toolchain: gcc: 14/15: fix libcody compilation with GCC16

libcody will fail to build if building using a GCC16 host compiler, so
backport the upstream fix.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
(cherry picked from commit e7e5d47)

Author: robimarko

toolchain/gcc/patches-14.x/004-libcody-Make-it-buildable-by-C-11-to-C-26.patch

@@ -0,0 +1,259 @@
+From daa3e1ead791bc58208043cfc4595ba1a78cdd34 Mon Sep 17 00:00:00 2001
+From: Jakub Jelinek <jakub@redhat.com>
+Date: Fri, 21 Nov 2025 16:25:58 +0100
+Subject: [PATCH] libcody: Make it buildable by C++11 to C++26
+
+The following builds with -std=c++11 and c++14 and c++17 and c++20 and c++23
+and c++26.
+
+I see the u8 string literals are mixed e.g. with strerror, so in
+-fexec-charset=IBM1047 there will still be garbage, so am not 100% sure if
+the u8 literals everywhere are worth it either.
+
+2025-11-21  Jakub Jelinek  <jakub@redhat.com>
+
+	* cody.hh (S2C): For __cpp_char8_t >= 201811 use char8_t instead of
+	char in argument type.
+	(MessageBuffer::Space): Revert 2025-11-15 change.
+	(MessageBuffer::Append): For __cpp_char8_t >= 201811 add overload
+	with char8_t const * type of first argument.
+	(Packet::Packet): Similarly for first argument.
+	* client.cc (CommunicationError, Client::ProcessResponse,
+	Client::Connect, ConnectResponse, PathnameResponse, OKResponse,
+	IncludeTranslateResponse): Cast u8 string literals to (const char *)
+	where needed.
+	* server.cc (Server::ProcessRequests, ConnectRequest): Likewise.
+
+(cherry picked from commit 07a767c7a50d1daae8ef7d4aba73fe53ad40c0b7)
+---
+ libcody/client.cc | 36 +++++++++++++++++++-----------------
+ libcody/cody.hh   | 22 ++++++++++++++++++++++
+ libcody/server.cc | 28 ++++++++++++++--------------
+ 3 files changed, 55 insertions(+), 31 deletions(-)
+
+diff --git a/libcody/client.cc b/libcody/client.cc
+index ae69d190cb7..147fecdbe50 100644
+--- a/libcody/client.cc
++++ b/libcody/client.cc
+@@ -97,7 +97,7 @@ int Client::CommunicateWithServer ()
+ 
+ static Packet CommunicationError (int err)
+ {
+-  std::string e {u8"communication error:"};
++  std::string e {(const char *) u8"communication error:"};
+   e.append (strerror (err));
+ 
+   return Packet (Client::PC_ERROR, std::move (e));
+@@ -110,33 +110,34 @@ Packet Client::ProcessResponse (std::vector<std::string> &words,
+     {
+       if (e == EINVAL)
+ 	{
+-	  std::string msg (u8"malformed string '");
++	  std::string msg ((const char *) u8"malformed string '");
+ 	  msg.append (words[0]);
+-	  msg.append (u8"'");
++	  msg.append ((const char *) u8"'");
+ 	  return Packet (Client::PC_ERROR, std::move (msg));
+ 	}
+       else
+-	return Packet (Client::PC_ERROR, u8"missing response");
++	return Packet (Client::PC_ERROR, (const char *) u8"missing response");
+     }
+ 
+   Assert (!words.empty ());
+-  if (words[0] == u8"ERROR")
++  if (words[0] == (const char *) u8"ERROR")
+     return Packet (Client::PC_ERROR,
+-		   words.size () == 2 ? words[1]: u8"malformed error response");
++		   words.size () == 2 ? words[1]
++		   : (const char *) u8"malformed error response");
+ 
+   if (isLast && !read.IsAtEnd ())
+     return Packet (Client::PC_ERROR,
+-		   std::string (u8"unexpected extra response"));
++		   std::string ((const char *) u8"unexpected extra response"));
+ 
+   Assert (code < Detail::RC_HWM);
