5 files changed, 8 insertions, 23 deletions
diff --git a/fpdfsdk/src/fpdf_dataavail.cpp b/fpdfsdk/src/fpdf_dataavail.cpp
index cc0833bc98..dddf9afb08 100644
--- a/fpdfsdk/src/fpdf_dataavail.cpp
+++ b/fpdfsdk/src/fpdf_dataavail.cpp
@@ -95,8 +95,6 @@ DLLEXPORT int STDCALL FPDFAvail_IsDocAvail(FPDF_AVAIL avail,
   return ((CFPDF_DataAvail*)avail)->m_pDataAvail->IsDocAvail(&hints_wrap);
 }
 
-extern void CheckUnSupportError(CPDF_Document* pDoc, FX_DWORD err_code);
-
 DLLEXPORT FPDF_DOCUMENT STDCALL
 FPDFAvail_GetDocument(FPDF_AVAIL avail, FPDF_BYTESTRING password) {
   if (avail == NULL)
diff --git a/fpdfsdk/src/fpdftext.cpp b/fpdfsdk/src/fpdftext.cpp
index 4030b7172b..43edd525e8 100644
--- a/fpdfsdk/src/fpdftext.cpp
+++ b/fpdfsdk/src/fpdftext.cpp
@@ -12,9 +12,6 @@
 #include <tchar.h>
 #endif
 
-// jabdelmalek: commented out to build on Linux.  Not used.
-// extern HANDLE g_hModule;
-
 DLLEXPORT FPDF_TEXTPAGE STDCALL FPDFText_LoadPage(FPDF_PAGE page) {
   if (!page)
     return NULL;
diff --git a/fpdfsdk/src/fpdfview.cpp b/fpdfsdk/src/fpdfview.cpp
index a1d5689c79..bed00d3172 100644
--- a/fpdfsdk/src/fpdfview.cpp
+++ b/fpdfsdk/src/fpdfview.cpp
@@ -182,8 +182,6 @@ DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadDocument(FPDF_STRING file_path,
   return pParser->GetDocument();
 }
 
-extern void CheckUnSupportError(CPDF_Document* pDoc, FX_DWORD err_code);
-
 class CMemFile final : public IFX_FileRead {
  public:
   CMemFile(uint8_t* pBuf, FX_FILESIZE size) : m_pBuf(pBuf), m_size(size) {}
diff --git a/fpdfsdk/src/fsdk_mgr.cpp b/fpdfsdk/src/fsdk_mgr.cpp
index 67dea80d0d..fa270cc289 100644
--- a/fpdfsdk/src/fsdk_mgr.cpp
+++ b/fpdfsdk/src/fsdk_mgr.cpp
@@ -916,16 +916,9 @@ FX_BOOL CPDFSDK_PageView::OnKeyDown(int nKeyCode, int nFlag) {
 }
 
 FX_BOOL CPDFSDK_PageView::OnKeyUp(int nKeyCode, int nFlag) {
-  //  if(CPDFSDK_Annot* pAnnot = GetFocusAnnot())
-  //  {
-  //      CFFL_IFormFiller* pIFormFiller = g_pFormFillApp->GetIFormFiller();
-  //      return pIFormFiller->OnKeyUp(pAnnot, nKeyCode, nFlag);
-  //  }
   return FALSE;
 }
 
-extern void CheckUnSupportAnnot(CPDF_Document* pDoc, CPDF_Annot* pPDFAnnot);
-
 void CPDFSDK_PageView::LoadFXAnnots() {
   CPDFDoc_Environment* pEnv = m_pSDKDoc->GetEnv();
 
diff --git a/fpdfsdk/src/javascript/global.cpp b/fpdfsdk/src/javascript/global.cpp
index cbb04241ae..94148762e2 100644
--- a/fpdfsdk/src/javascript/global.cpp
+++ b/fpdfsdk/src/javascript/global.cpp
@@ -38,19 +38,18 @@ struct CHash<ACC, N, Ns...> {
   static const unsigned value = CHash<CHash<ACC, N>::value, Ns...>::value;
 };
 
-extern const unsigned int JSCONST_nStringHash =
+const unsigned int JSCONST_nStringHash =
     CHash<'s', 't', 'r', 'i', 'n', 'g'>::value;
-extern const unsigned int JSCONST_nNumberHash =
+const unsigned int JSCONST_nNumberHash =
     CHash<'n', 'u', 'm', 'b', 'e', 'r'>::value;
-extern const unsigned int JSCONST_nBoolHash =
+const unsigned int JSCONST_nBoolHash =
     CHash<'b', 'o', 'o', 'l', 'e', 'a', 'n'>::value;
-extern const unsigned int JSCONST_nDateHash = CHash<'d', 'a', 't', 'e'>::value;
-extern const unsigned int JSCONST_nObjectHash =
+const unsigned int JSCONST_nDateHash = CHash<'d', 'a', 't', 'e'>::value;
+const unsigned int JSCONST_nObjectHash =
     CHash<'o', 'b', 'j', 'e', 'c', 't'>::value;
-extern const unsigned int JSCONST_nFXobjHash =
-    CHash<'f', 'x', 'o', 'b', 'j'>::value;
-extern const unsigned int JSCONST_nNullHash = CHash<'n', 'u', 'l', 'l'>::value;
-extern const unsigned int JSCONST_nUndefHash =
+const unsigned int JSCONST_nFXobjHash = CHash<'f', 'x', 'o', 'b', 'j'>::value;
+const unsigned int JSCONST_nNullHash = CHash<'n', 'u', 'l', 'l'>::value;
+const unsigned int JSCONST_nUndefHash =
     CHash<'u', 'n', 'd', 'e', 'f', 'i', 'n', 'e', 'd'>::value;
 
 #ifdef _DEBUG