Move PGAC_LDAP_SAFE to config/programs.m4.

This restores the style of keeping configure.in free of AC_DEFUN.  Per
gripe from Tom Lane.

1 files changed, 28 insertions, 0 deletions

diff --git a/config/programs.m4 b/config/programs.m4
index 76c0158973a..ed6711df167 100644
--- a/config/programs.m4
+++ b/config/programs.m4
@@ -116,6 +116,34 @@ AC_SUBST(FLEXFLAGS)
 
 
 
+# PGAC_LDAP_SAFE
+# --------------
+# PostgreSQL sometimes loads libldap_r and plain libldap into the same
+# process.  Check for OpenLDAP versions known not to tolerate doing so; assume
+# non-OpenLDAP implementations are safe.  The dblink test suite exercises the
+# hazardous interaction directly.
+
+AC_DEFUN([PGAC_LDAP_SAFE],
+[AC_CACHE_CHECK([for compatible LDAP implementation], [pgac_cv_ldap_safe],
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[#include <ldap.h>
+#if !defined(LDAP_VENDOR_VERSION) || \
+     (defined(LDAP_API_FEATURE_X_OPENLDAP) && \
+      LDAP_VENDOR_VERSION >= 20424 && LDAP_VENDOR_VERSION <= 20431)
+choke me
+#endif], [])],
+[pgac_cv_ldap_safe=yes],
+[pgac_cv_ldap_safe=no])])
+
+if test "$pgac_cv_ldap_safe" != yes; then
+  AC_MSG_WARN([
+*** With OpenLDAP versions 2.4.24 through 2.4.31, inclusive, each backend
+*** process that loads libpq (via WAL receiver, dblink, or postgres_fdw) and
+*** also uses LDAP will crash on exit.])
+fi])
+
+
+
 # PGAC_CHECK_READLINE
 # -------------------
 # Check for the readline library and dependent libraries, either