Guard config.w32.h from multiple inclusion #17021
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Besides that is generally good practice to avoid macro redefinitions (and symbol redeclarations), and we're doing this on POSIX platforms anyway, there is a particular issue regarding phpize builds, where config.w32.h actually includes config.pickle.h. The latter overrides some macro definitions (e.g. `PHP_BUILD_SYSTEM`) to define the proper values, but if config.w32.h is included multiple times, different macro definitions eventually raise C4005 compiler warnings[1], which break builds with `/WX /W1` enabled. [1] <https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4005>
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Besides that is generally good practice to avoid macro redefinitions (and symbol redeclarations), and we're doing this on POSIX platforms anyway, there is a particular issue regarding phpize builds, where config.w32.h actually includes config.pickle.h. The latter overrides some macro definitions (e.g.
PHP_BUILD_SYSTEM) to define the proper values, but if config.w32.h is included multiple times, different macro definitions eventually raise C4005 compiler warnings[1], which break builds with/WX /W1enabled.[1] https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4005