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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Couldn't build matplotlib 3.6.0 with both Clang-15 and GCC-12","articleBody":"### Bug summary\n\nIt fails to build with Clang-15 and GCC-12\r\nClang:\r\n```\r\n  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -march=x86-64 -mtune=generic -O2 -pipe -O3 -march=x86-64 -mtune=generic -O2 -pipe -O3 -march=x86-64 -mtune=generic -O2 -pipe -D__USE_MINGW_ANSI_STDIO=1 -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_backends__tkagg_ARRAY_API -DNPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION -D__STDC_FORMAT_MACROS=1 -Iextern/agg24-svn/include -Isrc -ID:/M/msys64/clang64/lib/python3.10/site-packages/numpy/core/include -ID:/M/msys64/clang64/include/python3.10 -c src/_tkagg.cpp -o build/temp.mingw_x86_64_clang-3.10/matplotlib.backends._tkagg/src/_tkagg.o\r\n  src/_tkagg.cpp:234:15: error: cannot initialize a variable of type 'void *' with an rvalue of type 'FARPROC' (aka 'long long (*)()')\r\n      if (void* ptr = dlsym(lib, \"Tcl_SetVar\")) {\r\n                ^     ~~~~~~~~~~~~~~~~~~~~~~~~\r\n  src/_tkagg.cpp:273:13: note: in instantiation of function template specialization 'load_tcl_tk\u003cHINSTANCE__ *\u003e' requested here\r\n          if (load_tcl_tk(modules[i])) {\r\n              ^\r\n  src/_tkagg.cpp:237:15: error: cannot initialize a variable of type 'void *' with an rvalue of type 'FARPROC' (aka 'long long (*)()')\r\n      if (void* ptr = dlsym(lib, \"Tk_FindPhoto\")) {\r\n                ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n  src/_tkagg.cpp:240:15: error: cannot initialize a variable of type 'void *' with an rvalue of type 'FARPROC' (aka 'long long (*)()')\r\n      if (void* ptr = dlsym(lib, \"Tk_PhotoPutBlock\")) {\r\n                ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n  3 errors generated.\r\n```\r\nGCC:\r\n```\r\n  gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -march=x86-64 -mtune=generic -O2 -pipe -O3 -march=x86-64 -mtune=generic -O2 -pipe -O3 -march=x86-64 -mtune=generic -O2 -pipe -D__USE_MINGW_ANSI_STDIO=1 -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_backends__tkagg_ARRAY_API -DNPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION -D__STDC_FORMAT_MACROS=1 -Iextern/agg24-svn/include -Isrc -ID:/M/msys64/ucrt64/lib/python3.10/site-packages/numpy/core/include -ID:/M/msys64/ucrt64/include/python3.10 -c src/_tkagg.cpp -o build/temp.mingw_x86_64_ucrt-3.10/matplotlib.backends._tkagg/src/_tkagg.o\r\n  src/_tkagg.cpp: In instantiation of 'bool load_tcl_tk(T) [with T = HINSTANCE__*]':\r\n  src/_tkagg.cpp:273:24:   required from here\r\n  src/_tkagg.cpp:234:26: error: invalid conversion from 'FARPROC' {aka 'long long int (*)()'} to 'void*' [-fpermissive]\r\n    234 |     if (void* ptr = dlsym(lib, \"Tcl_SetVar\")) {\r\n        |                          ^\r\n        |                          |\r\n        |                          FARPROC {aka long long int (*)()}\r\n  src/_tkagg.cpp:237:26: error: invalid conversion from 'FARPROC' {aka 'long long int (*)()'} to 'void*' [-fpermissive]\r\n    237 |     if (void* ptr = dlsym(lib, \"Tk_FindPhoto\")) {\r\n        |                          ^\r\n        |                          |\r\n        |                          FARPROC {aka long long int (*)()}\r\n  src/_tkagg.cpp:240:26: error: invalid conversion from 'FARPROC' {aka 'long long int (*)()'} to 'void*' [-fpermissive]\r\n    240 |     if (void* ptr = dlsym(lib, \"Tk_PhotoPutBlock\")) {\r\n        |                          ^\r\n        |                          |\r\n        |                          FARPROC {aka long long int (*)()}\r\n```\n\n### Code for reproduction\n\n```python\nNo code required\n```\n\n\n### Actual outcome\n\nBuilding succeeds\n\n### Expected outcome\n\nBuilding fails\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n3.6.0\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n3.10.7\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\n_No response_","author":{"url":"https://github.com/MehdiChinoune","@type":"Person","name":"MehdiChinoune"},"datePublished":"2022-09-19T04:50:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/23943/matplotlib/issues/23943"}