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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unreachable code warnings while building latest main  at 48c70b8","articleBody":"# Bug report\r\n\r\n### Bug description:\r\n\r\nI ran the `./configure` and `make`, here are the warnings shown.\r\n\r\n```\r\ngcc -c -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include    -DPy_BUILD_CORE -o Python/ast.o Python/ast.c\r\ngcc -c -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include    -DPy_BUILD_CORE -o Python/ast_opt.o Python/ast_opt.c\r\ngcc -c -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include    -DPy_BUILD_CORE -o Python/ast_unparse.o Python/ast_unparse.c\r\ngcc -c -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include    -DPy_BUILD_CORE -o Python/bltinmodule.o Python/bltinmodule.c\r\ngcc -c -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include    -DPy_BUILD_CORE -o Python/brc.o Python/brc.c\r\ngcc -c -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include    -DPy_BUILD_CORE -o Python/ceval.o Python/ceval.c\r\nIn file included from Python/ceval.c:904:\r\nPython/generated_cases.c.h:808:31: warning: code will never be executed [-Wunreachable-code]\r\n  808 |                 for (int _i = oparg; --_i \u003e= 0;) {\r\n      |                               ^~~~~\r\nPython/generated_cases.c.h:694:31: warning: code will never be executed [-Wunreachable-code]\r\n  694 |                 for (int _i = oparg*2; --_i \u003e= 0;) {\r\n      |                               ^~~~~\r\n2 warnings generated.\r\n```\r\n\r\nOperating System:\r\n```\r\n➜  cpython git:(main) uname -a\r\nDarwin SREDDY- 24.1.0 Darwin Kernel Version 24.1.0: Thu Oct 10 21:02:27 PDT 2024; root:xnu-11215.41.3~2/RELEASE_X86_64 x86_64\r\n```\r\n\r\nMain branch commit : 48c70b8f7dfd00a018abbac50ea987f54fa4db51\r\n\r\n### CPython versions tested on:\r\n\r\nCPython main branch\r\n\r\n### Operating systems tested on:\r\n\r\nmacOS","author":{"url":"https://github.com/srinivasreddy","@type":"Person","name":"srinivasreddy"},"datePublished":"2024-12-19T05:32:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":18},"url":"https://github.com/128086/cpython/issues/128086"}