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, 14 insertions, 14 deletions

diff --git a/public/fpdf_dataavail.h b/public/fpdf_dataavail.h
index 2413e2be7a..12a77146d7 100644
--- a/public/fpdf_dataavail.h
+++ b/public/fpdf_dataavail.h
@@ -60,13 +60,13 @@ typedef void* FPDF_AVAIL;
 // Returns a handle to the document availability provider, or NULL on error.
 //
 // |FPDFAvail_Destroy| must be called when done with the availability provider.
-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);
 
 // Destroy the |avail| document availability provider.
 //
 //   avail - handle to document availability provider to be destroyed.
-DLLEXPORT void STDCALL FPDFAvail_Destroy(FPDF_AVAIL avail);
+FPDF_EXPORT void FPDF_CALLCONV FPDFAvail_Destroy(FPDF_AVAIL avail);
 
 // Download hints interface. Used to receive hints for further downloading.
 typedef struct _FX_DOWNLOADHINTS {
@@ -106,8 +106,8 @@ typedef struct _FX_DOWNLOADHINTS {
 //
 // Once all data is available, call |FPDFAvail_GetDocument| to get a document
 // handle.
-DLLEXPORT int STDCALL
-FPDFAvail_IsDocAvail(FPDF_AVAIL avail, FX_DOWNLOADHINTS* hints);
+FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsDocAvail(FPDF_AVAIL avail,
+                                                   FX_DOWNLOADHINTS* hints);
 
 // Get document from the availability provider.
 //
@@ -118,8 +118,8 @@ FPDFAvail_IsDocAvail(FPDF_AVAIL avail, FX_DOWNLOADHINTS* hints);
 //
 // When |FPDFAvail_IsDocAvail| returns TRUE, call |FPDFAvail_GetDocument| to
 // retrieve the document handle.
-DLLEXPORT FPDF_DOCUMENT STDCALL FPDFAvail_GetDocument(FPDF_AVAIL avail,
-                                                      FPDF_BYTESTRING password);
+FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
+FPDFAvail_GetDocument(FPDF_AVAIL avail, FPDF_BYTESTRING password);
 
 // Get the page number for the first available page in a linearized PDF.
 //
@@ -130,7 +130,7 @@ DLLEXPORT FPDF_DOCUMENT STDCALL FPDFAvail_GetDocument(FPDF_AVAIL avail,
 // For most linearized PDFs, the first available page will be the first page,
 // however, some PDFs might make another page the first available page.
 // For non-linearized PDFs, this function will always return zero.
-DLLEXPORT int STDCALL FPDFAvail_GetFirstPageNum(FPDF_DOCUMENT doc);
+FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_GetFirstPageNum(FPDF_DOCUMENT doc);
 
 // Check if |page_index| is ready for loading, if not, get the
 // |FX_DOWNLOADHINTS|.
@@ -150,9 +150,9 @@ DLLEXPORT int STDCALL FPDFAvail_GetFirstPageNum(FPDF_DOCUMENT doc);
 // all the generated download |hints|, if any, until this function returns
 // |PDF_DATA_ERROR| or |PDF_DATA_AVAIL|. Applications can then perform page
 // loading.
-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);
 
 // Check if form data is ready for initialization, if not, get the
 // |FX_DOWNLOADHINTS|.
@@ -173,8 +173,8 @@ DLLEXPORT int STDCALL FPDFAvail_IsPageAvail(FPDF_AVAIL avail,
 // |PDF_FORM_ERROR|, |PDF_FORM_AVAIL| or |PDF_FORM_NOTEXIST|.
 // Applications can then perform page loading. It is recommend to call
 // |FPDFDOC_InitFormFillEnvironment| when |PDF_FORM_AVAIL| is returned.
-DLLEXPORT int STDCALL FPDFAvail_IsFormAvail(FPDF_AVAIL avail,
-                                            FX_DOWNLOADHINTS* hints);
+FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsFormAvail(FPDF_AVAIL avail,
+                                                    FX_DOWNLOADHINTS* hints);
 
 // Check whether a document is a linearized PDF.
 //
@@ -189,7 +189,7 @@ DLLEXPORT int STDCALL FPDFAvail_IsFormAvail(FPDF_AVAIL avail,
 // when we have 1k  of data. If the files size less than 1k, it returns
 // |PDF_LINEARIZATION_UNKNOWN| as there is insufficient information to determine
 // if the PDF is linearlized.
-DLLEXPORT int STDCALL FPDFAvail_IsLinearized(FPDF_AVAIL avail);
+FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsLinearized(FPDF_AVAIL avail);
 
 #ifdef __cplusplus
 }  // extern "C"