commit 787c67afea179735f2fea12f95ad04c80b3717e7
Author:     Albrecht Schlosser <albrechts.fltk@online.de>
AuthorDate: Mon Jul 12 19:26:28 2021 +0200
Commit:     Albrecht Schlosser <albrechts.fltk@online.de>
CommitDate: Mon Jul 12 20:05:07 2021 +0200

    macOS: fix fltk_cairo shared library (issue #250)
    
    - add missing dependencies to build the shared libfltk_cairo(.dylib)
    - remove incorrect dependency on cairo from libfltk
    - add cairo_test-shared demo (linked with shared libs)

 CMakeLists.txt       |  2 +-
 cairo/CMakeLists.txt | 24 +++++++++++++++++-------
 src/CMakeLists.txt   |  4 ----
 test/CMakeLists.txt  |  6 +++++-
 4 files changed, 23 insertions(+), 13 deletions(-)

diff --git CMakeLists.txt CMakeLists.txt
index 7a05f6c..58e75be 100644
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -211,7 +211,7 @@ feature_summary (WHAT ALL DESCRIPTION "Configuration Summary for ${_descr} --\n"
 message (STATUS "Static libraries will be built in ${CMAKE_CURRENT_BINARY_DIR}/lib")
 
 if (OPTION_BUILD_SHARED_LIBS)
-  message (STATUS "Shared libraries will be built in  ${CMAKE_CURRENT_BINARY_DIR}/lib")
+  message (STATUS "Shared libraries will be built in ${CMAKE_CURRENT_BINARY_DIR}/lib")
 else ()
   message (STATUS "Shared libraries will not be built (set OPTION_BUILD_SHARED_LIBS=ON to build)")
 endif ()
diff --git cairo/CMakeLists.txt cairo/CMakeLists.txt
index 2cfa912..181f30e 100644
--- cairo/CMakeLists.txt
+++ cairo/CMakeLists.txt
@@ -1,17 +1,27 @@
 
-include_directories(${PKG_CAIRO_INCLUDE_DIRS})
+include_directories (${PKG_CAIRO_INCLUDE_DIRS})
 
 # source files for cairo
-set(cairo_SRCS Fl_Cairo.cxx)
+set (cairo_SRCS Fl_Cairo.cxx)
 
 #######################################################################
-FL_ADD_LIBRARY(fltk_cairo STATIC "${cairo_SRCS}")
+FL_ADD_LIBRARY (fltk_cairo STATIC "${cairo_SRCS}")
 
 #######################################################################
-if(OPTION_BUILD_SHARED_LIBS)
+# Build shared library (optional)
 #######################################################################
-FL_ADD_LIBRARY(fltk_cairo SHARED "${cairo_SRCS}")
 
-#######################################################################
-endif(OPTION_BUILD_SHARED_LIBS)
+if (OPTION_BUILD_SHARED_LIBS)
+
+  FL_ADD_LIBRARY (fltk_cairo SHARED "${cairo_SRCS}")
+  target_link_libraries (fltk_cairo_SHARED fltk_SHARED ${PKG_CAIRO_LIBRARIES})
+
+  if (CMAKE_VERSION VERSION_LESS "3.13")
+    link_directories (${PKG_CAIRO_LIBRARY_DIRS})
+  else()
+    target_link_directories (fltk_cairo_SHARED PRIVATE ${PKG_CAIRO_LIBRARY_DIRS})
+  endif()
+
+endif (OPTION_BUILD_SHARED_LIBS)
+
 #######################################################################
diff --git src/CMakeLists.txt src/CMakeLists.txt
index 1a614be..274df8e 100644
--- src/CMakeLists.txt
+++ src/CMakeLists.txt
@@ -519,10 +519,6 @@ if (WIN32)
   list (APPEND OPTIONAL_LIBS comctl32 ws2_32)
 endif (WIN32)
 
-if (FLTK_HAVE_CAIRO)
-  list (APPEND OPTIONAL_LIBS fltk_cairo ${PKG_CAIRO_LIBRARIES})
-endif (FLTK_HAVE_CAIRO)
-
 if (HAVE_XINERAMA)
   list (APPEND OPTIONAL_LIBS ${X11_Xinerama_LIB})
 endif (HAVE_XINERAMA)
diff --git test/CMakeLists.txt test/CMakeLists.txt
index 9c602ce..33df73a 100644
--- test/CMakeLists.txt
+++ test/CMakeLists.txt
@@ -147,7 +147,7 @@ endif (OPENGL_FOUND)
 
 # Cairo demo - must also be built w/o Cairo (displays a message box)
 if (FLTK_HAVE_CAIRO)
-  CREATE_EXAMPLE (cairo_test cairo_test.cxx "fltk_cairo;fltk")
+  CREATE_EXAMPLE (cairo_test cairo_test.cxx "fltk_cairo;fltk;cairo")
 else ()
   CREATE_EXAMPLE (cairo_test cairo_test.cxx fltk)
 endif (FLTK_HAVE_CAIRO)
@@ -206,6 +206,10 @@ if (OPTION_BUILD_SHARED_LIBS)
       CREATE_EXAMPLE (shape-shared shape.cxx "fltk_gl_SHARED;fltk_SHARED;${OPENGL_LIBRARIES}")
     endif (OPENGL_FOUND)
 
+    if (FLTK_HAVE_CAIRO)
+      CREATE_EXAMPLE (cairo_test-shared cairo_test.cxx "fltk_cairo_SHARED;fltk_SHARED;cairo")
+    endif ()
+
   endif (MSVC) # (not MSVC)
 
 endif (OPTION_BUILD_SHARED_LIBS)