Build a C++ example using XCode

[Dario Cazzola]

Hi there,

I am trying to build, compile, and run the first OpenSIm example. I am following this instructions: https://simtk-confluence.stanford.edu/p ... d=29165309

However when I try to build it using cmake (version 3.17.0), and compile using Xcode (version 11.3.1) I get the following error:

Screenshot 2020-02-18 at 16.51.20.png (156.68 KiB) Viewed 731 times

If I try to specify the compiler I get this error:

Screenshot 2020-02-18 at 16.52.09.png (204.58 KiB) Viewed 731 times

If I try t compile using Unix MakeFiles, I get this warning:

Screenshot 2020-02-18 at 16.43.20.png (200.62 KiB) Viewed 731 times

Not sure what I doing wrong, but I am certainly forgetting to do something!

Many thanks for your help.

Cheers

Dario

[Christopher Dembia]

Dario, maybe you could proceed with Unix Makefiles, because that generated only a warning, which you can hopefully ignore.

[Dario Cazzola]

Hi Chris,

I managed to resolve the compiler error when using Xcode by typing this:

Code: Select all

sudo xcode-select --reset

Apparently it is something you need to do after using homebrew.

However I now face another error in Xcode:

Code: Select all

clang: error: no such file or directory: '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Accelerate.framework' 

This is because ...SDKs/MacOSX10.14.sdk/... should be ...SDKs/MacOSX10.15.sdk/...
Not sure how to change this though.

Hope it helps.
Cheers
Dario

[Ayman Habib]

Hi Dario,

Check the CMake variable CMake_OSX_SYSROOT

and let us know,
-Ayman

[Dario Cazzola]

Hi Ayman,

Thanks for this. I did check that variable and it refers to the right path.

However I have noticed that the file XCODE_DEPEND_HELPER.make still includes the old path (i.e. MACOS_10.14.sdk).

Code: Select all

# DO NOT EDIT
# This makefile makes sure all linkable targets are
# up-to-date with anything they link to
default:
	echo "Do not invoke directly"

# Rules to remove targets that are older than anything to which they
# link.  This forces Xcode to relink the targets from scratch.  It
# does not seem to check these dependencies itself.
PostBuild.exampleMain.Debug:
/Users/dc547/Documents/OpenSim/4.0/Code/CPP/ExampleMain/build/Debug/exampleMain:\
	/Applications/OpenSim\ 4.0/sdk/lib/libosimTools.dylib\
	/Applications/OpenSim\ 4.0/sdk/lib/libosimAnalyses.dylib\
	/Applications/OpenSim\ 4.0/sdk/lib/libosimActuators.dylib\
	/Applications/OpenSim\ 4.0/sdk/lib/libosimSimulation.dylib\
	/Applications/OpenSim\ 4.0/sdk/lib/libosimCommon.dylib\
	/Applications/OpenSim\ 4.0/sdk/Simbody/lib/libSimTKsimbody.3.6.dylib\
	/Applications/OpenSim\ 4.0/sdk/Simbody/lib/libSimTKmath.3.6.dylib\
	/Applications/OpenSim\ 4.0/sdk/Simbody/lib/libSimTKcommon.3.6.dylib\
	/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Accelerate.framework\
	/Applications/OpenSim\ 4.0/sdk/lib/libosimLepton.dylib
	/bin/rm -f /Users/dc547/Documents/OpenSim/4.0/Code/CPP/ExampleMain/build/Debug/exampleMain

Thanks for your help.

Dario

[Ayman Habib]

Hi Dario,

You may need to delete the cache and rerun CMake to get a fresh XCODE_DEPEND_HELPER.cmake though I found online help that suggested this file is not used anymore (since XCode 5). Not sure since we typically do not use XCode to build on OSX.

Please let me know how it goes,
-Ayman

[Hendrik Reimann]

I had the same issue and spent a very frustrating weekend trying to solve it, so putting this here for others.

My problem was that I had an older standard install of OpenSim in the usual place (Applications/OpenSim...), which I had installed a while ago, and I had updated the OS in the meantime. When generating the XCode project, CMake used this pre-installed version of OpenSim, rather than the newer version I had built from source code more recently, and the linker complained with the above error. Pointing CMake to the right locations fixed it:

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