Ah, good point. I learn something all the time on this list. Thanks Raphael.
On Sat, 21 Jun 2014, it would appear that Raphael Neider wrote: > Hi, > > while ok in this case (with variables being pinned to fixed locations), > please never put variable definitions into header files, even if guarded by > such defines. Sooner or later you will end up getting linker errors, which > someone could then try to resolve by making the variables static, which > leads to duplication of the variables and interesting errors at runtime. > > For variable declarations in header files, you need to use the extern > keyword! > > Best regards, > Raphael > On Jun 21, 2014 10:45 PM, "Joel Davidson" <j...@prismnet.com> wrote: > >> On Sat, 21 Jun 2014, it would appear that Kustaa Nyholm wrote: >> >>> On 18/06/2014 16:41, "Maarten Brock" <sourceforge.br...@dse.nl> wrote: >>>> >>>> I don't know. I don't work on the pic backend. But try it and you'll >> find >>>> out soon enough I guess by looking at the generated asm. >>> >>> Maybe I should have tried this first... >>> >>> >>> In the .h I put: >>> >>> extern volatile BDT ep0_o; >>> >>> >>> In the .c that includes above I put: >>> >>> volatile BDT __at (0x0400+0*8) ep0_o; >>> >>> and the compiler says: >>> >>> usb_pic_defs.c:9: error 91: extern definition for 'ep0_o' mismatches with >>> declaration. >>> usb_pic_defs.h:70: error 177: previously defined here >>> >>> >>> So...maybe I'm too tired but I can't figure out how I can put a >>> variable at a given address and declare it in the .h file >>> and define it in the .c file. If I define it at the .h file >>> then I get into trouble with linker if I include the .h file >>> in multiple .c files...not god. >>> >>> br Kusti >> >> Why not put: >> >> #ifndef __VARDEF >> volatile BDT __at (0x0400+0*8) ep0_o; >> #define __VARDEF >> #endif >> ...other defines >> >> in your .h? >> >> Joel >> -- >> Joel Davidson >> Austin, TX ------------------------------------------------------------------------------ HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing & Easy Data Exploration http://p.sf.net/sfu/hpccsystems _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
