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All fixed.

Doesn't compile for me. Fails with:

configure:3602: error: in `/tmp/yaourt-tmp-karel/aur-gcc47/src/x86_64-unknown-linux-gnu/libgcc':

configure:3605: error: cannot compute suffix of object files: cannot compile

Last few errors in config.log:

xgcc: error: unrecognized command line option '-V'

xgcc: error: unrecognized command line option '-qversion'

xgcc: error: unrecognized command line option '-fno-plt'

xgcc: error: unrecognized command line option '-fno-plt'

Tried to compile with make -j2 CC=gcc-6 and just make -j2.

Full config.log: https://pastebin.com/YD4gmN4h

It looks like package is finally broken. Compilation fails with message "configure: error: cannot compute suffix of object files: cannot compile", and there is nothing interesting in internal log.

For those, who needs gcc47 for Matlab I can only offer a dirty workaround. I still have half-working package, which was built a year ago. You can download it from here (but you better fix the package, using unsigned packages is a bad thing):
https://ftp.vtyulb.ru/gcc47-4.7.4-2-x86_64.pkg.tar.xz
After installation of package you'll need to run:
sudo ln -s /usr/lib/libisl.so /usr/lib/libisl.so.10 && sudo ldconfig

Compiler works after the hack, but I can't check if it's usable by Matlab, because I don't have one. Good luck!

joaocandre, can you send me logs to <vtyulb@vtyulb.ru> ?

I get a lot of undefined references when linking, can't install.

For me, the package compiles and installs fine with no bug or special edit of PKGBUILD.

After installation, the gcc4.7 works well with Matlab/Simulink in accelerator mode just by following instructions on the Archlinux's wiki page about Matlab. I had to change folders in Simulink preferences in order to have the same folder (/tmp for me) for both "Simulation cache folder" and "code generation folder".

Tanks to the maintainer !

Fixed errors. You can build it now, or download fresh version from me (not recommended and not safe):
https://ftp.vtyulb.ru/gcc47-4.7.4-2-x86_64.pkg.tar.xz

I'm trying to fix it now. I compiled latest version 24th of July, can give you that packet if you want.

I followed the instructions of stonyboy but the compilation failed on my computer. It's a pity because this package would be still useful for Matlab users (gcc47 is an optional dependence even for recent versions).