[Confuse-devel] confuse 2.4 and static linking

[Eric Valette]

Hi,

I'm working as a subcontractor for a company currently switching its 
code from LynxOS 4.0 to Linux 2.6 + debian unstable. Currrently RT 
performances are not a problem, code size is mainly due to dynamic 
library bloat and required use of mlockall system call (to avoid page 
fault by loading the single big RT application in memory).

This application use libconfuse to parse configuration files and 
unfortunatelu the function "cfg_tilde_expand" is causing the import of 
dynamic library (lid_nss_compat and libnss_files) because of the use of 
getpwnam and getpwuid. These two functions end up doing dlopen from file 
nsswitch.c in the gnu c library adding several MB by side effect.

Attached file compilation shwos this problem :
gcc -static -o t2 t2.c
/tmp/ccmFcWgr.o(.text+0x18): In function `main':
: warning: Using 'getpwnam' in statically linked applications requires 
at runtime the shared libraries from the glibc version used for linking


Of course I have several option to fix this :
        1) Add and && defined(IMPORT_DYNAMIC_LIBRARY) at the _WIN32 #ifdef
	2) recode this functions that do real parsing of /etc/passwd file 
whatever nsswitch.conf tell them,

What do you think about this? Would you take a patch for solution 2)?

Have a nice day,
        

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#include <pwd.h>
#include <sys/types.h>
#include <unistd.h>


main()
{
  struct passwd *passEntry;

  passEntry = getpwnam ("root");
  if (passEntry != NULL)
    printf("shell for root = %s\n", passEntry->pw_shell);
  return 0;
  
}