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Instruct macos users to use avr-gcc@7 (#3337)

Browse Source 
If you run `brew install avr-gcc`, you get a version that has
compatibility issues with LUFA. I updated the getting started guide for
osx, the qmk_install setup script, and added a section to the FAQ for
folks like me who accidentally updated avr-gcc past 7.
This commit is contained in:
Evan Travers 2018-07-07 20:37:37 -04:00 committed by Drashna Jaelre
parent 978fa700d8
commit 0d5a8b048a
3 changed files with 16 additions and 2 deletions
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14
docs/faq_build.md
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@ -104,3 +104,17 @@ brew install dfu-programmer
brew install gcc-arm-none-eabi
brew install avrdude
```
### avr-gcc 8.1 and LUFA
If you updated your avr-gcc to above 7 you may see errors involving LUFA. For example:
`lib/lufa/LUFA/Drivers/USB/Class/Device/AudioClassDevice.h:380:5: error: 'const' attribute on function returning 'void'`
For now, you need to rollback avr-gcc to 7 in brew.
```
brew uninstall --force avr-gcc
brew install avr-gcc@7
brew link avr-gcc@7
```

2
docs/getting_started_build_tools.md
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@ -56,7 +56,7 @@ If you're using [homebrew,](http://brew.sh/) you can use the following commands:
brew tap osx-cross/avr
brew tap PX4/homebrew-px4
brew update
brew install avr-gcc
brew install avr-gcc@7
brew install dfu-programmer
brew install gcc-arm-none-eabi
brew install avrdude

2
util/macos_install.sh
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@ -22,4 +22,4 @@ fi
brew tap osx-cross/avr
brew tap PX4/homebrew-px4
brew update
brew install avr-gcc gcc-arm-none-eabi dfu-programmer avrdude
brew install avr-gcc@7 gcc-arm-none-eabi dfu-programmer avrdude