I'm compiling an old version of OGRE ON CMake 3.6 to see if I can compile or revive an old piece of software, and Boost is one of the dependencies for OGRE. It's essentially for multi-threading and without it, OGRE 1.9.0 builds completely fine on the macOS 12.0 SDK but fails macOS 10.8 SDK (specified in ZSH as -DCMAKE_OSX_DEPLOYMENT_TARGET but that's another issue for later).
The CMake command: cmake -DOGRE_CONFIG_DOUBLE=ON -DOGRE_BUILD_SAMPLES=OFF -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_ARCHITECTURES="x86_64" -DCMAKE_PREFIX_PATH=/usr/local (yes, I'm compiling x86_64 on a arm64 machine running macOS 12.1 & XCode 13.1 if it matters)
When I build OGRE on the 12.0 SDK with Boost support (all is found here), it successfully checks for all libraries. As a note, Boost also has the atomic library but it's only needed as .hpp files and not an actual .a or whatever-lib file format CPP uses. Compiling OGRE goes all well until I see this dreaded message:
Copying OS X content lib/macosx/Ogre.framework/Versions/1.9.0/Resources/ogrelogo.png
28 warnings generated.
21 warnings generated.
[ 44%] Linking CXX shared library ../lib/macosx/Ogre.framework/Ogre
> ld: library not found for -latomic <
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Key questions: What is this atomic library? Is it only on an older SDK? Is it the hpp files? Here is the linker command shortened to where I think is the most important parts
cd /Users/meh/Downloads/project/ogre-1-9-0/OgreMain && /Applications/CMake.app/Contents/bin/cmake -E cmake_link_script CMakeFiles/OgreMain.dir/link.txt --verbose=1
/usr/bin/clang++ -msse -stdlib=libc++ -std=c++11 -Wall -Winit-self -Wno-overloaded-virtual -Wcast-qual -Wwrite-strings -Wextra -Wno-unused-parameter -Wshadow -Wno-missing-field-initializers -Wno-long-long -O3 -DNDEBUG -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk -dynamiclib -Wl,-headerpad_max_install_names -framework AGL -framework IOKit -framework Cocoa -framework Carbon -framework OpenGL -framework CoreVideo -compatibility_version 1.9.0 -current_version 1.9.0 -o ../lib/macosx/Ogre.framework/Versions/1.9.0/Ogre -install_name @executable_path/../Frameworks/Ogre.framework/Versions/1.9.0/Ogre (ALL THOSE OGRE .O FILES) -L/usr/local/lib /usr/local/lib/libboost_thread.a /usr/local/lib/libboost_date_time.a /usr/local/lib/libboost_system.a /usr/local/lib/libboost_chrono.a /usr/local/lib/Release/libFreeImage.a /usr/local/lib/Release/libzziplib.a /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.0.sdk/usr/lib/libz.tbd -latomic
I had to play around with the CMake file to not error listed as:
framework AGL-stdlib=libc++ -std=c++11
I've done research and atomic shows up in C++11 so that shouldn't be a problem? There's some include files under the SDK but definitely none under /usr/local/lib... (I will have to add -L/usr/local/include as a prefix to -latomic later)
