Clang error linker command failed with exit code 1 use v to see invocation

You missed the definition of function int power (int base, int n) which is given after your main ends on the next page of the book.

When you declare prototype of a function you need to define what it should do you just declared the power function and never defined that, that’s why you got error.

Include the following definition, your code will compile the way you wants it to be.

int power (int base, int n) {
    int i, p;
    p = 1;
    for (i=1; i<=n; ++i)
        p = p*base;
    return p;
}

Pre-edit answer

Now this is not relevant, but useful

I think you want to use function pow() defined in math.h.

double pow(double a, double b)

The C library function pow(double a, double b) returns a raised to the power of b. This function returns a double value so to print that correct specifier will be "%lf".

In this case you just need to include header file

#include <math.h>

In your program.

There is no need to give function declaration int power(int m, int n);

The error you are having is due to giveing I as on of the parameter to pow()
because when you will compile your code (after including math.h and using pow() replacing i with any integer numbers will compile your code and will give proper output.

printf("%lf %lf %lfn", i, pow(2, 3), pow(3, 2));

This will give you proper result but when you compile it with

for (i=0; i<10; ++i) {
    printf("%lf %lf %lfn", i, pow(2, i), pow(-3, i));
}

It throws same error so I think pow() takes only constants as input so it won’t run in for loop.

And if you don’t want to include math.h you can simply declare

extern double pow (double base, double exponent);

That will link correctly with the library code without using the math.h include file, here is an example.

int main() {
    extern double pow (double base, double exponent);
    printf("%lf", pow(8.0, 8.0));
    return 0;
}

For more on pow() you can check man page on Linux i.e. man pow.

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Just updated to the latest XCode. Big mistake. Why must Apple ruin my project everytime they update Xcode? I might give up on Swift development if I can’t get this fixed easily.

The error I get is: clang: error: linker command failed with exit code 1 (use -v to see invocation)

How should I go about fixing it? Already tried build clean and restarted XCode a bunch.

That message isn’t the error, it’s just a message telling you there is an error.

Go to the build log (click the last icon across the top of the navigator pane), expand the transcript with the error, and if necessary click the details icon to see the error message(s) produced by the linker.

Here is the error:

Ld /Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Products/Debug-iphonesimulator/name.app/PlugIns/nameTest.xctest/nameTests normal x86_64

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -bundle -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.0.sdk -L/Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Products/Debug-iphonesimulator -F/Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Products/Debug-iphonesimulator -F/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Frameworks -filelist /Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Intermediates/appName.build/Debug-iphonesimulator/appNameTests.build/Objects-normal/x86_64/appNameTests.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -Xlinker -rpath -Xlinker @loader_path/Frameworks -mios-simulator-version-min=9.1 -bundle_loader /Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Products/Debug-iphonesimulator/appName.app/appName -Xlinker -object_path_lto -Xlinker /Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Intermediates/appName.build/Debug-iphonesimulator/appNameTests.build/Objects-normal/x86_64/appNameTests_lto.o -Xlinker -export_dynamic -Xlinker -no_deduplicate -Xlinker -objc_abi_version -Xlinker 2 -fobjc-link-runtime -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphonesimulator -Xlinker -add_ast_path -Xlinker /Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Intermediates/appName.build/Debug-iphonesimulator/appNameTests.build/Objects-normal/x86_64/appNameTests.swiftmodule -lsqlite3 -framework XCTest -Xlinker -dependency_info -Xlinker /Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Intermediates/appName.build/Debug-iphonesimulator/appNameTests.build/Objects-normal/x86_64/appNameTests_dependency_info.dat -o /Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Products/Debug-iphonesimulator/appName.app/PlugIns/appNameTests.xctest/appNameTests

ld: /Users/name/Library/Developer/Xcode/DerivedData/appName-gwipifpkqxuqdbeopzfzxqnhkamn/Build/Intermediates/appName.build/Debug-iphonesimulator/appNameTests.build/Objects-normal/x86_64/appNameTests.o compiled with newer version of Swift language (3.0) than previous files (2.0) for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

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Linker command failed with exit code 1 (use -v to see invocation) #297

Hello — I searched the issues here as well as in stackOverflow, but cannot seem to find a resolution to this problem.

I followed the manual instructions — https://github.com/mapbox/react-native-mapbox-gl/blob/master/ios/install.md — to install react-native-mapbox-gl for iOS, installing manually onto my Macbook Pro and I am using_ xCode 7.2.x_ .

I am getting an error in xCode and the project fails to build with the following error :

xCode is executing the following command:

general details —
*running react-native 0.2x (latest)
*used node 4.x stable to install react-native-mapbox-gl via npm
*Also changed the deployment target from iOS 7.x to 8.x and 9.x in xCode and still get the same results.

initial thought — do I have to add some file or folder to path? let me know.

Any help is appreciated. thanks — Edward

The text was updated successfully, but these errors were encountered:

Any chance you could post a screenshot of your Xcode setup? Can you verify you added the Mapbox framework in the embedded framework section?

@bsudekum thanks for responding. I will post a screenshot of xCode setup in a moment but yes I embedded the Mapbox framework in the embedded framework settings under the General Tab for my project.

