------- Comment #6 from xavier at tddft dot org  2008-04-22 22:51 -------
I have managed to create a test case:

Correct case:

xavier@corvo:~$ gcc-4.3 bravais.c mathfunc.c -O3 -fno-inline
bravais.c: In function ‘main’:
bravais.c:83: warning: incompatible implicit declaration of built-in function
‘printf’
xavier@corvo:~$ ./a.out 
0 

Wrong case:

xavier@corvo:~$ gcc-4.3 bravais.c mathfunc.c -O3
bravais.c: In function ‘main’:
bravais.c:83: warning: incompatible implicit declaration of built-in function
‘printf’
xavier@corvo:~$ ./a.out 
-1 

Sorry for using two files, but the problem disappears if all functions are in a
single file.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36008