(svn r23941) -Add: support for clang

config.lib

@@ -1159,11 +1159,11 @@ make_compiler_cflags() {
 		if [ -z "$first_time_icc_check" ]; then
 			first_time_icc_check=no
 			if [ $cc_version -lt 90 ]; then
-				log 1 "WARNING: you seem to be using very old version of ICC"
+				log 1 "WARNING: you seem to be using a very old version of ICC"
 				log 1 "WARNING: OpenTTD hasn't been tested with this version"
 				sleep 5
 			elif [ $cc_version -lt 120 ]; then
-				log 1 "WARNING: you seem to be using unsupported ICC version"
+				log 1 "WARNING: you seem to be using an unsupported ICC version"
 				log 1 "WARNING: ICC older than 12.0 is known to fail to compile OpenTTD"
 				sleep 5
 			fi
@@ -1236,6 +1236,58 @@ make_compiler_cflags() {
 				features="$features lto"
 			fi
 		fi
+	elif [ `basename $1 | grep 'clang'` ]; then
+		# Enable some things only for certain clang versions
+		cc_version="`$1 -v 2>&1 | head -n 1 | sed s@[^0-9]@@g | cut -c 1-2`"
+
+		# aliasing rules are not held in openttd code
+		flags="$flags -fno-strict-aliasing"
+
+		# -W alone doesn't enable all warnings enabled by -Wall; on the other hand,
+		# -Weverything enables too many useless warnings that can't be disabled (as of 3.0)
+		flags="$flags -Wall -W"
+
+		# warning: unused parameter '...'
+		flags="$flags -Wno-unused-parameter"
+
+		# warning: expression result unused
+		flags="$flags -Wno-unused-value"
+
+		# warning: multi-character character constant
+		flags="$flags -Wno-multichar"
+
+		# warning: explicitly assigning a variable of type '...' to itself
+		# it happens when using the FOR_ALL_WINDOWS_FROM_BACK_FROM macro
+		flags="$flags -Wno-self-assign"
+
+		if [ "$cc_version" -lt "30" ]; then
+			# warning: equality comparison with extraneous parentheses
+			flags="$flags -Wno-parentheses"
+			# warning: operands of ? are integers of different signs: 'unsigned int' and 'int'
+			flags="$flags -Wno-sign-compare"
+		fi
+
+		if [ "$cc_version" -ge "30" ]; then
+			# warning: equality comparison with extraneous parentheses
+			# this warning could be useful, but it warns about code in squirrel
+			flags="$flags -Wno-parentheses-equality"
+		fi
+
+		if [ "$with_ccache" != "0" -o "$with_distcc" != "0" ]; then
+			# ccache and distcc run separate preprocess and compile passes,
+			# both are fed with the same CFLAGS. Unfortunately, clang
+			# complains about -I when compiling preprocessed files:
+			# "clang: warning: argument unused during compilation: '-I /usr/include'"
+			flags="$flags -Qunused-arguments"
+		fi
+
+		if [ "$enable_assert" -eq "0" ]; then
+			# do not warn about unused variables when building without asserts
+			flags="$flags -Wno-unused-variable"
+		fi
+
+		# rdynamic is used to get useful stack traces from crash reports.
+		ldflags="$ldflags -rdynamic"
 	else
 		# Enable some things only for certain GCC versions
 		cc_version=`$1 -dumpversion | cut -c 1,3`

readme.txt

@@ -1,5 +1,5 @@
 OpenTTD readme
-Last updated:    2012-02-04
+Last updated:    2012-02-12
 Release version: 1.2.0-beta4
 ------------------------------------------------------------------------
 
@@ -501,6 +501,8 @@ The following compilers are known to compile OpenTTD:
     Versions 4.4 - 4.6 give bogus warnings about freeing non-heap objects.
     Versions 4.5 and later give invalid warnings when lto is enabled.
   - Intel C++ Compiler (ICC) 12.0.
+  - Clang/LLVM 2.9 - 3.0
+    Version 2.9 gives bogus warnings about code nonconformity.
 
