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Altera_Forum's avatar
Altera_Forum
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13 years ago

undefined reference to `fopen'

Hi Everyone,

I have a probelm with using Nios II Build for Eclipse... I wrote a small C program trying to read from a file, and I get an error

"C:\altera\mysopc_nios_sram\software\mySRAM_image/hello_world_small.c:117: undefined reference to `fopen'

my program is very simple, and I am including all the correct includes

# include "sys/alt_stdio.h"# include <stdio.h># include <string.h># include <stdlib.h># include "system.h"# include "altera_avalon_pio_regs.h"

...............

if( ( InputFile1 = fopen(name_in1, "r") ) == NULL)

printf("Input File 1 can not be opened \n");

please help,

Thank you :)

7 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    I don't believe you can use "fopen" if you have the "small C library" option selected in the properties for your project.

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    I'm not sure what version of Nios you are using but in the past I have opened the system library properties and unchecked "use small C library". This will probably increase your program size so you may need to increase the amount of memory allocated for your program code.

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    I am using Nios II 12.0 Software Build Tools for Eclipse, but I don't know where to uncheck "use small C library" ? I looked all over the place, but couldn't find it. Any ideas?

    Thanks
  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    I solved the problem... Here is what I did:

    1) I right clicked on my project and choose Nios II --> BSP Editor

    2) on the left hand side options where it says "settings"

    I chose Settings --> Common --> hal --> enable_small_c_library

    3) I unchecked "hal.enable_small_c_library"

    I rebuild the project and it compiled fine :)

    Thank you all for your help....
  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    Glad you figured it out.

    I guess BSP is the new "system library" then.