I am working on a project that uses Adobe's DNG SDK 1.6 library, and it is supposed to work on Windows and MacOS.
The library has instructions on how to build it for both platforms, but I had to figure out an error that came up on Windows with Visual Studio. I am not very experienced with big C++ projects so it was not trivial but I got it working. Most of my own code will be done in C# .Net Core, calling the native libraries using a wrapper class with P/Invoke.
Now for Mac that's a different story, I have a MacOS 11 VM, installed Xcode 12.5.1 and followed the steps provided, as expected, it does not work. Bare in mind this is my first time touching Xcode and MacOS.
The project I am trying to build is dng_validate, and it depends on two libraries built by these projects: XMPFiles64 and XMPCore64.
The library projects build without any hiccups, each one of them creating a ".a" file in the folder: dng_sdk_1_6/xmp/toolkit/public/libraries/macintosh/intel_64_libcpp/Debug, they are named libXMPFilesStaticDebug.a and libXMPCoreStaticDebug.a respectively.
When I try to build the dng_validate project, I get the following error:
Library not found for -lXMPFilesStaticDebug
Because of the the error starting with an "l" instead of "lib", under both libraries project settings, I changed the "Executable Prefix" setting to "l" instead of "lib". Rebuilt both of them and made sure the file names changed as expected. But the error persists when trying to build the main project.
Under dng_validate's project settings, there is a setting called "Library Search Paths" and it does point to the proper aforementioned folder using a relative path. I even changed it to an absolute path to see if that would make it work.
I am really lost here, does anyone have an idea of what might be causing it?
Well... After asking on other forums and almost hiring a freelancer to fix this for me, I tried another shot in the dark of renaming the library files and it worked.
I changed the extensions of libXMPFilesStaticDebug.a and libXMPCoreStaticDebug.a from ".a" to ".dylib" and it just compiled and blew my mind with it.
Charls is an implementation of the JPEG-LS lossless and near-lossless coder/decoder. I downloaded the source code, built it in Xcode, and ran it on MacOS. From a few tests I ran, it seems to be reliable and very fast.
Now I want to incorporate charls into my application. I added the static library libcharls.a to my Xcode project and added the header file charls.h. When I try to do a build, I get the error: library not found for -lcharls. I then added a path to libcharls.a in the Library Search Paths of the Build Settings for the Project in Xcode. Still get the same error. Anyone have suggestions for getting this to build? TIA.
To answer my own question: adding the path to libcharls.a in Library Search Paths does fix the problem, but you only add the path, but not the file libcharls.a.
Recently I ran into a CMake problem that can be found in this thread:
Cmake on OSX Yosemite 10.10.3 - GLEW: package 'gl' not found
Eventually it got solved, maybe partly due to my inexperience in XCode and CMake. (I mainly used visual studio to compile projects in the past.)
After the alteration in the linked thread I got warning about my GLEW libs in CMake
(Is this something I should be worried about or is it not important?):
MACOSX_RPATH is not specified for the following targets:
GLEW_MX_shared
GLEW_shared
I simply ignored it and tried to compile my project in XCode with the ALL_BUILD target selected. In the sparky target it said the include files in main could not be found so I added the .h files into the inc folder of my project.
When I compiled again the compiler started complaining again
(I don't know what this error means and how I can fix it.):
ld: library not found for -llib
Googled it for the entire day now and I can't find anything to solve this issue.
It's so frustrating working with XCode as an IDE but I really want to learn more about different platforms and their most popular IDE's so I can make multi platform applications from the start instead of porting it afterwards.
And if it matters I am using OSX Yosemite 10.10.3.
To make my issue easier to understand, I've put a zip of my project on my dropbox.
https://www.dropbox.com/s/xnrh90kuih9ia5a/SPARKY%202.zip?dl=0
Feel free to ask questions if I explained things to briefly and again, thanks to everyone who contributes here. I really learned allot after discovering these forums.
EDIT: Alright I booted up my windows machine, generated a visual studio environment and tried to build it on there. Seems that the same problem also happens here. I looked at the linker attributes/flags and saw a lib.lib file added to the linking process which doesn't look right at all.
When removing the file, the error disappeared and many others arrived! (Which are simply solved by linking the appropriate libs so I wont handle those here.)