In the meantime, I thought I would follow up with the following:

1. looks like the process for creating Android version works (I was able to implement the example)
2. I also attempted the cocoapods install. Got a similar linker error —

ld: library not found for -lPods- clang: error: linker command failed with exit code 1 (use -v to see invocation)

(even going further as to add the additional references to my podfile as you described further on in the iOS instructions and updating the node_modules references appropriately, this executed with no errors)
`
source ‘https://github.com/CocoaPods/Specs.git’

xcodeproj ‘projectName’
workspace ‘projectName’

pod ‘RCTMapboxGL’, :path => ‘../node_modules/react-native-mapbox-gl/ios’
pod ‘React’, :path => ‘../node_modules/react-native’
pod ‘React/RCTGeolocation’, :path => ‘../node_modules/react-native’
pod ‘React/RCTImage’, :path => ‘../node_modules/react-native’
pod ‘React/RCTNetwork’, :path => ‘../node_modules/react-native’
pod ‘React/RCTText’, :path => ‘../node_modules/react-native’
pod ‘React/RCTWebSocket’, :path => ‘../node_modules/react-native’
`

So having tried both methods on two mac machines I am currently stuck.

Here is the general order of steps I performed in image form as per your request @bsudekum

1. install at command prompt
   
2. add to project
   
3. embed in general tab
   
4. add run script in build phase
   
5. add framework/library
   
6. result of adding framework/library
   

I then implemented the example and built the project in Xcode.

Here was the result (from one of a number of multiple tests) @bsudekum .

specs:
*xCode 7.2.1
*simulator was set up as iphone5 / iOS 8.1,9.1,9.2 or iPhone 6s iOS 8.1,9.1,9.2
*fresh install for examples: npm / nvm, node 4.x, react-native 0.20 (they have since upgraded to 0.21)
*I am the admin of my machine with root access (if required)

I also ran the setup against cocoa pods (latest version) and had the native version of Ruby for OSX (I think 2.x) then upgraded to the latest version for OSX.

_notes: in a test I performed today (March 7th, over a week later) I was able to get the example iOS app running by launching the site from the _terminal* using the command react-native run-ios . but not in xCode on two different machines??
** I also noted that the manual instructions for iOS do not necessarily match the images provided , had to infer whether to add «bash» to the run script command for example, or when you right-click on your project to add files, do you add the RCTMapbox.xpcodeproj to the root of your project or in the libraries folder? — The choice you make determines whether xCode finds Mapbox.framework easily or not when you embed it in the general tab and it may be the cause of some issues (xCode might not find it on building the project and the icon indicates its ‘missing’)

I’m getting the same issue. Been following the guide for adding to Xcode manually, but getting the
framework not found Mapbox when trying to build the application.

My problem was that I initially did one of the steps wrong (added a library to the wrong path), and no matter if I fixed it it was broken.
Had to recreate the whole project, then it worked fine.

@frankbolviken so even just removing and re-adding the correct library and its path did not work for you? re-creating the entire project? strange, I will try.

@edward-at-intelex did you solve this problem?

I am experiencing the same issue. I have followed the guide exactly but still receive the error

I added following entry to Build Settings -> Framework Search Paths (Debug and Release) and it solved the problem on my machine:
$(PROJECT_DIR)/../node_modules/react-native-mapbox-gl (recursive)

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clang: error: linker command failed with exit code 1 (use -v to see invocation) #2997

When I want to complier the PCL project, there are kinds of errors, for example:
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [untitled] Error 1
make[2]: *** [CMakeFiles/untitled.dir/all] Error 2
make[1]: *** [CMakeFiles/untitled.dir/rule] Error 2
make: *** [untitled] Error 2
I have tried many ways except for reinstalling my system, but I failed, and there are no much similar situation. macOS 10.13 has not such problems.

I want to know if these problems are leaded by macOS10.14? Have any way to solve them? Thank you so much!

The text was updated successfully, but these errors were encountered:

I don’t think we will be able to help you with just this information. The error log just tells us you have a linking error. I’m still on High Sierra but we had Mojave users reporting successful compilation before.

Is it just version 1.9.1 that you’re not able to compile or also the current master branch?

I installed CMake and PCL through homebrew, I think that everything is up to date. I tried from December of last year and started from the newest PCL version, but there were always kinds of errors, including the cmake error about not finding glew.
Could you tell me about the installation process of the Mojave users who successful compilation, please?

I installed CMake and PCL through homebrew, I think that everything is up to date.

So it means that you’re not trying to compile PCL, but your own project which uses PCL. That wasn’t clear. If that’s the case and you’re having linking problems can you post the CMakeLists.txt file for your project?

I tried from December of last year and started from the newest PCL version, but there were always kinds of errors, including the cmake error about not finding glew.
Could you tell me about the installation process of the Mojave users who successful compilation, please?

I can’t help you with this. I’ve seen reports about that glew problem, but at this point migrating to Mojave is not an option for me and our CI infrastructure is still on High Sierra. However, it seems Mojave was deployed just last month to Azure Pipelines so we can upgrade it, see what happens and hopefully bump into whatever problem there might exist.

Your soonest response will be highly appreciated. Yes, I have not tried to compile PCL, just my own project uses PCL. I also think that you can have a try and to see what will happen after upgrade.

This is the CMakeLists.txt of my project:

cmake_minimum_required(VERSION 3.13)
project(T191_2)

add_executable(T191_2 main.cpp)
target_link_libraries(T191_2 $)

Try removing the following lines

I tried, but still the error.

And I compiled PCL1.9.1 with CMake just, there`s no problems.

Are you by chance getting the error ld: library not found for -lflann as well?

Are you by chance getting the error ld: library not found for -lflann as well?

That particular bug should be fixed already, although it wan’t released yet. Try to compile the current master and give it a try.

你偶然得到错误 ld: library not found for -lflann 吗？

Yes, sometimes. I have solved now, though it is not perfect. I install PCL1.8.1 first through homebrew, then new a project through CLion with C++ Standard 11. Then upgrade the PCL, succeed. But this way can not new a project again, because it will have the glew error in new projects.

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