undefined reference to 'fopen' when build the count-binary template

You've got some code reduction options turned on. Only those examples which are tailored specifically for small code size will function with these options enabled. As you've discovered, count_binary is not one of these applications.

Cheers,

- slacker

Thanks for your quick response.

Can you elaborate it a little more? How do you know I turned on "code reduction option" by looking at my errors? Where can I turn off this option?

--- Quote Start ---

You've got some code reduction options turned on. Only those examples which are tailored specifically for small code size will function with these options enabled. As you've discovered, count_binary is not one of these applications.

Cheers,

- slacker

--- Quote End ---

Hi

I have the same problems the guy above is having. My C code is quite small:

#include <stdio.h>

#include "system.h"

#include <string.h>

#include "altera_avalon_jtag_uart.h"

#include "altera_avalon_jtag_uart_fd.h"

#include "altera_avalon_jtag_uart_regs.h"

int main()

{

char* msg = "Detected the character 't'.\n";

FILE* fp;

char prompt = 0;

fp = fopen ("/mnt/host/test.txt", "r+"); //Open file for reading and writing

if (fp)

{

while (prompt != 'v')

{ // Loop until we receive a 'v'.

prompt = getc(fp); // Get a character from the JTAG UART.

if (prompt == 't')

{ // Print a message if character is 't'.

fwrite (msg, strlen (msg), 1, fp);

}

if (ferror(fp))// Check if an error occurred with the file pointer

clearerr(fp);// If so, clear it.

}

fprintf(fp, "Closing the JTAG UART file handle.\n");

fclose (fp);

}

return 0;

}

When I have "small_c_library" disabled I get these build error messages:

nios2-elf-g++ -T'../epuisant_bsp/linker.x' -msys-crt0='../epuisant_bsp/obj/HAL/src/crt0.o' -msys-lib=hal_bsp -L../epuisant_bsp -Wl,-Map=epuisant.map -O0 -g -Wall -mno-hw-div -mhw-mul -mno-hw-mulx -o epuisant.elf obj/jtag.o -lm

/cygdrive/c/altera/91/nios2eds/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.6/../../../../nios2-elf/bin/ld: region onchip_memory is full (epuisant.elf section .text). Region needs to be 1696 bytes larger.

/cygdrive/c/altera/91/nios2eds/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.6/../../../../nios2-elf/bin/ld: section .rodata [02210020 -> 0221054b] overlaps section .exceptions [02210020 -> 022101c3]

/cygdrive/c/altera/91/nios2eds/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.6/../../../../nios2-elf/bin/ld: section .rwdata [0221054c -> 02211fe7] overlaps section .text [022101c4 -> 0221c29f]

/cygdrive/c/altera/91/nios2eds/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.6/../../../../nios2-elf/bin/ld: section .bss [02211fe8 -> 022120ef] overlaps section .text [022101c4 -> 0221c29f]

collect2: ld returned 1 exit status

make: *** [epuisant.elf] Error 1

But when I enable the "small_c_library" option I get these ones:

obj/HAL/src/alt_uncached_free.o obj/HAL/src/alt_uncached_malloc.o obj/HAL/src/alt_unlink.o obj/HAL/src/alt_usleep.o obj/HAL/src/alt_wait.o obj/HAL/src/alt_write.o obj/HAL/src/altera_nios2_irq.o obj/HAL/src/crt0.o obj/alt_sys_init.o obj/drivers/src/altera_avalon_jtag_uart_fd.o obj/drivers/src/altera_avalon_jtag_uart_init.o obj/drivers/src/altera_avalon_jtag_uart_ioctl.o obj/drivers/src/altera_avalon_jtag_uart_read.o obj/drivers/src/altera_avalon_jtag_uart_write.o obj/drivers/src/altera_avalon_sysid.o obj/drivers/src/altera_hostfs.o

[BSP build complete]

Info: Compiling jtag.c to obj/jtag.o

nios2-elf-gcc -xc -MP -MMD -c -I../epuisant_bsp -I../epuisant_bsp/drivers/inc -I../epuisant_bsp/HAL/inc -DSYSTEM_BUS_WIDTH=32 -D__hal__ -pipe -DALT_NO_C_PLUS_PLUS -DALT_NO_INSTRUCTION_EMULATION -DALT_SINGLE_THREADED -O0 -g -Wall -mno-hw-div -mhw-mul -mno-hw-mulx -o obj/jtag.o jtag.c

Info: Linking epuisant.elf

nios2-elf-g++ -T'../epuisant_bsp/linker.x' -msys-crt0='../epuisant_bsp/obj/HAL/src/crt0.o' -msys-lib=hal_bsp -L../epuisant_bsp -msmallc -Wl,-Map=epuisant.map -O0 -g -Wall -mno-hw-div -mhw-mul -mno-hw-mulx -o epuisant.elf obj/jtag.o -lm

obj/jtag.o(.text+0x30): In function `main':

/cygdrive/e/epuisant/software/epuisant/jtag.c:20: undefined reference to `fopen'

obj/jtag.o(.text+0x54):/cygdrive/e/epuisant/software/epuisant/jtag.c:25: undefined reference to `getc'

obj/jtag.o(.text+0x80):/cygdrive/e/epuisant/software/epuisant/jtag.c:28: undefined reference to `fwrite'

obj/jtag.o(.text+0xc8):/cygdrive/e/epuisant/software/epuisant/jtag.c:34: undefined reference to `fclose'

collect2: ld returned 1 exit status

Could it be because of a small RAM memory? Should I just use a larger memory? I've followed all the instructions to create a file based system but nothing works....

Please help

--- Quote Start ---

Region needs to be 1696 bytes larger.

--- Quote End ---

Yes, making the memory larger is one option.

The other is to use alternate (smaller) stdio routines. There are examples (at least one) that show you how to do this.

Cheers,

slacker

--- Quote Start ---

Yes, making the memory larger is one option.

The other is to use alternate (smaller) stdio routines. There are examples (at least one) that show you how to do this.

Cheers,

slacker

--- Quote End ---

Thanks for the quich reply, I'm grateful.

--- Quote Start ---

Although your code is small, it uses a lot of the C runtime library ...

--- Quote End ---

Thanks for the quick reply. I'm grateful.

--- Quote Start ---

Hi

I have the same problems the guy above is having. My C code is quite small:

#include

<stdio.h>

#include

"system.h"

#include

<string.h>

#include

"altera_avalon_jtag_uart.h"

#include

"altera_avalon_jtag_uart_fd.h"

#include

"altera_avalon_jtag_uart_regs.h"

int

main()

{

char

* msg = "Detected the character 't'.\n";

FILE

* fp;

char

prompt = 0;

fp = fopen ("/mnt/host/test.txt", "r+"); //Open file for reading and writing

--- Quote End ---

Hi,

I wanted to ask you? where is the test.txt file in reference to your Nios II EDS build for Eclipse software?

I am tryuing to read from a textfile, but I don't know where to put my text file? In the Project worskspace? or where?

could someone help me please?

Thank you