Refactor out pragma_comp_defs

Relevant commits on the old cleanup PR:
36933c7f5c7778e2d7fbfea5361c11fb41070467
21e43de0f300ee47b7e597098908601bf591950b
3c678bb1cedfd7b865ac2e7aaf014de4bfb3eb3d

contrib/epee/include/net/abstract_tcp_server2.inl

@@ -44,8 +44,6 @@
 #include "warnings.h"
 #include "string_tools_lexical.h"
 #include "misc_language.h"
-#include "net/local_ip.h"
-#include "pragma_comp_defs.h"
 
 #include <sstream>
 #include <iomanip>
@@ -64,7 +62,6 @@
 #define TIMEOUT_EXTRA_MS_PER_BYTE 0.2
 
 
-PRAGMA_WARNING_PUSH
 namespace epee
 {
 namespace net_utils
@@ -79,8 +76,6 @@ namespace net_utils
   /************************************************************************/
   /*                                                                      */
   /************************************************************************/
-PRAGMA_WARNING_DISABLE_VS(4355)
-
   template<class t_protocol_handler>
   connection<t_protocol_handler>::connection( boost::asio::io_service& io_service,
                 std::shared_ptr<shared_state> state,
@@ -111,7 +106,6 @@ PRAGMA_WARNING_DISABLE_VS(4355)
     MDEBUG("test, connection constructor set m_connection_type="<<m_connection_type);
   }
 
-PRAGMA_WARNING_DISABLE_VS(4355)
   //---------------------------------------------------------------------------------
   template<class t_protocol_handler>
   connection<t_protocol_handler>::~connection() noexcept(false)
@@ -1092,8 +1086,6 @@ PRAGMA_WARNING_DISABLE_VS(4355)
     }
   }
   //-----------------------------------------------------------------------------
-PUSH_WARNINGS
-DISABLE_GCC_WARNING(maybe-uninitialized)
   template<class t_protocol_handler>
   bool boosted_tcp_server<t_protocol_handler>::init_server(const std::string port,  const std::string& address,
       const std::string port_ipv6, const std::string address_ipv6, bool use_ipv6, bool require_ipv4,
@@ -1113,7 +1105,6 @@ DISABLE_GCC_WARNING(maybe-uninitialized)
     }
     return this->init_server(p, address, p_ipv6, address_ipv6, use_ipv6, require_ipv4, std::move(ssl_options));
   }
-POP_WARNINGS
   //---------------------------------------------------------------------------------
   template<class t_protocol_handler>
   bool boosted_tcp_server<t_protocol_handler>::worker_thread()
@@ -1734,4 +1725,3 @@ POP_WARNINGS
   
 } // namespace
 } // namespace
-PRAGMA_WARNING_POP

contrib/epee/include/net/network_throttle.hpp

@@ -59,7 +59,6 @@
 #include <boost/asio/deadline_timer.hpp>
 #include <boost/date_time/posix_time/posix_time.hpp>
 #include "misc_language.h"
-#include "pragma_comp_defs.h"
 #include <sstream>
 #include <iomanip>
 #include <algorithm>

contrib/epee/include/pragma_comp_defs.h

@@ -1,14 +0,0 @@
-#pragma once
-
-#if defined(__GNUC__)
-  #define PRAGMA_WARNING_PUSH _Pragma("GCC diagnostic push")
-  #define PRAGMA_WARNING_POP _Pragma("GCC diagnostic pop")
-  #define PRAGMA_WARNING_DISABLE_VS(w)
-  #define PRAGMA_GCC(w) _Pragma(w)
-#elif defined(_MSC_VER)
-  #define PRAGMA_WARNING_PUSH __pragma(warning( push ))
-  #define PRAGMA_WARNING_POP __pragma(warning( pop ))
-  #define PRAGMA_WARNING_DISABLE_VS(w) __pragma( warning ( disable: w ))
-  //#define PRAGMA_WARNING_DISABLE_GCC(w)
-  #define PRAGMA_GCC(w)
-#endif

contrib/epee/include/storages/portable_storage_to_bin.h

@@ -28,7 +28,6 @@
 
 #pragma once 
 
-#include "pragma_comp_defs.h"
 #include "misc_language.h"
 #include "portable_storage_base.h"
 #include "portable_storage_bin_utils.h"
@@ -49,11 +48,6 @@ namespace epee
       return sizeof(pack_value);
     }
 
-    PRAGMA_WARNING_PUSH
-      PRAGMA_GCC("GCC diagnostic ignored \"-Wstrict-aliasing\"")
-#ifdef __clang__
-      PRAGMA_GCC("GCC diagnostic ignored \"-Wtautological-constant-out-of-range-compare\"")
-#endif
     template<class t_stream>
     size_t pack_varint(t_stream& strm, size_t val)
     {   //the first two bits always reserved for size information
@@ -70,11 +64,11 @@ namespace epee
         return pack_varint_t<uint32_t>(strm, PORTABLE_RAW_SIZE_MARK_DWORD, val);
       }else
       {
-        CHECK_AND_ASSERT_THROW_MES(val <= 4611686018427387903, "failed to pack varint - too big amount = " << val);
+        // Same as checking val <= 4611686018427387903 except that it's portable for 32-bit size_t
+        CHECK_AND_ASSERT_THROW_MES(!(val >> 31 >> 31), "failed to pack varint - too big amount = " << val);
         return pack_varint_t<uint64_t>(strm, PORTABLE_RAW_SIZE_MARK_INT64, val);
       }
     }
-    PRAGMA_WARNING_POP
 
     template<class t_stream>
     bool put_string(t_stream& strm, const std::string& v)