I misunderstood the error on my mac and thought it was referring to a random library which I needed to hunt down but actually it's a inconsistency in one of my CMake files.
EDIT2: Now I only have to find out where the lib.lib comes from and how I can ditch the flags from the project so I can generate my environment and build right away!
So moral of the story. Sometimes the solution is right in front of you and still ends up more like looking for a needle in a haystack.
I removed the following from my root CMakeLists.txt file and the random lib.lib library was gone from my generated projects
SET( PROJ_LIBRARIES "lib" )
I thought this added a folder containing libraries but actually what it did was adding another flag for a specific library because this variable was being fed to:
TARGET_LINK_LIBRARIES( ${PROJ_NAME} ${PROJ_LIBRARIES} ${OPENGL_LIBRARIES} ${GLEW_LIBRARIES} )
After installing the CocoaLumberjack' log compressor class I've been getting this annoying behavior: Xcode complains that there are many undeclared identifiers and gives me many errors (not warnings but errors with the red icon).
The thing is that I can compile and run my iPad app just fine but Xcode won't do any autocompletion. I tried cleaning the build folder (Product > option + Clean), and also deleting derived data. I've also rebooted to no avail.
As you can imagine this is a pain to work with. I did have this behavior happen before on a previous version of Xcode; it had something to do with stuff in my precompiled headers file but using the solution above would always fix it. I'm currently using Xcode 4.4 (4F250).
Sample error I'm getting:
Semantic Error: use of undeclared identifier 'DDTTYLogger'
The above happens even with classes that I wrote myself and that have not changed since installing the CocoaLumberjack compressor class.
I finally solved this after MANY attempts using the following:
Remove the last #import from my Prefix.pch and build again. Errors would happen (obviously). Put the line back and build again. No errors would show and after 10 seconds or so, errors would come back again.
Repeat the above except instead of the last #import, remove the last TWO imports, then three, four, etc. I did this until I removed five imports and when I put them back and waited, Xcode stopped complaining.
Note that this didn't occur to me at all. I read this solution on a blog somewhere.
Weird bug...
Open build settings and set "Precompile Prefix Header" to "No", that solved my problem.
Kudos for: https://stackoverflow.com/a/7035492/936957
I've been running into these issues constantly on all the latest versions of Xcode, in both Objective-C and Swift.
I noticed today that I was getting the errors in one particular class file. I removed it from some extra targets it was in and the errors finally went away!
I think Xcode has some fundamental bugs with it's handling of multiple targets right now. My theory is that if the other target is not built, you will essentially see errors from that target. Anyway hope this helps someone.
Not bad,
If you follow these Steps-
1-Clean Xcode(Cmd+Shif+K).
2- Clear Derived Data(Cmd+Shift+G).
Enter this path( ~/Library/Developer/Xcode/DerivedData/).
3- Quit and open again Xcode.
This problem can cause by setting "Target Membership" for some files are not the same.
Example:
A class XYZ put in file "a.swift" and it's used in file "b.swift". But "Target Membership" setting of "a.swift" is not the same "Target Membership" setting of b.swift.
Check "Target Membership" setting as below:
I was having issues with a library installed via cocoapods. Going to Build Settings and searching for 'Allow Non-modular Includes In Framework Modules' then setting it to Yes did the trick.
I had it on Xcode 10.1 when I accidentally pressed:
Cmd+Shift+U - ( build for Testing )
try Clean (Cmd+Shift+K) and then:
Cmd+Shift+R ( build for Running )
After update to Xcode 11, I met the same problem. I tried all the mentioned advices (cleaning folders, turning on/off different settings, restarting xCode), but nothing helped. Also, I have a big project in C, so, I'd like to keep using precompiled headers.
Finally I found that simple restart of Mac OS solves the problem! It's really weird behaviour, but I'm happy anyway that I found a solution – it's hard to code when lots of colourful error messages float around.
For me it helped cleanning the project. XCode->Product->Clean
I got the similar type of issue.
Alternate option to fix this is
Open organizer and delete the derived data of your project or delete all the projects in organizer projects tab. It works fine..
I just had the same thing in Xcode 5.1.
