1 files changed, 12 insertions, 4 deletions
diff --git a/vcl/source/filter/jpeg/jpegc.cxx b/vcl/source/filter/jpeg/jpegc.cxx
index cd87781ebd4f..ab56a35c0de7 100644
--- a/vcl/source/filter/jpeg/jpegc.cxx
+++ b/vcl/source/filter/jpeg/jpegc.cxx
@@ -55,7 +55,9 @@ struct ErrorManagerStruct
 #pragma warning(pop)
 #endif
 
-extern "C" void errorExit (j_common_ptr cinfo)
+extern "C" {
+
+static void errorExit (j_common_ptr cinfo)
 {
     char buffer[JMSG_LENGTH_MAX];
     (*cinfo->err->format_message) (cinfo, buffer);
@@ -64,19 +66,23 @@ extern "C" void errorExit (j_common_ptr cinfo)
     longjmp(error->setjmp_buffer, 1);
 }
 
-extern "C" void outputMessage (j_common_ptr cinfo)
+static void outputMessage (j_common_ptr cinfo)
 {
     char buffer[JMSG_LENGTH_MAX];
     (*cinfo->err->format_message) (cinfo, buffer);
     SAL_WARN("vcl.filter", "failure reading JPEG: " << buffer);
 }
 
+}
+
 static int GetWarningLimit()
 {
     return utl::ConfigManager::IsFuzzing() ? 5 : 1000;
 }
 
-extern "C" void emitMessage (j_common_ptr cinfo, int msg_level)
+extern "C" {
+
+static void emitMessage (j_common_ptr cinfo, int msg_level)
 {
     if (msg_level < 0)
     {
@@ -93,6 +99,8 @@ extern "C" void emitMessage (j_common_ptr cinfo, int msg_level)
         cinfo->err->output_message(cinfo);
 }
 
+}
+
 class JpegDecompressOwner
 {
 public:
@@ -139,7 +147,7 @@ struct JpegStuff
     std::vector<sal_uInt8> pCYMKBuffer;
 };
 
-void ReadJPEG(JpegStuff& rContext, JPEGReader* pJPEGReader, void* pInputStream, long* pLines,
+static void ReadJPEG(JpegStuff& rContext, JPEGReader* pJPEGReader, void* pInputStream, long* pLines,
               Size const & previewSize, GraphicFilterImportFlags nImportFlags,
               BitmapScopedWriteAccess* ppAccess)
 {