vcpkg/ports/libpqxx/fix_build_with_vs2017.patch

diff --git a/include/pqxx/internal/header-pre.hxx b/include/pqxx/internal/header-pre.hxx
index abc1a39..cba0242 100644
--- a/include/pqxx/internal/header-pre.hxx
+++ b/include/pqxx/internal/header-pre.hxx
@@ -90,6 +90,12 @@
 // Workarounds for Microsoft Visual C++
 #  ifdef _MSC_VER
 
+ 
+// Workarounds for deprecated attribute syntax error in Visual Studio 2017.
+#    if _MSC_VER < 1920
+#      define PQXX_DEPRECATED(MESSAGE) __declspec(deprecated( #MESSAGE ))
+#    endif
+
 // Suppress vtables on abstract classes.
 #    define PQXX_NOVTABLE __declspec(novtable)
 
@@ -159,6 +165,10 @@
 #  define PQXX_NOVTABLE /* novtable */
 #endif
 
+#ifndef PQXX_DEPRECATED
+#  define PQXX_DEPRECATED(MESSAGE) [[deprecated( #MESSAGE )]]
+#endif
+
 // C++20: Assume support.
 #if defined(PQXX_HAVE_LIKELY)
 #  define PQXX_LIKELY [[likely]]
diff --git a/include/pqxx/stream_from.hxx b/include/pqxx/stream_from.hxx
index 1e8a272..299248c 100644
--- a/include/pqxx/stream_from.hxx
+++ b/include/pqxx/stream_from.hxx
@@ -160,7 +160,7 @@ public:
   /** @deprecated Use factories @ref table or @ref raw_table instead.
    */
   template<typename Iter>
-  [[deprecated("Use transaction_base::stream instead.")]] stream_from(
+  PQXX_DEPRECATED("Use transaction_base::stream instead.") stream_from(
     transaction_base &, from_table_t, std::string_view table,
     Iter columns_begin, Iter columns_end);
 
@@ -168,13 +168,13 @@ public:
   /** @deprecated Use factory function @ref query instead.
    */
   template<typename Columns>
-  [[deprecated("Use transaction_base::stream() instead.")]] stream_from(
+  PQXX_DEPRECATED("Use transaction_base::stream() instead.") stream_from(
     transaction_base &tx, from_table_t, std::string_view table,
     Columns const &columns);
 
 #include "pqxx/internal/ignore-deprecated-pre.hxx"
   /// @deprecated Use factories @ref table or @ref raw_table instead.
-  [[deprecated("Use transaction_base::stream instead.")]] stream_from(
+  PQXX_DEPRECATED("Use transaction_base::stream instead.") stream_from(
     transaction_base &tx, std::string_view table) :
           stream_from{tx, from_table, table}
   {}
@@ -182,14 +182,14 @@ public:
 
   /// @deprecated Use factories @ref table or @ref raw_table instead.
   template<typename Columns>
-  [[deprecated("Use transaction_base::stream instead.")]] stream_from(
+  PQXX_DEPRECATED("Use transaction_base::stream instead.") stream_from(
     transaction_base &tx, std::string_view table, Columns const &columns) :
           stream_from{tx, from_table, table, columns}
   {}
 
   /// @deprecated Use factories @ref table or @ref raw_table instead.
   template<typename Iter>
-  [[deprecated("Use transaction_base::stream instead.")]] stream_from(
+  PQXX_DEPRECATED("Use transaction_base::stream instead.") stream_from(
     transaction_base &, std::string_view table, Iter columns_begin,
     Iter columns_end);
 
diff --git a/include/pqxx/stream_to.hxx b/include/pqxx/stream_to.hxx
index 2a49d8f..06e602e 100644
--- a/include/pqxx/stream_to.hxx
+++ b/include/pqxx/stream_to.hxx
@@ -169,7 +169,7 @@ public:
    * your data fields and the table is explicit in your code, and not hidden
    * in an "implicit contract" between your code and your schema.
    */
-  [[deprecated("Use table() or raw_table() factory.")]] stream_to(
+  PQXX_DEPRECATED("Use table() or raw_table() factory.") stream_to(
     transaction_base &tx, std::string_view table_name) :
           stream_to{tx, table_name, ""sv}
   {}
@@ -178,14 +178,14 @@ public:
   /** @deprecated Use @ref table or @ref raw_table as a factory.
    */
   template<typename Columns>
-  [[deprecated("Use table() or raw_table() factory.")]] stream_to(
+  PQXX_DEPRECATED("Use table() or raw_table() factory.") stream_to(
     transaction_base &, std::string_view table_name, Columns const &columns);
 
   /// Create a stream, specifying column names as a sequence of strings.
   /** @deprecated Use @ref table or @ref raw_table as a factory.
    */
   template<typename Iter>
-  [[deprecated("Use table() or raw_table() factory.")]] stream_to(
+  PQXX_DEPRECATED("Use table() or raw_table() factory.") stream_to(
     transaction_base &, std::string_view table_name, Iter columns_begin,
     Iter columns_end);