+   Packet result (responseTable[code] (words));
+   result.SetRequest (code);
+   if (result.GetCode () == Client::PC_ERROR && result.GetString ().empty ())
+     {
+-      std::string msg {u8"malformed response '"};
++      std::string msg {(const char *) u8"malformed response '"};
+ 
+       read.LexedLine (msg);
+-      msg.append (u8"'");
++      msg.append ((const char *) u8"'");
+       result.GetString () = std::move (msg);
+     }
+   else if (result.GetCode () == Client::PC_CONNECT)
+@@ -199,7 +200,7 @@ Packet Client::Connect (char const *agent, char const *ident,
+ 			  size_t alen, size_t ilen)
+ {
+   write.BeginLine ();
+-  write.AppendWord (u8"HELLO");
++  write.AppendWord ((const char *) u8"HELLO");
+   write.AppendInteger (Version);
+   write.AppendWord (agent, true, alen);
+   write.AppendWord (ident, true, ilen);
+@@ -211,7 +212,8 @@ Packet Client::Connect (char const *agent, char const *ident,
+ // HELLO $version $agent [$flags]
+ Packet ConnectResponse (std::vector<std::string> &words)
+ {
+-  if (words[0] == u8"HELLO" && (words.size () == 3 || words.size () == 4))
++  if (words[0] == (const char *) u8"HELLO"
++      && (words.size () == 3 || words.size () == 4))
+     {
+       char *eptr;
+       unsigned long val = strtoul (words[1].c_str (), &eptr, 10);
+@@ -247,7 +249,7 @@ Packet Client::ModuleRepo ()
+ // PATHNAME $dir | ERROR
+ Packet PathnameResponse (std::vector<std::string> &words)
+ {
+-  if (words[0] == u8"PATHNAME" && words.size () == 2)
++  if (words[0] == (const char *) u8"PATHNAME" && words.size () == 2)
+     return Packet (Client::PC_PATHNAME, std::move (words[1]));
+ 
+   return Packet (Client::PC_ERROR, u8"");
+@@ -256,7 +258,7 @@ Packet PathnameResponse (std::vector<std::string> &words)
+ // OK or ERROR
+ Packet OKResponse (std::vector<std::string> &words)
+ {
+-  if (words[0] == u8"OK")
++  if (words[0] == (const char *) u8"OK")
+     return Packet (Client::PC_OK);
+   else
+     return Packet (Client::PC_ERROR,
+@@ -319,11 +321,11 @@ Packet Client::IncludeTranslate (char const *include, Flags flags, size_t ilen)
+ // PATHNAME $cmifile
+ Packet IncludeTranslateResponse (std::vector<std::string> &words)
+ {
+-  if (words[0] == u8"BOOL" && words.size () == 2)
++  if (words[0] == (const char *) u8"BOOL" && words.size () == 2)
+     {
+-      if (words[1] == u8"FALSE")
+-	return Packet (Client::PC_BOOL, 0);
+-      else if (words[1] == u8"TRUE")
++      if (words[1] == (const char *) u8"FALSE")
++	return Packet (Client::PC_BOOL);
++      else if (words[1] == (const char *) u8"TRUE")
+ 	return Packet (Client::PC_BOOL, 1);
+       else
+ 	return Packet (Client::PC_ERROR, u8"");
+diff --git a/libcody/cody.hh b/libcody/cody.hh
+index 789ce9e70b7..93bce93aa94 100644
+--- a/libcody/cody.hh
++++ b/libcody/cody.hh
+@@ -47,12 +47,21 @@ namespace Detail  {
+ 
+ // C++11 doesn't have utf8 character literals :(
+ 
++#if __cpp_char8_t >= 201811
++template<unsigned I>
++constexpr char S2C (char8_t const (&s)[I])
++{
++  static_assert (I == 2, "only single octet strings may be converted");
++  return s[0];
++}
++#else
+ template<unsigned I>
+ constexpr char S2C (char const (&s)[I])
+ {
+   static_assert (I == 2, "only single octet strings may be converted");
+   return s[0];
+ }
++#endif
+ 
+ /// Internal buffering class.  Used to concatenate outgoing messages
+ /// and Lex incoming ones.
