[PATCH v4 1/1] Suppress "has no symbols" linker warnings on macOS.

After a recent macOS update, building Postgres produces warnings
that look like this:

    ranlib: warning: 'libpgport_shlib.a(pg_cpu_x86.c.o)' has no symbols
    ranlib: warning: 'libpgport_shlib.a(pg_popcount_x86.c.o)' has no symbols

To fix, add a dummy symbol to files that may otherwise have none.

Reported-by: Zhang Mingli <zmlpostgres@gmail.com>
Discussion: https://postgr.es/m/229aaaf3-f529-44ed-8e50-00cb6909af21%40Spark
Backpatch-through: 14
---
 src/common/protocol_openssl.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/common/protocol_openssl.c b/src/common/protocol_openssl.c
index ae378685e1f..4c039775a3f 100644
--- a/src/common/protocol_openssl.c
+++ b/src/common/protocol_openssl.c
@@ -114,4 +114,10 @@ SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version)
 	return 1;					/* success */
 }
 
-#endif							/* !SSL_CTX_set_min_proto_version */
+#else
+
+/* prevent linker complaints about empty module */
+extern int	protocol_openssl_dummy_variable;
+int			protocol_openssl_dummy_variable = 0;
+
+#endif
-- 
2.50.1 (Apple Git-155)


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