The ASM directive is used for defining all the hardware registers as 'variables'. Since teh header files are included into every compilation, all modules know of the variables' memory location and access it the same way. You should consider creating a global or project specific header file with the variable declarations and including it everywhere you use them, rather than using extern declarations.
Since variables declared with the asm directive cannot be initialized, none of the modules reading these declarations will generate an instance of this variable, so no global identifier is exported. But since the directive causes the variabel name replaced by the asm reference, the name is not referenced too, so thsi variable simply exists and is accessed, but never referenced by a symbol. (well, in theory, the ASM reference may be a global assembly symbol instead of a number, but that wouldn't be of any use) JMGross ----- Ursprüngliche Nachricht ----- Von: Mark J. Blair An: mspgcc-users Gesendet am: 21 Nov 2010 00:40:50 Betreff: Re: [Mspgcc-users] __no_init equivalent? On Nov 20, 2010, at 3:32 PM, Chris Liechti wrote: > http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Asm-Labels.html#Asm-Labels Aha! So, when the directive is used in this way, it's telling the compiler+assembler to simply cram the numeric constant in place of the symbol name? This would also explain why I'm getting undefined reference errors now from another module which references the USB-RAM-resident structures. I'm learning lots of stuff here, but I still have more experimentation ahead of me to find a nice, clean way to port this particular code. Maybe I'm better off just treating them as externs in the C code, and defining the symbols for linkage purposes in an assembler code file. ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Mspgcc-users mailing list Mspgcc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mspgcc-users
