Detect presence of SSL_get_current_compression

Apparently we still build against OpenSSL so old that it doesn't
have this function, so add an autoconf check for it to make the
buildfarm happy. If the function doesn't exist, always return
that compression is disabled, since presumably the actual
compression functionality is always missing.

For now, hardcode the function as present on MSVC, since we should
hopefully be well beyond those old versions on that platform.

3 files changed, 10 insertions, 0 deletions

diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 4fb7288710d..d30a2a701b0 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -433,6 +433,9 @@
 /* Define to 1 if you have the `srandom' function. */
 #undef HAVE_SRANDOM
 
+/* Define to 1 if you have the `SSL_get_current_compression' function. */
+#undef HAVE_SSL_GET_CURRENT_COMPRESSION
+
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H
 
diff --git a/src/include/pg_config.h.win32 b/src/include/pg_config.h.win32
index 58777caa5f2..e9fa43e49b4 100644
--- a/src/include/pg_config.h.win32
+++ b/src/include/pg_config.h.win32
@@ -340,6 +340,9 @@
 /* Define to 1 if you have the `srandom' function. */
 /* #undef HAVE_SRANDOM */
 
+/* Define to 1 if you have the `SSL_get_current_compression' function. */
+#define HAVE_SSL_GET_CURRENT_COMPRESSION 1
+
 /* Define to 1 if you have the <stdint.h> header file. */
 /* #undef HAVE_STDINT_H */
 
diff --git a/src/include/port.h b/src/include/port.h
index 3d974818344..9f8465e78ad 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -420,6 +420,10 @@ extern void unsetenv(const char *name);
 extern void srandom(unsigned int seed);
 #endif
 
+#ifndef HAVE_SSL_GET_CURRENT_COMPRESSION
+#define SSL_get_current_compression(x) 0
+#endif
+
 /* thread.h */
 extern char *pqStrerror(int errnum, char *strerrbuf, size_t buflen);