I've run into a strange "undefined reference to" compile error that I cannot seem to find a resolution for. I'm trying to configure/compile PAM 1.1.6 for my Gumstix Overo using the Yocto Project generated ARM compiler (arm-poky-linux-gnueabi-gcc), but I keep getting the following error during compilation:
.libs/pam_rhosts.o: In function `pam_sm_authenticate':
modules/pam_rhosts/pam_rhosts.c:117: undefined reference to `ruserok'
collect2: error: ld returned 1 exit status
So, I did a some investigating and found out that during configure, the following test code is compiled and executed to determine the availability of ruserok, ruserok_af and iruserok.
/* end confdefs.h. */
/* Define $2 to an innocuous variant, in case <limits.h> declares $2.
For example, HP-UX 11i <limits.h> declares gettimeofday. */
#define $2 innocuous_$2
/* System header to define __stub macros and hopefully few prototypes,
which can conflict with char $2 (); below.
Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
<limits.h> exists even on freestanding compilers. */
#ifdef __STDC__
# include <limits.h>
#else
# include <assert.h>
#endif
#undef $2
/* Override any GCC internal prototype to avoid an error.
Use char because int might match the return type of a GCC
builtin and then its argument prototype would still apply. */
#ifdef __cplusplus
extern "C"
#endif
char $2 ();
/* The GNU C library defines this for functions which it implements
to always fail with ENOSYS. Some functions are actually named
something starting with __ and the normal name is an alias. */
#if defined __stub_$2 || defined __stub___$2
choke me
#endif
int
main ()
{
return $2 ();
;
return 0;
}
So, I copied, pasted (replacing all of the $2's with ruserok) and compiled this code using the generated GCC compiler
./arm-poky-linux-gnueabi-gcc -o test.o test.c
to see if the ruserok, ruserok_af and iuserok functions do/don't exist, and I received the following compilation error:
/tmp/ccU8YszI.o: In function `main':
test.c:(.text+0x8): undefined reference to `ruserok'
collect2: error: ld returned 1 exit status
which, is the same "undefined reference to `ruserok'" error as above. As a sanity check, since I had installed the Ubuntu/Linaro ARM GCC compiler through the Ubuntu Software center earlier, I compiled the same code with the arm-linux-gnueabi-gcc compiler, but the code compiled fine without any errors. Here the command I used for reference:
arm-linux-gnueabi-gcc -o test.o test.c