 The following compilers are known not to compile OpenTTD:
   - Microsoft Visual C++ (MSVC) 2003 and earlier.
@@ -510,7 +512,7 @@ The following compilers are known not to compile OpenTTD:
     Version 10.0 and earlier fail a configure check and fail with recent system
         headers.
     Version 10.1 fails to compile station_gui.cpp.
-    Version 11.1 fails with internal error when compiling network.cpp.
+    Version 11.1 fails with an internal error when compiling network.cpp.
   - Clang/LLVM 2.8 and earlier.
   - (Open) Watcom.
 

src/core/pool_func.hpp

@@ -107,7 +107,11 @@ DEFINE_POOL_METHOD(inline void *)::AllocateItem(size_t size, size_t index)
 		assert(sizeof(Titem) == size);
 		item = (Titem *)this->alloc_cache;
 		this->alloc_cache = this->alloc_cache->next;
-		if (Tzero) MemSetT(item, 0);
+		if (Tzero) {
+			/* Explicitly casting to (void *) prevets a clang warning -
+			 * we are actually memsetting a (not-yet-constructed) object */
+			memset((void *)item, 0, sizeof(Titem));
+		}
 	} else if (Tzero) {
 		item = (Titem *)CallocT<byte>(size);
 	} else {

src/network/network_server.cpp

@@ -2100,11 +2100,18 @@ void NetworkPrintClients()
 {
 	NetworkClientInfo *ci;
 	FOR_ALL_CLIENT_INFOS(ci) {
-		IConsolePrintF(CC_INFO, _network_server ? "Client #%1d  name: '%s'  company: %1d  IP: %s" : "Client #%1d  name: '%s'  company: %1d",
+		if (_network_server) {
+			IConsolePrintF(CC_INFO, "Client #%1d  name: '%s'  company: %1d  IP: %s",
 					ci->client_id,
 					ci->client_name,
 					ci->client_playas + (Company::IsValidID(ci->client_playas) ? 1 : 0),
-				_network_server ? (ci->client_id == CLIENT_ID_SERVER ? "server" : NetworkClientSocket::GetByClientID(ci->client_id)->GetClientIP()) : "");
+					ci->client_id == CLIENT_ID_SERVER ? "server" : NetworkClientSocket::GetByClientID(ci->client_id)->GetClientIP());
+		} else {
+			IConsolePrintF(CC_INFO, "Client #%1d  name: '%s'  company: %1d",
+					ci->client_id,
+					ci->client_name,
+					ci->client_playas + (Company::IsValidID(ci->client_playas) ? 1 : 0));
+		}
 	}
 }
 

src/script/api/script_object.hpp

@@ -33,6 +33,7 @@ typedef bool (ScriptModeProc)();
  */
 class ScriptObject : public SimpleCountedObject {
 friend class ScriptInstance;
+friend class ScriptController;
 protected:
 	/**
 	 * A class that handles the current active instance. By instantiating it at

src/script/api/script_vehiclelist.cpp

@@ -123,7 +123,7 @@ ScriptVehicleList_DefaultGroup::ScriptVehicleList_DefaultGroup(ScriptVehicle::Ve
 	const Vehicle *v;
 	FOR_ALL_VEHICLES(v) {
 		if (v->owner == ScriptObject::GetCompany() && v->IsPrimaryVehicle()) {
-			if (v->type == vehicle_type && v->group_id == ScriptGroup::GROUP_DEFAULT) this->AddItem(v->index);
+			if (v->type == (::VehicleType)vehicle_type && v->group_id == ScriptGroup::GROUP_DEFAULT) this->AddItem(v->index);
 		}
 	}
 }

src/strings.cpp

@@ -288,7 +288,7 @@ static char *FormatNumber(char *buff, int64 number, const char *last, const char
 			quot = num / divisor;
 			num = num % divisor;
 		}
-		if (tot |= quot || i >= max_digits - zerofill) {
+		if ((tot |= quot) || i >= max_digits - zerofill) {
 			buff += seprintf(buff, last, "%i", (int)quot);
 			if ((i % 3) == thousands_offset && i < max_digits - 1 - fractional_digits) buff = strecpy(buff, separator, last);
 		}