i'm new to GCC/Gnude and have been through a lot of makefile trouble which is finally solved but it appears i still have one remaining problem. sprintf( ) doesn't work. strcpy & strcat work fine. i suspect there's a library initialization that isn't being called for some reason. the code worked fine when i used the keil compiler. sprintf(s, "Day %d", 1) i have looked for the source for sprintf but have never found it. truthfully, i'm also not sure i'm looking in the right place. I imagine i should be looking at http://www.gnu.org . i found some source but never managed to find what i'm looking for. thank you! mp
Mike P wrote: >sprintf( ) doesn't work. strcpy & strcat work fine. i suspect there's >a library initialization that isn't being called for some reason. Is there enough stack-space available? Is the heap initilalized? Does the linker set the "end"-symbol correctly? >the code worked fine when i used the keil compiler. >sprintf(s, "Day %d", 1) I expect you do not use the "Keil compiler" (very outdated) but the Realview toolchain which comes with MDK-ARM but this will not help anyway. The interfaces for stdio functions like sprintf are standardized but the implementions are different. > i have looked for the source for sprintf but have never found it. > truthfully, i'm also not sure i'm looking in the right place. stio-functions like sprintf are part of the libc. Most binary disitributions for the GNU ARM-cross-toolchain use the newlib as libc. If you are using such a package you will find the sources in the newlib CVS: http://sourceware.org/cgi-bin/cvsweb.cgi/src/newlib/libc/stdio/?cvsroot=src >I imagine i should be looking at http://www.gnu.org . i found some >source but never managed to find what i'm looking for. As far as I know the compiler can replace calls to sprintf which only use constant parameters which something like memcopy if optimization is enabled. Maybe you have found code for this in the gcc-sources but it will not help with non-constant parameters.
sorry for my slow reply--i've been taking what you've said & tried to learn some parts that could possibly help me. >Is there enough stack-space available? Is the heap initilalized? Does the linker set the "end"-symbol correctly? sorry, i don't know how. i'm just using an example. >I expect you do not use the "Keil compiler" (very outdated) yes; price thank you for the source link. sure is adorned with macros. didn't see how to init that library. in a way, that's probably not my biggest problem because i can't even make much in the way of calls. sounds like stack trouble but i don't know how to fix that. attached a file for that. i expect i need to make the linker command line agree with simple.cmd and makefile and startup.s. i tried by it was entirely unsuccessful. can you help me? i'm not accustomed to being so "stuck". i'm a programmer by trade but haven't done much embedded stuff. what i did do was arduino and some 8051 assembler. they were so easy. Arm is not. thank you for any help you can provide! mp
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