+@@ -123,6 +132,13 @@ public:
+       Space ();
+     Append (str, maybe_quote, len);
+   }
++#if __cpp_char8_t >= 201811
++  void AppendWord (char8_t const *str, bool maybe_quote = false,
++		   size_t len = ~size_t (0))
++  {
++    AppendWord ((const char *) str, maybe_quote, len);
++  }
++#endif
+   /// Add a word as with AppendWord
+   /// @param str the string to append
+   /// @param maybe_quote string might need quoting, as for Append
+@@ -264,6 +280,12 @@ public:
+     : string (s), cat (STRING), code (c)
+   {
+   }
++#if __cpp_char8_t >= 201811
++  Packet (unsigned c, const char8_t *s)
++    : string ((const char *) s), cat (STRING), code (c)
++  {
++  }
++#endif
+   Packet (unsigned c, std::vector<std::string> &&v)
+     : vector (std::move (v)), cat (VECTOR), code (c)
+   {
+diff --git a/libcody/server.cc b/libcody/server.cc
+index e2fa069bb93..c18469fae84 100644
+--- a/libcody/server.cc
++++ b/libcody/server.cc
+@@ -36,12 +36,12 @@ static RequestPair
+   const requestTable[Detail::RC_HWM] =
+   {
+     // Same order as enum RequestCode
+-    RequestPair {u8"HELLO", nullptr},
+-    RequestPair {u8"MODULE-REPO", ModuleRepoRequest},
+-    RequestPair {u8"MODULE-EXPORT", ModuleExportRequest},
+-    RequestPair {u8"MODULE-IMPORT", ModuleImportRequest},
+-    RequestPair {u8"MODULE-COMPILED", ModuleCompiledRequest},
+-    RequestPair {u8"INCLUDE-TRANSLATE", IncludeTranslateRequest},
++    RequestPair {(const char *) u8"HELLO", nullptr},
++    RequestPair {(const char *) u8"MODULE-REPO", ModuleRepoRequest},
++    RequestPair {(const char *) u8"MODULE-EXPORT", ModuleExportRequest},
++    RequestPair {(const char *) u8"MODULE-IMPORT", ModuleImportRequest},
++    RequestPair {(const char *) u8"MODULE-COMPILED", ModuleCompiledRequest},
++    RequestPair {(const char *) u8"INCLUDE-TRANSLATE", IncludeTranslateRequest},
+   };
+ }
+ 
+@@ -135,21 +135,21 @@ void Server::ProcessRequests (void)
+ 	  std::string msg;
+ 
+ 	  if (err > 0)
+-	    msg = u8"error processing '";
++	    msg = (const char *) u8"error processing '";
+ 	  else if (ix >= Detail::RC_HWM)
+-	    msg = u8"unrecognized '";
++	    msg = (const char *) u8"unrecognized '";
+ 	  else if (IsConnected () && ix == Detail::RC_CONNECT)
+-	    msg = u8"already connected '";
++	    msg = (const char *) u8"already connected '";
+ 	  else if (!IsConnected () && ix != Detail::RC_CONNECT)
+-	    msg = u8"not connected '";
++	    msg = (const char *) u8"not connected '";
+ 	  else
+-	    msg = u8"malformed '";
++	    msg = (const char *) u8"malformed '";
+ 
+ 	  read.LexedLine (msg);
+-	  msg.append (u8"'");
++	  msg.append ((const char *) u8"'");
+ 	  if (err > 0)
+ 	    {
+-	      msg.append (u8" ");
++	      msg.append ((const char *) u8" ");
+ 	      msg.append (strerror (err));
+ 	    }
+ 	  resolver->ErrorResponse (this, std::move (msg));
+@@ -176,7 +176,7 @@ Resolver *ConnectRequest (Server *s, Resolver *r,
+     return nullptr;
+ 
+   if (words.size () == 3)
+-    words.emplace_back (u8"");
++    words.emplace_back ((const char *) u8"");
+   unsigned version = ParseUnsigned (words[1]);
+   if (version == ~0u)
+     return nullptr;
+-- 
+2.53.0
+