Link libpq with libdl if the platform needs that.

tglsfdc · tglsfdc · commit 4df477153a6b · 2025-07-09T14:21:06.000-04:00
Since b0635bf, libpq uses dlopen() and related functions. On some platforms these are not supplied by libc, but by a separate library libdl, in which case we need to make sure that that dependency is known to the linker. Meson seems to take care of that automatically, but the Makefile didn't cater for it. Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/1328170.1752082586@sss.pgh.pa.us Backpatch-through: 18
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
@@ -87,7 +87,7 @@ endif
 # that are built correctly for use in a shlib.
 SHLIB_LINK_INTERNAL = -lpgcommon_shlib -lpgport_shlib
 ifneq ($(PORTNAME), win32)
-SHLIB_LINK += $(filter -lcrypt -ldes -lcom_err -lcrypto -lk5crypto -lkrb5 -lgssapi_krb5 -lgss -lgssapi -lssl -lsocket -lnsl -lresolv -lintl -lm, $(LIBS)) $(LDAP_LIBS_FE) $(PTHREAD_LIBS)
+SHLIB_LINK += $(filter -lcrypt -ldes -lcom_err -lcrypto -lk5crypto -lkrb5 -lgssapi_krb5 -lgss -lgssapi -lssl -lsocket -lnsl -lresolv -lintl -ldl -lm, $(LIBS)) $(LDAP_LIBS_FE) $(PTHREAD_LIBS)
 else
 SHLIB_LINK += $(filter -lcrypt -ldes -lcom_err -lcrypto -lk5crypto -lkrb5 -lgssapi32 -lssl -lsocket -lnsl -lresolv -lintl -lm $(PTHREAD_LIBS), $(LIBS)) $(LDAP_LIBS_FE)
 endif
