diff --git a/modules/juce_audio_processors/format_types/VST3_SDK/JUCE_README.md b/modules/juce_audio_processors/format_types/VST3_SDK/JUCE_README.md
index 8291435578..d337f051b1 100644
--- a/modules/juce_audio_processors/format_types/VST3_SDK/JUCE_README.md
+++ b/modules/juce_audio_processors/format_types/VST3_SDK/JUCE_README.md
@@ -1,2 +1,6 @@
 This list details modifications made to the VST3 SDK in order to facilitate
 inclusion in JUCE.
+
+- `#warning` directives were removed from fstring.cpp, as these cannot be
+  silenced with a `pragma GCC diagnostic ignored "-Wcpp"` when building with
+  g++.
diff --git a/modules/juce_audio_processors/format_types/VST3_SDK/base/source/fstring.cpp b/modules/juce_audio_processors/format_types/VST3_SDK/base/source/fstring.cpp
index b4294c6b40..bd48a31b98 100644
--- a/modules/juce_audio_processors/format_types/VST3_SDK/base/source/fstring.cpp
+++ b/modules/juce_audio_processors/format_types/VST3_SDK/base/source/fstring.cpp
@@ -293,7 +293,6 @@ static inline int strnicmp16 (const Steinberg::char16* s1, const Steinberg::char
 //-----------------------------------------------------------------------------
 static inline int sprintf16 (Steinberg::char16* wcs, const Steinberg::char16* format, ...)
 {
-#warning DEPRECATED No Linux implementation
     assert(false && "DEPRECATED No Linux implementation");
 	return 0;
 }
@@ -317,7 +316,6 @@ static inline int vsnwprintf (Steinberg::char16* wcs, size_t maxlen,
 //-----------------------------------------------------------------------------
 static inline Steinberg::char16* strrchr16 (const Steinberg::char16* str, Steinberg::char16 c)
 {
-#warning DEPRECATED No Linux implementation
     assert(false && "DEPRECATED No Linux implementation");
 	return nullptr;
 }
@@ -1595,7 +1593,6 @@ char16 ConstString::toLower (char16 c)
 		}
 		return c;
 	#elif SMTG_OS_LINUX
-	#warning DEPRECATED No Linux implementation
 	assert(false && "DEPRECATED No Linux implementation");
 		return c;
 	#else
@@ -1624,7 +1621,6 @@ char16 ConstString::toUpper (char16 c)
 		}
 		return c;
     #elif SMTG_OS_LINUX
-	#warning DEPRECATED No Linux implementation
 	assert(false && "DEPRECATED No Linux implementation");
 		return c;
 	#else
@@ -1923,7 +1919,6 @@ int32 ConstString::multiByteToWideString (char16* dest, const char8* source, int
 	}
 	else
 	{
-#warning DEPRECATED No Linux implementation
 		assert(false && "DEPRECATED No Linux implementation");
 	}
 
@@ -2004,7 +1999,6 @@ int32 ConstString::wideStringToMultiByte (char8* dest, const char16* wideString,
 	}
 	else
 	{
-#warning DEPRECATED No Linux implementation
 		assert(false && "DEPRECATED No Linux implementation");
 	}
 	return result;