Why am I seeing a compilation error about -falign-loops using LLVM?

0
votes

I have an iOS application that uses Core Plot, and after I upgraded to Xcode 4.5, I'm seeing the following error when building:

clang: error: argument unused during compilation:
'-falign-loops=16' Command
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/u‌​sr/bin/clang
failed with exit code 1

What can cause this and how can I fix it?

2
iosiphoneobjective-cclangcore-plot
You don't have any more information? - DrummerB
clang: error: argument unused during compilation: '-falign-loops=16'Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang failed with exit code 1 - Pradeep Singhvi
Is this with the latest Core Plot code from the repository, or the older 1.0 snapshot? The 1.0 snapshot will no longer build properly under Xcode 4.4+, so you need to update to the latest framework code from the Google Code repository. - Brad Larson♦

2 Answers

2
votes

-falign-loops is a GCC option not used by clang. It is normally a warning in clang, so I assume you have the compiler option set to treat warnings as errors (-Werror).

1
votes

I had the same issue using CorePlot, the following solved the problem

  • Go to CorePlot-CocoaTouch Project
  • Build Settings
  • Scroll down to Build Options
  • Compiler for C/C++/Objective-C set its value to LLVM GCC 4.2

Hope it resolves your issue