gcc -Wall -pedantic

Hi! I have to compile code for an assignment with the gcc options -Wall -pedantic.
there must not be warnings in order to submit it, so here there's the output

Code:

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[cls2@it151 DPLAN]$ gcc -Wall -pedantic lbase.c
lbase.c: In function ‘convertiEvento’:
lbase.c:66: warning: ISO C90 forbids mixed declarations and code
lbase.c:67: warning: implicit declaration of function ‘snprintf’
lbase.c:67: warning: incompatible implicit declaration of built-in function ‘snprintf’
/usr/lib/gcc/i386-redhat-linux/4.3.2/../../../crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

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The main is in another file so the problem is only with the snprintf().
I had a look to the man page of snprintf:

Code:

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  Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

      snprintf(), vsnprintf(): _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
      _ISOC99_SOURCE; or cc -std=c99

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I tried to define those variables but unfortunately the warning is still there!
Any idea?

Cheers

first warning means you have variable declarations like
int i;
after other code

C90 requires all declarations to be at the beginnign of the block

about snprintf - you do not need to declare it manually - rather include the correct header file

Yes you're right about the declarations... i remembered!... But which file should i include for the snprintf?

Quote:

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Originally Posted by flexo87

But which file should i include for the snprintf?

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The standard header <stdio.h>

That's it! Thanks

Quote:

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Originally Posted by flexo87

Yes you're right about the declarations... i remembered!... But which file should i include for the snprintf?

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doesn't your man page specified it?

or it took you less time to write a question on the board than type "man snprintf" on the console?