Build script: add -s for static build (WIP)

This is a working progress and doesn't produce a valid build yet.

Note that I don't plan to include static libs in the weekly builds. The static builds will only by available via the build script.
See: #36, #84, #180, #201
Also relevant: #219

The test build doesn't currently work and returns errors like:

```
/usr/bin/ld: unknown architecture of input file `/data/pdfium-binaries/staging/lib/libpdfium.a(fpdf_formfill.o)' is incompatible with i386:x86-64 output
```

I managed to make it pass by installing `lld` and passing `CMAKE_EXE_LINKER_FLAGS=-Wl,-m,elf_x86_64,-fuse-ld=lld`, but the executable crashed, so I prefered not to include this change.

Author: bblanchon

build.sh

@@ -24,11 +24,12 @@ Options:
   -b branch = Chromium branch (default=main)
   -g 0-10   = Go immediately to step n (default=0)
   -d        = debug build
+  -s        = static build (experimental)
   -j        = enable v8"
   exit
 fi
 
-while getopts "b:djmg:" OPTION
+while getopts "b:djmsg:" OPTION
 do
   case $OPTION in
     b)
@@ -43,6 +44,10 @@ do
       export PDFium_ENABLE_V8=true
       ;;
 
+    s)
+      export PDFium_BUILD_TYPE="static"
+      ;;
+
     g)
       START_STEP="$OPTARG"
       ;;

patches/PDFiumStaticConfig.cmake

@@ -0,0 +1,55 @@
+# PDFium Package Configuration for CMake
+#
+# To use PDFium in your CMake project:
+#
+#   1. set the environment variable PDFium_DIR to the folder containing this file.
+#   2. in your CMakeLists.txt, add
+#       find_package(PDFium)
+#   3. then link your executable with PDFium
+#       target_link_libraries(my_exe pdfium)
+
+include(FindPackageHandleStandardArgs)
+
+find_path(PDFium_INCLUDE_DIR
+    NAMES "fpdfview.h"
+    PATHS "${CMAKE_CURRENT_LIST_DIR}"
+    PATH_SUFFIXES "include"
+)
+
+set(PDFium_VERSION "#VERSION#")
+
+if(WIN32)
+  find_file(PDFium_LIBRARY
+        NAMES "pdfium.lib"
+        PATHS "${CMAKE_CURRENT_LIST_DIR}"
+        PATH_SUFFIXES "lib")
+
+  add_library(pdfium STATIC IMPORTED)
+  set_target_properties(pdfium
+    PROPERTIES
+    IMPORTED_LOCATION             "${PDFium_LIBRARY}"
+    INTERFACE_INCLUDE_DIRECTORIES "${PDFium_INCLUDE_DIR};${PDFium_INCLUDE_DIR}/cpp"
+  )
+
+  find_package_handle_standard_args(PDFium
+    REQUIRED_VARS PDFium_LIBRARY PDFium_INCLUDE_DIR
+    VERSION_VAR PDFium_VERSION
+  )
+else()
+  find_library(PDFium_LIBRARY
+        NAMES "pdfium"
+        PATHS "${CMAKE_CURRENT_LIST_DIR}"
+        PATH_SUFFIXES "lib")
+
+  add_library(pdfium STATIC IMPORTED)
+  set_target_properties(pdfium
+    PROPERTIES
+    IMPORTED_LOCATION             "${PDFium_LIBRARY}"
+    INTERFACE_INCLUDE_DIRECTORIES "${PDFium_INCLUDE_DIR};${PDFium_INCLUDE_DIR}/cpp"
+  )
+
+  find_package_handle_standard_args(PDFium
+    REQUIRED_VARS PDFium_LIBRARY PDFium_INCLUDE_DIR
+    VERSION_VAR PDFium_VERSION
+  )
+endif()

steps/03-patch.sh

@@ -6,6 +6,7 @@ OS="${PDFium_TARGET_OS:?}"
 TARGET_CPU="${PDFium_TARGET_CPU:?}"
 TARGET_ENVIRONMENT="${PDFium_TARGET_ENVIRONMENT:-}"
 ENABLE_V8=${PDFium_ENABLE_V8:-false}
+BUILD_TYPE=${PDFium_BUILD_TYPE:-shared}
 
 apply_patch() {
   local FILE="$1"
@@ -15,7 +16,7 @@ apply_patch() {
 
 pushd "${SOURCE}"
 
