Cleanup warnings of -Wmissing-declarations

Add static to the functions which is not intentionally
export to big scope.

1 files changed, 4 insertions, 2 deletions

diff --git a/Source/Core/VideoBackends/Vulkan/ShaderCompiler.cpp b/Source/Core/VideoBackends/Vulkan/ShaderCompiler.cpp
index 7b6beb11b0..fb267b9319 100644
--- a/Source/Core/VideoBackends/Vulkan/ShaderCompiler.cpp
+++ b/Source/Core/VideoBackends/Vulkan/ShaderCompiler.cpp
@@ -107,8 +107,10 @@ static const char SUBGROUP_HELPER_HEADER[] = R"(
   #define SUBGROUP_MAX(value) value = subgroupMax(value)
 )";
 
-std::optional<SPIRVCodeVector> CompileShaderToSPV(EShLanguage stage, const char* stage_filename,
-                                                  std::string_view source, std::string_view header)
+static std::optional<SPIRVCodeVector> CompileShaderToSPV(EShLanguage stage,
+                                                         const char* stage_filename,
+                                                         std::string_view source,
+                                                         std::string_view header)
 {
   if (!InitializeGlslang())
     return std::nullopt;