first pass at universal libpng for iOS

README.md

@@ -29,6 +29,27 @@ Or generate a dual iOS/OS X-compatible Xcode project for `libllmr` to include as
 
     make xcode # then open llmr.xcodeproj
 
+## iOS
+
+For iOS you'll likely need `armv7` and `armv7s` libs for targeting devices and `i386` libs for the simulator. The best way to handle this is to build for all those architectures and then combine the libs into a single universal lib. We'll do this with the scripts from [mapnik-packaging](https://github.com/mapnik/mapnik-packaging.git)
+
+From within the `llmr-native` directory:
+
+    git clone --depth=0 https://github.com/mapnik/mapnik-packaging.git
+    cd mapnik-packaging/osx/
+    export CXX11=true
+    (source iPhoneSimulator.sh; ./scripts/build_png.sh; \
+      source MacOSX.sh; ./scripts/build_png.sh; \
+      source iPhoneOS.sh; ./scripts/build_png.sh; \
+      source iPhoneOSs.sh;  ./scripts/build_png.sh; \
+      ./scripts/make_universal.sh)
+    export UNIVERSAL_LIBS=`pwd`/out/build-cpp11-libcpp-universal/
+    export PNG_INCLUDES=`pwd`/out/build-cpp11-libcpp-i386/
+    cd ../../
+    ./configure --png-libpath=${UNIVERSAL_LIBS} --png-includes=${PNG_INCLUDES}
+
+
+
 ## Ubuntu
 
 Ensure you have git and other build essentials:

configure

@@ -34,6 +34,16 @@ parser.add_option("--png",
     dest="png",
     help="Path to png (defaults to using pkg-config)")
 
+parser.add_option("--png-includes",
+    action="store",
+    dest="png_includes",
+    help="Path to png includes")
+
+parser.add_option("--png-libpath",
+    action="store",
+    dest="png_libpath",
+    help="Path to png libs")
+
 (options, args) = parser.parse_args()
 
 def pkg_config(pkg):
@@ -60,11 +70,11 @@ def configure_glfw3(o):
   if options.glfw3:
       libpath = os.path.join(options.glfw3,'lib')
       if os.path.exists(libpath):
-          o['variables']['glfw3_libraries'] = '-L'+libpath
-      o['variables']['glfw3_libraries'] += ' -lglfw3'
+          o['variables']['glfw3_libraries'] = ['-L'+libpath]
+      o['variables']['glfw3_libraries'] += ['-lglfw3']
       incpath = os.path.join(options.glfw3,'include')
       if os.path.exists(incpath):
-          o['variables']['glfw3_cflags'] = '-I'+include
+          o['variables']['glfw3_cflags'] = ['-I'+incpath]
   else:
       ret = pkg_config('glfw3')
       if not ret:
@@ -74,14 +84,22 @@ def configure_glfw3(o):
       o['variables']['glfw3_cflags'] = ret[1].split()
 
 def configure_png(o):
-  if options.png:
-      libpath = os.path.join(options.png,'lib')
-      if os.path.exists(libpath):
-          o['variables']['png_libraries'] = '-L'+libpath
-      o['variables']['png_libraries'] += ' -lpng -lz'
-      incpath = os.path.join(options.png,'include')
-      if os.path.exists(incpath):
-          o['variables']['png_cflags'] = '-I'+include
+  if options.png or options.png_libpath or options.png_includes:
+      libpath = None
+      if options.png_libpath:
+        libpath = options.png_libpath
+      elif options.png:
+        libpath = os.path.join(options.png,'lib')
+      if libpath and os.path.exists(libpath):
+          o['variables']['png_libraries'] = ['-L'+libpath]
+      o['variables']['png_libraries'] += ['-lpng','-lz']
+      incpath = None
+      if options.png_includes:
+        incpath = options.png_includes
+      elif options.png:
+        incpath = os.path.join(options.png,'include')
+      if incpath and os.path.exists(incpath):
+          o['variables']['png_cflags'] = '-I'+incpath
   else:
       ret = pkg_config('libpng')
       if not ret: