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| 4.1 - Checking C Code With more complicated extensions - especially Tk extensions - it is often necessary to check for platform specific features. For example, the busy widget has been extracted from George Howlett's BLT library [10] and built as a separate stubs-enabled package using CriTcl. Here is a code fragment from busy.tcl: if {[critcl::check "#include <limits.h>"]}{ The critcl::check procedure invokes the C compiler on the supplied C code, and returns true if the code compiles without errors. In this case, we are just testing for the existence of the limits.h header file. Using the C compiler in this way is perhaps less efficient that the more traditional approaches (such as autoconf). But it does have some key advantages - primarily simplicity and familiarity. Knowing C does not imply a knowledge of any particular compiler tool chain, especially as more people come to Tcl from the Windows and Mac worlds. | see also | ||||
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