libstdc++ removed from XCode 10, compile of mjdgges fails on MacOS Mojave

I had the bad idea to upgrade to Mojave (or to upgrade XCode, not clear ...): it seems libstdc++ is no longer there. after changing on the command line the compilation call in the build/matlab/mjdgges directory, by using

-lc++

instead of

-lstdc++

compilation went OK. Perhaps we should add detection for Darwin and use 'libc++' if detected ?

changed title from libstdc++ removed from XCode 10, compile of mjdgges fails on McOS Mojave to libstdc++ removed from XCode 10, compile of mjdgges fails on MacOS Mojave

@rattoma what is the output of gcc --version and what Matlab are you building against?

Though I get a deprecation warning when compiling against libstdc++, I have no trouble compiling on Mojave

@houtanb here is the output of gcc --version

Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/c++/4.2.1
Apple LLVM version 10.0.0 (clang-1000.11.45.5)
Target: x86_64-apple-darwin18.0.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

I am using matlab 2017b.

By the way, I managed to compile everything until before the Xmas break: then I updated/upgraded MacOS, XCode and Homebrew. Apparently (also browsing the internet) most recent versions of Xcode do not include libstdc++.

Ah, I think the difference is that you use XCode. Do you need it for something else on your system? If not, you can uninstall it. It takes up a lot of space. Instead of using Xcode, you can install the macOS command line tools: xcode-select --install. I didn't know that, but I guess there's a difference between the command line tools and the build tools packaged in XCode.

Once you do that, the output of gcc --version will be:

Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 10.0.0 (clang-1000.10.44.4)
Target: x86_64-apple-darwin18.2.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

@houtanb thank you. removing XCode and using the macOS command line tools I still get

clang: warning: libstdc++ is deprecated; move to libc++ with a minimum deployment target of OS X 10.9 [-Wdeprecated]
ld: library not found for -lstdc++
clang: error: linker command failed with exit code 1 (use -v to see invocation)

even if the output of gcc --version is

Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/c++/4.2.1
Apple LLVM version 10.0.0 (clang-1000.10.44.4)
Target: x86_64-apple-darwin18.2.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

and it works fine using -lc++

the issue seems to be with command line tools 10.1. If I roll back to 10.0 things are OK

@rattoma ok, thanks. When I have the time I will upgrade to 10.1 and take care of this. Thanks for pointing it out

assigned to @houtanb

@rattoma we will move to compliation via gcc and g++ (instead of clang) on macOS. The mex files already compile and run correctly when compiled against gcc-9 and g++-9. As soon as the preprocessor is moved to c++17 (sometime next week), the preprocessor will compile and run when compiled against g++-9.

To install the GNU compilers on macOS, you will need to run:

brew install gcc

To then configure dynare, you will need to run

CC=gcc-9 CXX=g++-9 ./configure --with-matlab=/Applications/MATLAB_R2019a.app MATLAB_VERSION=R2019a LDFLAGS="-L/usr/local/lib" --with-matio=/usr/local --with-gsl=/usr/local --with-slicot=/usr/local --disable-octave

I'll post here and close the issue once all of dynare compiles and runs with this configure statement on macOS

added macOS label

@houtanb many thanks for the new setup

mentioned in commit dynare@0d0a0a9b

@rattoma this should now be fixed and the above should work. Please tell me if you encounter a problem.

closed