# Link Error iOS arm64 \_FMOD5\_System\_GetCPUUsageEx FMOD 2.01.04

**URL:** <https://qa.fmod.com/t/link-error-ios-arm64-fmod5-system-getcpuusageex-fmod-2-01-04/16190>\
**Category:** Unity\
**Tags:** ios, unity\
**Created:** [September 18, 2020, 4:24am UTC](https://qa.fmod.com/t/link-error-ios-arm64-fmod5-system-getcpuusageex-fmod-2-01-04/16190 "2020-09-18T04:24:08Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![burnum](https://avatars.discourse-cdn.com/v4/letter/b/f4b2a3/32.png) [@burnum](https://qa.fmod.com/u/burnum)\
**Post date:** [September 18, 2020, 4:24am UTC](https://qa.fmod.com/t/link-error-ios-arm64-fmod5-system-getcpuusageex-fmod-2-01-04/16190/1 "2020-09-18T04:24:08Z")

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When building for iOS, I get this error with FMOD 2.01.04:

▸ Linking UnityFramework  
❌ Undefined symbols for architecture arm64  
\> Symbol: \_FMOD5\_System\_GetCPUUsageEx  
\> Referenced from: \_System\_getCPUUsageEx\_m4EA60B358E99BCA5B44B20CEA000250509A39CB6\_AdjustorThunk in Assembly-CSharp-firstpass1.o  
❌ ld: symbol(s) not found for architecture arm64  
❌ clang: error: linker command failed with exit code 1 (use -v to see invocation)

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**Author:** ![SopliBomja](https://avatars.discourse-cdn.com/v4/letter/s/c5a1d2/32.png) [@SopliBomja](https://qa.fmod.com/u/SopliBomja)\
**Post date:** [September 20, 2020, 7:49am UTC](https://qa.fmod.com/t/link-error-ios-arm64-fmod5-system-getcpuusageex-fmod-2-01-04/16190/2 "2020-09-20T07:49:49Z")

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Same problem

> arm64 function not 4-byte aligned: \_unwind\_tester from …/Libraries/libiPhone-lib.a(unwind\_test\_arm64.o)  
> Undefined symbols for architecture arm64:  
> “\_FMOD5\_System\_GetCPUUsageEx”

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<div class="post-metadata">

**Author:** ![mathew](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/mathew/32/431_2.png) [@mathew](https://qa.fmod.com/u/mathew)\
**Post date:** [September 21, 2020, 6:04am UTC](https://qa.fmod.com/t/link-error-ios-arm64-fmod5-system-getcpuusageex-fmod-2-01-04/16190/3 "2020-09-21T06:04:10Z")

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Thanks for the report, it looks like this is the same issue affecting our Switch build, please try the workaround discussed in that thread: [Nintendo Switch linker error on build](https://qa.fmod.com/t/nintendo-switch-linker-error-on-build/16183)

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<div class="post-metadata">

**Author:** ![burnum](https://avatars.discourse-cdn.com/v4/letter/b/f4b2a3/32.png) [@burnum](https://qa.fmod.com/u/burnum)\
**Post date:** [September 21, 2020, 10:25pm UTC](https://qa.fmod.com/t/link-error-ios-arm64-fmod5-system-getcpuusageex-fmod-2-01-04/16190/4 "2020-09-21T22:25:58Z")

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Thanks, commenting out lines 1205-1208 and lines 1555-1556 of fmod.cs worked for me as well.