Define OPENSSL_API_COMPAT

This avoids deprecation warnings from newer OpenSSL versions (3.0.0 in
particular).

This has been originally applied as 4d3db13 for v14 and newer versions,
but not on the older branches out of caution, and this commit closes the
gap to remove all these deprecation warnings in all the branches still
supported.

OPENSSL_API_COMPAT's value is set based on the oldest version of OpenSSL
supported on a branch: 1.0.1 for Postgres 13 and 0.9.8 for Postgres 11
and 12.

Reviewed-by: Daniel Gustafsson
Discussion: https://postgr.es/m/[email protected]
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 11

5 files changed, 25 insertions, 2 deletions

diff --git a/configure b/configure
index 1577cf7ad37..dae02c86874 100755
--- a/configure
+++ b/configure
@@ -12063,7 +12063,11 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
-    if test "$PORTNAME" != "win32"; then
+    # Minimum required OpenSSL version is 0.9.8
+
+$as_echo "#define OPENSSL_API_COMPAT 0x00908000L" >>confdefs.h
+
+  if test "$PORTNAME" != "win32"; then
      { $as_echo "$as_me:${as_lineno-$LINENO}: checking for CRYPTO_new_ex_data in -lcrypto" >&5
 $as_echo_n "checking for CRYPTO_new_ex_data in -lcrypto... " >&6; }
 if ${ac_cv_lib_crypto_CRYPTO_new_ex_data+:} false; then :
diff --git a/configure.in b/configure.in
index 0b44e2119f0..29de083fe88 100644
--- a/configure.in
+++ b/configure.in
@@ -1269,6 +1269,9 @@ fi
 
 if test "$with_openssl" = yes ; then
   dnl Order matters!
+  # Minimum required OpenSSL version is 0.9.8
+  AC_DEFINE(OPENSSL_API_COMPAT, [0x00908000L],
+            [Define to the OpenSSL API version in use. This avoids deprecation warnings from newer OpenSSL versions.])
   if test "$PORTNAME" != "win32"; then
      AC_CHECK_LIB(crypto, CRYPTO_new_ex_data, [], [AC_MSG_ERROR([library 'crypto' is required for OpenSSL])])
      AC_CHECK_LIB(ssl,    SSL_new, [], [AC_MSG_ERROR([library 'ssl' is required for OpenSSL])])
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 912132dbc5b..157b504ea6a 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -778,6 +778,10 @@
 /* Define bytes to use libc memset(). */
 #undef MEMSET_LOOP_LIMIT
 
+/* Define to the OpenSSL API version in use. This avoids deprecation warnings
+   from newer OpenSSL versions. */
+#undef OPENSSL_API_COMPAT
+
 /* Define to the address where bug reports for this package should be sent. */
 #undef PACKAGE_BUGREPORT
 
diff --git a/src/include/pg_config.h.win32 b/src/include/pg_config.h.win32
index 9510b982160..7fa151f41b4 100644
--- a/src/include/pg_config.h.win32
+++ b/src/include/pg_config.h.win32
@@ -628,6 +628,10 @@
 /* Define bytes to use libc memset(). */
 #define MEMSET_LOOP_LIMIT 1024
 
+/* Define to the OpenSSL API version in use. This avoids deprecation warnings
+   from newer OpenSSL versions. */
+#define OPENSSL_API_COMPAT 0x00908000L
+
 /* Define to the address where bug reports for this package should be sent. */
 #define PACKAGE_BUGREPORT "[email protected]"
 
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 984d63f5d77..c823655ed9a 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -151,6 +151,8 @@ sub GenerateFiles
 {
 	my $self = shift;
 	my $bits = $self->{platform} eq 'Win32' ? 32 : 64;
+	my $openssl_api_compat;
+	my $ac_define_openssl_api_compat_found = 0;
 
 	# Parse configure.in to get version numbers
 	open(my $c, '<', "configure.in")
@@ -167,10 +169,15 @@ sub GenerateFiles
 			$self->{numver} = sprintf("%d%04d", $1, $2 ? $2 : 0);
 			$self->{majorver} = sprintf("%d", $1);
 		}
+		elsif (/\bAC_DEFINE\(OPENSSL_API_COMPAT, \[([0-9xL]+)\]/)
+		{
+			$ac_define_openssl_api_compat_found = 1;
+			$openssl_api_compat = $1;
+		}
 	}
 	close($c);
 	confess "Unable to parse configure.in for all variables!"
-	  if ($self->{strver} eq '' || $self->{numver} eq '');
+	  if ($self->{strver} eq '' || $self->{numver} eq '' || $ac_define_openssl_api_compat_found == 0);
 
 	if (IsNewer("src/include/pg_config_os.h", "src/include/port/win32.h"))
 	{
@@ -254,6 +261,7 @@ sub GenerateFiles
 		if ($self->{options}->{openssl})
 		{
 			print $o "#define USE_OPENSSL 1\n";
+			print $o "#define OPENSSL_API_COMPAT $openssl_api_compat\n";
 
 			my ($digit1, $digit2, $digit3) = $self->GetOpenSSLVersion();