Re: Probable memory leak with ECPG and AIX

On Sat, Jul 02, 2022 at 02:53:34PM -0400, Tom Lane wrote:
> This looks solid to me.  The only nit I can find to pick is that I'd
> have added one more comment, along the lines of
> 
> diff --git a/src/interfaces/ecpg/ecpglib/connect.c b/src/interfaces/ecpg/ecpglib/connect.c
> index 9f958b822c..96f99ae072 100644
> --- a/src/interfaces/ecpg/ecpglib/connect.c
> +++ b/src/interfaces/ecpg/ecpglib/connect.c
> @@ -508,6 +508,11 @@ ECPGconnect(int lineno, int c, const char *name, const char *user, const char *p
>  #ifdef ENABLE_THREAD_SAFETY
>      pthread_mutex_lock(&connections_mutex);
>  #endif
> +
> +    /*
> +     * ... but first, make certain we have created ecpg_clocale.  Rely on
> +     * holding connections_mutex to ensure this is done by only one thread.
> +     */
>  #ifdef HAVE_USELOCALE
>      if (!ecpg_clocale)
>      {
> 
> I've marked it RFC.

Thanks for reviewing.  Pushed with that comment.  prairiedog complains[1]:

  ld: common symbols not allowed with MH_DYLIB output format with the -multi_module option
  connect.o definition of common _ecpg_clocale (size 4)

I bet this would fix it:

--- a/src/interfaces/ecpg/ecpglib/connect.c
+++ b/src/interfaces/ecpg/ecpglib/connect.c
@@ -11,7 +11,7 @@
 #include "sqlca.h"
 
 #ifdef HAVE_USELOCALE
-locale_t    ecpg_clocale;
+locale_t    ecpg_clocale = (locale_t) 0;
 #endif
 
 #ifdef ENABLE_THREAD_SAFETY

I hear[1] adding -fno-common to compiler options would also fix that.  Still,
in the absence of other opinions, I'll just add the no-op initialization.

[1] https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=prairiedog&dt=2022-07-03%2001%3A14%3A19
[2] https://gcc.gnu.org/legacy-ml/gcc/2005-06/msg00378.html