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Title: defined() not recognizing ## token paste in its operand (GNU extension) · Issue #653 · cppcheck-opensource/simplecpp · GitHub

Open Graph Title: defined() not recognizing ## token paste in its operand (GNU extension) · Issue #653 · cppcheck-opensource/simplecpp

X Title: defined() not recognizing ## token paste in its operand (GNU extension) · Issue #653 · cppcheck-opensource/simplecpp

Description: When defined() appears inside a macro with ## op, syntaxError gets emitted. error: failed to evaluate #if condition, undefined function-like macro invocation: defined( ... ) [syntaxError] #if NRF_MODULE_ENABLED(FOO) Reproducer: main.c #d...

Open Graph Description: When defined() appears inside a macro with ## op, syntaxError gets emitted. error: failed to evaluate #if condition, undefined function-like macro invocation: defined( ... ) [syntaxError] #if NRF_M...

X Description: When defined() appears inside a macro with ## op, syntaxError gets emitted. error: failed to evaluate #if condition, undefined function-like macro invocation: defined( ... ) [syntaxError] #if NRF_M...

Opengraph URL: https://github.com/cppcheck-opensource/simplecpp/issues/653

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Domain: github.com

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"defined() not recognizing ## token paste in its operand (GNU extension)","articleBody":"\nWhen defined() appears inside a macro with ## op, syntaxError gets emitted.\n\u003e error: failed to evaluate #if condition, undefined function-like macro invocation: defined( ... ) [syntaxError]\n\u003e #if NRF_MODULE_ENABLED(FOO)\n\nReproducer: main.c\n```c\n#define NRF_MODULE_ENABLED(module) \\\n    (defined(module ## _ENABLED) \u0026\u0026 (module ## _ENABLED))\n\n#define FOO_ENABLED 1\n\n#if NRF_MODULE_ENABLED(FOO)\nint foo(void) { return 1; }\n#endif\n```\nThis is caused by the DEFINED branch in expandToken, which doesn't match defined(A ## B), and makes the token 'defined(...)' fall through.","author":{"url":"https://github.com/wjakobsson","@type":"Person","name":"wjakobsson"},"datePublished":"2026-05-21T09:03:45.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/653/simplecpp/issues/653"}

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