[krbdev.mit.edu #8261] configure should auto-detect OpenLDAP libs on Solaris 11 and higher

[Tomas Kuthan via RT]

Solaris 11 and higher delivers 2 implementations of LDAP libraries:
- Mozilla LDAP in /usr/lib/libldap.so.5
- OpenLDAP in /usr/lib/libldap-2.4.so (or re-entrant libldap_r-2.4.so)
     - (headers under /usr/include/openldap)

configure detects and uses the former.
Sadly, MIT krb5 no longer  builds with the old Mozilla LDAP lib:

gcc -fPIC -DSHARED -DHAVE_CONFIG_H 
-Dkrb5_dbe_lookup_last_pwd_change=kdb_ldap_dbe_lookup_last_pwd_change 
-Dkrb5_dbe_lookup_tl_data=kdb_ldap_dbe_lookup_tl_data 
-Dkrb5_dbe_update_last_pwd_change=kdb_ldap_dbe_update_last_pwd_change 
-Dkrb5_dbe_update_tl_data=kdb_ldap_dbe_update_tl_data 
-I../../../../include -I/builds/krb5/src/include 
-I/builds/krb5/src/lib/kdb -I/builds/krb5/src/lib/krb5/asn.1 
-DKRB5_DEPRECATED=1 -DKRB5_PRIVATE  -g -O2 -Wall -Wcast-align -Wshadow 
-Wmissing-prototypes -pedantic -Wno-format-zero-length -Woverflow 
-Wstrict-overflow -Wmissing-format-attribute -Wmissing-prototypes 
-Wreturn-type -Wmissing-braces -Wparentheses -Wswitch -Wunused-function 
-Wunused-label -Wunused-variable -Wunused-value -Wunknown-pragmas 
-Wsign-compare -Werror=uninitialized -Werror=pointer-arith 
-Werror=declaration-after-statement 
-Werror-implicit-function-declaration -D_REENTRANT -pthreads -c 
/builds/krb5/src/plugins/kdb/ldap/libkdb_ldap/kdb_ldap_conn.c -o 
kdb_ldap_conn.so.o && mv -f kdb_ldap_conn.so.o kdb_ldap_conn.so
In file included from /builds/krb5/src/include/k5-int.h:178:0,
                  from 
/builds/krb5/src/plugins/kdb/ldap/libkdb_ldap/kdb_ldap.h:35,
                  from 
/builds/krb5/src/plugins/kdb/ldap/libkdb_ldap/ldap_main.h:34,
                  from 
/builds/krb5/src/plugins/kdb/ldap/libkdb_ldap/kdb_ldap_conn.c:36:
/builds/krb5/src/include/k5-trace.h:93:20: warning: anonymous variadic 
macros were introduced in C99 [-Wvariadic-macros]
/builds/krb5/src/plugins/kdb/ldap/libkdb_ldap/kdb_ldap_conn.c: In 
function ‘authenticate’:
/builds/krb5/src/plugins/kdb/ldap/libkdb_ldap/kdb_ldap_conn.c:142:43: 
error: ‘LDAP_SASL_QUIET’ undeclared (first use in this function)
/builds/krb5/src/plugins/kdb/ldap/libkdb_ldap/kdb_ldap_conn.c:142:43: 
note: each undeclared identifier is reported only once for each function 
it appears in
gmake[2]: *** [kdb_ldap_conn.so] Error 1
gmake[2]: Leaving directory 
`/builds/krb5-build/plugins/kdb/ldap/libkdb_ldap'
gmake[1]: *** [all-recurse] Error 1
gmake[1]: Leaving directory `/builds/krb5-build/plugins/kdb/ldap'
gmake: *** [all-recurse] Error 1

Ideally configure would auto-detect and use OpenLDAP library at 
/usr/lib/libldap_r-2.4.so and headers from /usr/include/openldap.

Alternatively the --with-ldap option could accept path to the library as 
an argument:
./configure --with-ldap=/usr/lib/libldap_r-2.4.so ...