Merge pull request #697 from zdenop/cmake_C17

cmake improvements

CMakeLists.txt

@@ -41,8 +41,13 @@ set_property(GLOBAL PROPERTY PREDEFINED_TARGETS_FOLDER "CMake Targets")
 
 project(
   leptonica
-  LANGUAGES C CXX
+  LANGUAGES C
   VERSION 1.84.0)
+set(CMAKE_C_STANDARD 17)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+
+# Standard installation paths
+include(GNUInstallDirs)
 
 set(MINIMUM_WEBPMUX_VERSION 0.5.0)
 

prog/CMakeLists.txt

@@ -3,10 +3,12 @@
 ########################################
 function(add_prog_target target)
     set                             (${target}_src "${ARGN}")
-    if (WIN32)
-        set_source_files_properties (${${target}_src} PROPERTIES LANGUAGE CXX)
-    endif()
     add_executable                  (${target} ${${target}_src})
+    string(FIND ${target} "gif" GIF_TEST_FOUND)
+    if (GIF_TEST_FOUND EQUAL 0)
+        # gif_lib.h is not found on Windows
+        target_include_directories  (${target} PRIVATE ${GIF_INCLUDE_DIR})
+    endif()
     if (BUILD_SHARED_LIBS)
         target_compile_definitions  (${target} PRIVATE -DLIBLEPT_IMPORTS)
     endif()

src/CMakeLists.txt

@@ -10,9 +10,6 @@
 
 file(GLOB hdr "*.h")
 file(GLOB src "*.c")
-if (MSVC)
-    set_source_files_properties(${src} PROPERTIES LANGUAGE CXX)
-endif()
 
 string(REPLACE "-O3" "-O2" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
 
@@ -73,6 +70,10 @@ if (UNIX)
     endif(SYM_LINK)
 endif()
 
+if (MSVC)
+    target_link_libraries       (leptonica PRIVATE user32.lib gdi32.lib)
+endif()
+
 if (NOT SW_BUILD)
     export(TARGETS leptonica FILE ${CMAKE_BINARY_DIR}/LeptonicaTargets.cmake)
 else()