build OpenSceneGraph 3.0.1 for iOS - openscenegraph

Question

I'm trying to build the OpenSceneGraph for iOS as specified in the README file.
cmake -G Xcode \
-D OSG_BUILD_PLATFORM_IPHONE:BOOL=ON \
-D CMAKE_CXX_FLAGS:STRING="-ftree-vectorize -fvisibility-inlines-hidden -mno-thumb -arch armv6 -pipe -no-cpp-precomp -miphoneos-version-min=3.2 -mno-thumb" \
-D BUILD_OSG_APPLICATIONS:BOOL=OFF \
-D OSG_BUILD_FRAMEWORKS:BOOL=OFF \
-D OSG_WINDOWING_SYSTEM:STRING=IOS \
-D OSG_BUILD_PLATFORM_IPHONE:BOOL=ON \
-D CMAKE_OSX_ARCHITECTURES:STRING="armv6;armv7" \
-D CMAKE_OSX_SYSROOT:STRING=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk \
-D OSG_GL1_AVAILABLE:BOOL=OFF \
-D OSG_GL2_AVAILABLE:BOOL=OFF \
-D OSG_GLES1_AVAILABLE:BOOL=ON \
-D OSG_GL_DISPLAYLISTS_AVAILABLE:BOOL=OFF \
-D OSG_GL_FIXED_FUNCTION_AVAILABLE:BOOL=ON \
-D OSG_GL_LIBRARY_STATIC:BOOL=OFF \
-D OSG_GL_MATRICES_AVAILABLE:BOOL=ON \
-D OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE:BOOL=ON \
-D OSG_GL_VERTEX_FUNCS_AVAILABLE:BOOL=OFF \
-D DYNAMIC_OPENSCENEGRAPH:BOOL=OFF \
-D DYNAMIC_OPENTHREADS:BOOL=OFF .
But I'm getting following error.
-- The C compiler identification is GNU
-- The CXX compiler identification is unknown
-- Checking whether C compiler has -isysroot
-- Checking whether C compiler has -isysroot - yes
-- Checking whether C compiler supports OSX deployment target flag
-- Checking whether C compiler supports OSX deployment target flag - yes
-- Check for working C compiler using: Xcode
-- Check for working C compiler using: Xcode -- broken
CMake Error at /opt/local/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:52 (MESSAGE):
The C compiler "/usr/bin/gcc" is not able to compile a simple test program.
It fails with the following output:
Change Dir: /Volumes/MY_DATA/AugmentedReality/osg/OpenSceneGraph-3.0.1/CMakeFiles/CMakeTmp
Run Build Command:/opt/local/bin/cmakexbuild -project
CMAKE_TRY_COMPILE.xcodeproj build -target cmTryCompileExec -configuration
Debug
=== BUILD NATIVE TARGET cmTryCompileExec OF PROJECT CMAKE_TRY_COMPILE WITH
CONFIGURATION Debug ===
Check dependencies
target specifies product type 'com.apple.product-type.tool', but there's no
such product type for the 'iphoneos' platform
** BUILD FAILED **
The following build commands failed:
Check dependencies
(1 failure)
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:30 (PROJECT)
-- Configuring incomplete, errors occurred!
What might cause this and how do I solve it?

Answer 1

I'm trying to do the same thing and get a similar error. I found the following post indicating cmake is not yet compatible with Xcode 4 when building for iOS:
http://forum.openscenegraph.org/viewtopic.php?t=9034