CMakeLists.txt: Support building as shared library (as one would need…

… for packaging a DEB package).
ftylitak · Oct 12, 2022 · bd3ccbe · bd3ccbe
1 parent 4f3a13f
commit bd3ccbe
Showing 1 changed file with 60 additions and 8 deletions.
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
@@ -1,6 +1,27 @@
 cmake_minimum_required(VERSION 3.3)
 project(QZXing)
 
+option(BUILD_SHARED "Build as shared library" OFF)
+
+if(BUILD_SHARED)
+    SET(SOVERSION_MAJOR 3)
+    SET(SOVERSION_MINOR 3)
+    SET(SOVERSION_PATCH 0)
+
+    OPTION(QZXING_MULTIMEDIA "" OFF)
+    OPTION(QZXING_USE_QML "" OFF)
+    OPTION(QZXING_USE_ENCODER "" OFF)
+    OPTION(QZXING_MULTIMEDIA "" OFF)
+    OPTION(QZXING_USE_QML "" OFF)
+    OPTION(QZXING_USE_ENCODER "" OFF)
+    OPTION(QZXING_USE_DECODER_QR_CODE "" OFF)
+    OPTION(QZXING_USE_DECODER_1D_BARCODES "" OFF)
+    OPTION(QZXING_USE_DECODER_DATA_MATRIX "" OFF)
+    OPTION(QZXING_USE_DECODER_AZTEC "" OFF)
+    OPTION(QZXING_USE_DECODER_PDF17 "" OFF)
+    OPTION(QZXING_USE_DECODER_1D_BARCODES "" OFF)
+endif()
+
 find_package(Qt5 COMPONENTS Core REQUIRED)
 find_package(Qt5 COMPONENTS Gui REQUIRED)
 find_package(Qt5 COMPONENTS Multimedia )
@@ -13,20 +34,25 @@ SET(ZXING_DIR  ${CMAKE_CURRENT_SOURCE_DIR}/zxing/zxing)
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_WARN_ON)
 
+set(PUBLIC_HEADERS
+    QZXing.h
+    QZXing_global.h
+)
+
 set(SOURCES
 
     CameraImageWrapper.cpp
     CameraImageWrapper.h
     ImageHandler.cpp
     ImageHandler.h
     QZXing.cpp
-    QZXing.h
-    QZXing_global.h
+    ${PUBLIC_HEADERS}
     )
 
 if(QZXING_MULTIMEDIA)
 
     LIST(APPEND SOURCES QZXingFilter.cpp QZXingFilter.h)
+    LIST(APPEND PUBLIC_HEADERS QZXingFilter.h)
     add_definitions(-DQZXING_MULTIMEDIA)
 
     SET(QZXING_USE_QML ON)
@@ -35,14 +61,24 @@ endif(QZXING_MULTIMEDIA)
 
 if(QZXING_USE_QML)
     LIST(APPEND SOURCES QZXingImageProvider.cpp QZXingImageProvider.h)
+    LIST(APPEND PUBLIC_HEADERS QZXingImageProvider.h)
     add_definitions(-DQZXING_QML)
 endif(QZXING_USE_QML)
 
 if(QZXING_USE_ENCODER)
     add_definitions(-DENABLE_ENCODER_GENERIC -DENABLE_ENCODER_QR_CODE)
 endif(QZXING_USE_ENCODER)
 
-add_library(qzxing "" ${SOURCES})
+if(BUILD_SHARED)
+    add_library(qzxing SHARED ${SOURCES})
+    set_target_properties(qzxing
+        PROPERTIES
+        VERSION ${SOVERSION_MAJOR}.${SOVERSION_MINOR}.${SOVERSION_PATCH}
+        SOVERSION ${SOVERSION_MAJOR}
+)
+else()
+    add_library(qzxing "" ${SOURCES})
+endif()
 
 if(WIN32)
     add_subdirectory(zxing/win32)
@@ -108,9 +144,10 @@ if(QZXING_USE_DECODER_1D_BARCODES)
     target_compile_definitions(qzxing PRIVATE -DENABLE_DECODER_1D_BARCODES)
 endif()
 
-
-# Change Global Definitions depending on how you want to use the library
-target_compile_definitions(qzxing PUBLIC DISABLE_LIBRARY_FEATURES)
+if(!BUILD_SHARED)
+    # Change Global Definitions depending on how you want to use the library
+    target_compile_definitions(qzxing PUBLIC DISABLE_LIBRARY_FEATURES)
+endif()
 
 # Target includes
 target_include_directories(qzxing
@@ -120,7 +157,22 @@ target_include_directories(qzxing
         zxing/win32/zxing
         zxing/zxing
         zxing/bigint
-    PUBLIC
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+  PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+)
+
+include (GNUInstallDirs)
+
+# TODO: find a working generator expression for this... :-/
+set(QZXING_INSTALL_TARGETS qzxing)
+
+install (
+    TARGETS ${QZXING_INSTALL_TARGETS} EXPORT QZXingTargets
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
 )
 
+install (
+    FILES ${PUBLIC_HEADERS} DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/qzxing"
+)