-[ "$OS" != "emscripten" ] && apply_patch "$PATCHES/shared_library.patch"
+[ "$BUILD_TYPE" == "shared" ] && [ "$OS" != "emscripten" ] && apply_patch "$PATCHES/shared_library.patch"
 apply_patch "$PATCHES/public_headers.patch"
 
 [ "$ENABLE_V8" == "true" ] && apply_patch "$PATCHES/v8/pdfium.patch"

steps/05-configure.sh

@@ -7,6 +7,7 @@ TARGET_CPU=${PDFium_TARGET_CPU:?}
 TARGET_ENVIRONMENT=${PDFium_TARGET_ENVIRONMENT:-}
 ENABLE_V8=${PDFium_ENABLE_V8:-false}
 IS_DEBUG=${PDFium_IS_DEBUG:-false}
+BUILD_TYPE=${PDFium_BUILD_TYPE:-shared}
 
 mkdir -p "$BUILD"
 
@@ -26,6 +27,10 @@ mkdir -p "$BUILD"
     echo "v8_enable_i18n_support = false"
   fi
 
+  if [ "$BUILD_TYPE" == "static" ]; then
+    echo "pdf_is_complete_lib = true"
+  fi
+
   case "$OS" in
     android)
       echo "clang_use_chrome_plugins = false"

steps/07-stage.sh

@@ -4,6 +4,7 @@ IS_DEBUG=${PDFium_IS_DEBUG:-false}
 OS=${PDFium_TARGET_OS:?}
 VERSION=${PDFium_VERSION:-}
 PATCHES="$PWD/patches"
+BUILD_TYPE=${PDFium_BUILD_TYPE:-shared}
 
 SOURCE=${PDFium_SOURCE_DIR:-pdfium}
 BUILD=${PDFium_BUILD_DIR:-pdfium/out}
@@ -16,7 +17,15 @@ mkdir -p "$STAGING"
 rm -rf "$STAGING"/*
 mkdir -p "$STAGING_LIB"
 
-sed "s/#VERSION#/${VERSION:-0.0.0.0}/" <"$PATCHES/PDFiumConfig.cmake" >"$STAGING/PDFiumConfig.cmake"
+case "$BUILD_TYPE" in
+  shared)
+    CMAKE_CONFIG_FILE="PDFiumConfig.cmake"
+    ;;
+  static)
+    CMAKE_CONFIG_FILE="PDFiumStaticConfig.cmake"
+    ;;
+esac
+sed "s/#VERSION#/${VERSION:-0.0.0.0}/" <"$PATCHES/$CMAKE_CONFIG_FILE" >"$STAGING/PDFiumConfig.cmake"
 
 cp LICENSE "$STAGING"
 cat >>"$STAGING/LICENSE" <<END
@@ -30,29 +39,37 @@ rm -f "$STAGING/include/DEPS"
 rm -f "$STAGING/include/README"
 rm -f "$STAGING/include/PRESUBMIT.py"
 
-case "$OS" in
-  android|linux)
+case "$OS-$BUILD_TYPE" in
+  android-shared|linux-shared)
     mv "$BUILD/libpdfium.so" "$STAGING_LIB"
     ;;
 
-  mac|ios)
+  android-static|linux-static|mac-static|ios-static)
+    mv "$BUILD/obj/libpdfium.a" "$STAGING_LIB"
+    ;;
+
+  mac-shared|ios-shared)
     mv "$BUILD/libpdfium.dylib" "$STAGING_LIB"
     ;;
 
-  emscripten)
+  emscripten-*)
     mv "$BUILD/pdfium.html" "$STAGING_LIB"
     mv "$BUILD/pdfium.js" "$STAGING_LIB"
     mv "$BUILD/pdfium.wasm" "$STAGING_LIB"
     rm -rf "$STAGING/include/cpp"
     rm "$STAGING/PDFiumConfig.cmake"
     ;;
 
-  win)
+  win-shared)
     mv "$BUILD/pdfium.dll.lib" "$STAGING_LIB"
     mkdir -p "$STAGING_BIN"
     mv "$BUILD/pdfium.dll" "$STAGING_BIN"
     [ "$IS_DEBUG" == "true" ] && mv "$BUILD/pdfium.dll.pdb" "$STAGING_BIN"
     ;;
+
+  win-shared)
+    mv "$BUILD/obj/pdfium.lib" "$STAGING_LIB"
+    ;;
 esac
 
 if [ -n "$VERSION" ]; then