I fixed it by making sure there were no blank lines between #import's
I have removed some extra spaces and extra lines from .pch file and it xcode stopped complaining
This happened to me as well, but cleaning didn't fix it. What did was quitting and reopening XCode. Afterwards, all the phantom errors were gone. For those wondering, the tabs you have open when you close will still be open when you reopen.
I had this issue recently. It can be remedied in some cases by deleting the ModuleCache folder inside DerivedData, along with the project folder in DerivedData. Note that Xcode must be quit before doing this.
Running on Xcode Version 10.1 (10B61), I set the build setting "Increase Sharing of Precompiled Headers" to NO. I was working in an .xcworkspace with many projects sharing the same frameworks, and no Objective-C bridging header (meaning I've added no obj-c code myself). I'm not sure when Xcode did away with .pch files by default, but I didn't have any of those in my project.
Open up a terminal and create a nice little function accessible via the command line...
nano ~/.bashrc
add (making the necessary substitutions between the pointy braces)
cycle() {
git stash save "BACKUP"
git checkout <<SOME OTHER BRANCH>>
git branch -D $1
xcodebuild -allowProvisioningUpdates -workspace <<YOUR WORKSPACE>>.xcworkspace -scheme <<YOUR SCHEME>> -configuration Release clean
git checkout $1
}
^X and save it by following the prompts, then enter source ~/.bashrc to make it visible to the current terminal session.
Make sure your branch is pushed to origin, cause we're going to delete it :)
Call the function using cycle <<MY BRANCH>> (once it's run you might want to call git stash pop to restore any working copy changes)
Hope it works for you! Xcode, get on your game!
In my case (mixed objc/swift project) at least part of errors were caused by absence of imports for some used frameworks, e.g. "import UIKit". Project was compiled successfully because frameworks were anyway included in headers in Prefix.pch file. But errors were shown, for example about not finding method defined in UILabel extension, and yes, this extension was without "import UIKit". So I think these errors in most cases depends on Prefix.pch precompilation/updating.
Touching Prefix.pch, cleaning, removing derived data, closing/opening XCode sometimes helps, but not always.
Using SPM, it can be that the Module you import, which you use at the location of the errors, has missing dependencies itself.
In my case I had an error about a missing initializer, XCode trying to use a different one than the one already defined in the other Module. But the project compiled fine! Nothing worked at first. Then I tried first cleaning, and then Product -> Perform Action -> Compile "myfile.swift" and it showed what the missing dependency in the dependency was! Note: This goes recursive. In multiple places a depenendency may have not been declared in the package.swift -> compile the same file repeatedly until it compiles successfully.
So.. it wasn't that the module with the error had a missing dependency, but rather that the direct dependency did miss a Module-dependency declaration in its package.swift declaration.
My explanation is that to generate the Error-output of XCode, Modules get compiled alone on their own. Import errors then show up. But when Modules are built as part of a larger Module, then that large module may import the missing dependency of the broken sub-Module already, making the build pass.
While trying to get the template Xcode 4 ogre project to work, the build fails because it can't find OgreCamera.h.
I've installed Ogre to /opt/local/lib/OGRE, and specified that as the Ogre SDK location when creating the Xcode 4 project.
Needless to say, the header and framework include paths in the project settings point exactly to where all the header files are, yet not one of them can be found. I've tried commenting out the include of OgreCamera.h, and upon trying to run, the next include, OgreEntity.h, cannot be found. Commenting that out and running again, the next include can't be found, and so on (these includes are in OgreFramework.h.
I don't understand why these headers, which clearly exist when I go look for them in the Finder or Terminal, can't be found by the project, even when I specify their full path like this:
#include </opt/local/lib/OGRE/lib/release/Ogre.framework/Versions/1.7.4/Headers/OgreCamera.h>
Did I somehow install the Ogre SDK incorrectly? (I copied it from the DMG into place…)
I had the same problem, and found partial success by following rjstelling's answer from this thread:
why can't Xcode find this header file?
That solved the OgreCamera.h include issues, but now I'm stuck on including the boost libraries. They are not picked up on the search paths, or in the Indexing group as suggested in the thread above.
Basically it looks like a bug in XCode4 that has to be worked around until a patch is released. There is also more information here:
Compile, Build or Archive problems with Xcode 4 (and dependencies)