Add a build target and a proper export header for shared library builds.

This CL adds support for Chromium's component build feature to pdfium.

The export header stub in fpdfview.h is expanded to match Chromium's
export mechanisms and patterns (fixes pdfium:825).

A component/shared library build can be triggered by adding

is_component_build = true

as a gn argument. Please note that setting this will also affect some
of pdfiums dependencies like v8, which will be build as components
too.

Additionally, this CL provides a "pdf_source_set" template which
dynamically enables the use of "source_set" when building a complete
static library or a shared library to reduce build time.

When testing this it is recommended to only build the pdfium target as
most of pdfiums test rely on non-public functions which aren't exported
by the shared library.

Bug: pdfium:825,pdfium:826
Change-Id: Icedc538ec535e11d1e53c4d5fabc8c064b275752
Reviewed-on: https://pdfium-review.googlesource.com/8970
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 13 insertions, 13 deletions

diff --git a/fpdfsdk/fpdf_dataavail.cpp b/fpdfsdk/fpdf_dataavail.cpp
index 85dd873cf3..e365fd9313 100644
--- a/fpdfsdk/fpdf_dataavail.cpp
+++ b/fpdfsdk/fpdf_dataavail.cpp
@@ -116,8 +116,8 @@ CFPDF_DataAvail* CFPDFDataAvailFromFPDFAvail(FPDF_AVAIL avail) {
 
 }  // namespace
 
-DLLEXPORT FPDF_AVAIL STDCALL FPDFAvail_Create(FX_FILEAVAIL* file_avail,
-                                              FPDF_FILEACCESS* file) {
+FPDF_EXPORT FPDF_AVAIL FPDF_CALLCONV FPDFAvail_Create(FX_FILEAVAIL* file_avail,
+                                                      FPDF_FILEACCESS* file) {
   auto pAvail = pdfium::MakeUnique<CFPDF_DataAvail>();
   pAvail->m_FileAvail->Set(file_avail);
   pAvail->m_FileRead->Set(file);
@@ -126,13 +126,13 @@ DLLEXPORT FPDF_AVAIL STDCALL FPDFAvail_Create(FX_FILEAVAIL* file_avail,
   return pAvail.release();  // Caller takes ownership.
 }
 
-DLLEXPORT void STDCALL FPDFAvail_Destroy(FPDF_AVAIL avail) {
+FPDF_EXPORT void FPDF_CALLCONV FPDFAvail_Destroy(FPDF_AVAIL avail) {
   // Take ownership back from caller and destroy.
   std::unique_ptr<CFPDF_DataAvail>(static_cast<CFPDF_DataAvail*>(avail));
 }
 
-DLLEXPORT int STDCALL FPDFAvail_IsDocAvail(FPDF_AVAIL avail,
-                                           FX_DOWNLOADHINTS* hints) {
+FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsDocAvail(FPDF_AVAIL avail,
+                                                   FX_DOWNLOADHINTS* hints) {
   if (!avail || !hints)
     return PDF_DATA_ERROR;
   CFPDF_DownloadHintsWrap hints_wrap(hints);
@@ -140,7 +140,7 @@ DLLEXPORT int STDCALL FPDFAvail_IsDocAvail(FPDF_AVAIL avail,
       &hints_wrap);
 }
 
-DLLEXPORT FPDF_DOCUMENT STDCALL
+FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
 FPDFAvail_GetDocument(FPDF_AVAIL avail, FPDF_BYTESTRING password) {
   CFPDF_DataAvail* pDataAvail = static_cast<CFPDF_DataAvail*>(avail);
   if (!pDataAvail)
@@ -161,14 +161,14 @@ FPDFAvail_GetDocument(FPDF_AVAIL avail, FPDF_BYTESTRING password) {
   return FPDFDocumentFromCPDFDocument(pDocument.release());
 }
 
-DLLEXPORT int STDCALL FPDFAvail_GetFirstPageNum(FPDF_DOCUMENT doc) {
+FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_GetFirstPageNum(FPDF_DOCUMENT doc) {
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(doc);
   return pDoc ? pDoc->GetParser()->GetFirstPageNo() : 0;
 }
 
-DLLEXPORT int STDCALL FPDFAvail_IsPageAvail(FPDF_AVAIL avail,
-                                            int page_index,
-                                            FX_DOWNLOADHINTS* hints) {
+FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsPageAvail(FPDF_AVAIL avail,
+                                                    int page_index,
+                                                    FX_DOWNLOADHINTS* hints) {
   if (!avail || !hints)
     return PDF_DATA_ERROR;
   if (page_index < 0)
@@ -178,8 +178,8 @@ DLLEXPORT int STDCALL FPDFAvail_IsPageAvail(FPDF_AVAIL avail,
       page_index, &hints_wrap);
 }
 
-DLLEXPORT int STDCALL FPDFAvail_IsFormAvail(FPDF_AVAIL avail,
-                                            FX_DOWNLOADHINTS* hints) {
+FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsFormAvail(FPDF_AVAIL avail,
+                                                    FX_DOWNLOADHINTS* hints) {
   if (!avail || !hints)
     return PDF_FORM_ERROR;
   CFPDF_DownloadHintsWrap hints_wrap(hints);
@@ -187,7 +187,7 @@ DLLEXPORT int STDCALL FPDFAvail_IsFormAvail(FPDF_AVAIL avail,
       &hints_wrap);
 }
 
-DLLEXPORT int STDCALL FPDFAvail_IsLinearized(FPDF_AVAIL avail) {
+FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsLinearized(FPDF_AVAIL avail) {
   if (!avail)
     return PDF_LINEARIZATION_UNKNOWN;
   return CFPDFDataAvailFromFPDFAvail(avail)->m_pDataAvail->IsLinearizedPDF();