\cpython\\cpython\\PCbuild\\amd64\\python314.lib and object D:\\a\\cpython\\cpython\\PCbuild\\amd64\\python314.exp\n  Generating code\n  \n  0 of 0 ( 0.0%) original invalid call sites were matched.\n  0 new call sites were added.\n  291 of 16259 (  1.79%) profiled functions will be compiled for speed, and the rest of the functions will be compiled for size\nD:\\a\\cpython\\cpython\\Python\\ceval.c(766): fatal error C1001: Internal compiler error. [D:\\a\\cpython\\cpython\\PCbuild\\pythoncore.vcxproj]\n  (compiler file 'D:\\a\\_work\\1\\s\\src\\vctools\\Compiler\\Utc\\src\\p2\\main.c', line 247)\n   To work around this problem, try simplifying or changing the program near the locations listed above.\n  If possible please provide a repro here: https://developercommunity.visualstudio.com/ \n  Please choose the Technical Support command on the Visual C++ \n   Help menu, or open the Technical Support help file for more information\n    link!InvokeCompilerPass()+0xd94ce\n    link!InvokeCompilerPass()+0xd94ce\n    link!InvokeCompilerPass()+0xd922d\n    link!InvokeCompilerPass()+0xd610c\n    link!InvokeCompilerPass()+0xd6011\n    link!CloseTypeServerPDB()+0x12904\n    link!InvokeCompilerPassW()+0x65cd9\n    link!InvokeCompilerPassW()+0x65c9c\n    link!time32()+0x83\n    link!BaseThreadInitThunk()+0x19\n    link!RtlGetFullPathName_UEx()+0xad\n    link!RtlGetFullPathName_UEx()+0x7b\n```\n\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nWindows\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-125218\n* gh-125477\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/mdboom","@type":"Person","name":"mdboom"},"datePublished":"2024-10-09T21:12:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/125217/cpython/issues/125217"}