diff options
Diffstat (limited to 'generic/tclInt.h')
| -rw-r--r-- | generic/tclInt.h | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/generic/tclInt.h b/generic/tclInt.h index 1d192ff..4c3977a 100644 --- a/generic/tclInt.h +++ b/generic/tclInt.h @@ -5145,11 +5145,33 @@ typedef struct NRE_callback { #endif /* + * Special hack for macOS, where the static linker (technically the 'ar' + * command) hates empty object files, and accepts no flags to make it shut up. + * + * These symbols are otherwise completely useless. + * + * They can't be written to or written through. They can't be seen by any + * other code. They use a separate attribute (supported by all macOS + * compilers, which are derivatives of clang or gcc) to stop the compilation + * from moaning. They will be excluded during the final linking stage. + * + * Other platforms get nothing at all. That's good. + */ + +#ifdef MAC_OSX_TCL +#define TCL_MAC_EMPTY_FILE(name) \ + static __attribute__((used)) const void *const TclUnusedFile_ ## name; \ + static const void *const TclUnusedFile_ ## name = NULL; +#else +#define TCL_MAC_EMPTY_FILE(name) +#endif /* MAC_OSX_TCL */ + +/* * Other externals. */ -MODULE_SCOPE size_t TclEnvEpoch; /* Epoch of the tcl environment - * (if changed with tcl-env). */ +MODULE_SCOPE size_t TclEnvEpoch; /* Epoch of the tcl environment + * (if changed with tcl-env). */ #endif /* _TCLINT */ |