GCC 4.4 compatibility: ambiguous std::to_string() overload.

src/Magnum/AbstractShaderProgram.cpp

@@ -299,7 +299,13 @@ bool AbstractShaderProgram::link(std::initializer_list<std::reference_wrapper<Ab
             out.setFlag(Debug::NewLineAtTheEnd, false);
             out.setFlag(Debug::SpaceAfterEachValue, false);
             out << "AbstractShaderProgram::link(): linking";
-            if(shaders.size() != 1) out << " of shader " << std::to_string(i);
+            if(shaders.size() != 1) {
+                #ifndef CORRADE_GCC44_COMPATIBILITY
+                out << " of shader " << std::to_string(i);
+                #else
+                out << " of shader " << std::to_string(static_cast<long long int>(i));
+                #endif
+            }
             out << " failed with the following message:\n"
                 << message;
 
@@ -309,7 +315,13 @@ bool AbstractShaderProgram::link(std::initializer_list<std::reference_wrapper<Ab
             out.setFlag(Debug::NewLineAtTheEnd, false);
             out.setFlag(Debug::SpaceAfterEachValue, false);
             out << "AbstractShaderProgram::link(): linking";
-            if(shaders.size() != 1) out << " of shader " << std::to_string(i);
+            if(shaders.size() != 1) {
+                #ifndef CORRADE_GCC44_COMPATIBILITY
+                out << " of shader " << std::to_string(i);
+                #else
+                out << " of shader " << std::to_string(static_cast<long long int>(i));
+                #endif
+            }
             out << " succeeded with the following message:\n"
                 << message;
         }

src/Magnum/Shader.cpp

@@ -679,7 +679,13 @@ bool Shader::compile(std::initializer_list<std::reference_wrapper<Shader>> shade
             out.setFlag(Debug::SpaceAfterEachValue, false);
             out << "Shader::compile(): compilation of " << shaderName(shader._type)
                 << " shader";
-            if(shaders.size() != 1) out << ' ' << std::to_string(i);
+            if(shaders.size() != 1) {
+                #ifndef CORRADE_GCC44_COMPATIBILITY
+                out << ' ' << std::to_string(i);
+                #else
+                out << ' ' << std::to_string(static_cast<long long int>(i));
+                #endif
+            }
             out << " failed with the following message:\n"
                 << message;
 
@@ -690,7 +696,13 @@ bool Shader::compile(std::initializer_list<std::reference_wrapper<Shader>> shade
             out.setFlag(Debug::SpaceAfterEachValue, false);
             out << "Shader::compile(): compilation of " << shaderName(shader._type)
                 << " shader";
-            if(shaders.size() != 1) out << ' ' << std::to_string(i);
+            if(shaders.size() != 1) {
+                #ifndef CORRADE_GCC44_COMPATIBILITY
+                out << ' ' << std::to_string(i);
+                #else
+                out << ' ' << std::to_string(static_cast<long long int>(i));
+                #endif
+            }
             out << " succeeded with the following message:\n"
                 << message;
         }