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I have writed a simple program like this:
/* ******************************* */
#include <stdlib.h>
void main(void) { unsigned char *ptr; ptr = (unsigned char *) malloc(sizeof(unsigned char)); free(ptr); } /* ***************************** */
This just used to test how to use malloc() and free() in PICC.But
after compiled,some error message appear:
Error[000] : undefined symbols:
Error[000] : _free (D:\MPLAB IDE\PICproject\Test\test.obj) Error[000] : _malloc (D:\MPLAB IDE\PICproject\Test\test.obj) I have doubt in why these error message appear.How
to do dynamic memory's program such use malloc() and free() in
PICC?
Best regards,
Bruce .J Sam |
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How to use malloc() and free() in PICC?
Started by ●August 24, 2004
Reply by ●August 24, 20042004-08-24
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You need to include "STDLIBM.H" to use those functions. The
compiler is giving those errors because it doesn't know what those two functions are without STDLIBM.H included. --- In , "Bruce.J Sam" <persevreman@y...> wrote: > I have writed a simple program like this: > /* ******************************* */ > #include <stdlib.h> > > void main(void) > { > unsigned char *ptr; > > ptr = (unsigned char *) malloc(sizeof(unsigned char)); > free(ptr); > } > /* ***************************** */ > This just used to test how to use malloc() and free() in PICC.But after compiled,some error message appear: > Error[000] : undefined symbols: > Error[000] : _free (D:\MPLAB IDE\PICproject\Test\test.obj) > Error[000] : _malloc (D:\MPLAB IDE\PICproject\Test\test.obj) > I have doubt in why these error message appear.How to do dynamic memory's program such use malloc() and free() in PICC? > Best regards, > Bruce .J Sam > > --------------------------------- > |
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Reply by ●August 25, 20042004-08-25
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Thanks john,
But I
couldn't found STDLIBM.H in the installation directory of the picc.Are
there other method to solve?
Thanks again,
Bruce .J Sam.
john <j...@yahoo.com> wrote: You need to include "STDLIBM.H" to use those functions. The compiler |
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Reply by ●August 25, 20042004-08-25
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Never mind about the STDLIBM.H that's for CCS's compiler, Hi-tech
PICC has a malloc.c in its sources directory you would need to add. The malloc.c file has the free() and malloc() functions in it. -John --- In , "Bruce.J Sam" <persevreman@y...> wrote: > Thanks john, > But I couldn't found STDLIBM.H in the installation directory of the picc.Are there other method to solve? > Thanks again, > Bruce .J Sam. > john <j_funk1425@y...> wrote: > You need to include "STDLIBM.H" to use those functions. The compiler > is giving those errors because it doesn't know what those two > functions are without STDLIBM.H included. > > --- In , "Bruce.J Sam" <persevreman@y...> > wrote: > > I have writed a simple program like this: > > /* ******************************* */ > > #include <stdlib.h> > > > > void main(void) > > { > > unsigned char *ptr; > > > > ptr = (unsigned char *) malloc(sizeof(unsigned char)); > > free(ptr); > > } > > /* ***************************** */ > > This just used to test how to use malloc() and free() in PICC.But > after compiled,some error message appear: > > Error[000] : undefined symbols: > > Error[000] : _free (D:\MPLAB IDE\PICproject\Test\test.obj) > > Error[000] : _malloc (D:\MPLAB IDE\PICproject\Test\test.obj) > > I have doubt in why these error message appear.How to do > dynamic memory's program such use malloc() and free() in PICC? > > Best regards, > > Bruce .J Sam > --------------------------------- > |
