Arch Linux

Description:
When I'm upgrading mingw-w64-gcc from 4.9.2-2 to 5.1.0-1, I encounter the following error:
$ sudo pacman -S mingw-w64-gcc
resolving dependencies...
looking for conflicting packages...

Packages (1) mingw-w64-gcc-5.1.0-1

Total Installed Size: 538.01 MiB
Net Upgrade Size: 83.08 MiB

:: Proceed with installation? [Y/n]
(1/1) checking keys in keyring [########################################] 100%
(1/1) checking package integrity [########################################] 100%
(1/1) loading package files [########################################] 100%
(1/1) checking for file conflicts [########################################] 100%
error: failed to commit transaction (conflicting files)
mingw-w64-gcc: /usr/lib/libcc1.so exists in filesystem
mingw-w64-gcc: /usr/lib/libcc1.so.0 exists in filesystem
mingw-w64-gcc: /usr/lib/libcc1.so.0.0.0 exists in filesystem
Errors occurred, no packages were upgraded.

Additional info:
$ pacman -Qo /usr/lib/libcc1.so /usr/lib/libcc1.so.0 /usr/lib/libcc1.so.0.0.0
/usr/lib/libcc1.so is owned by gcc-multilib 5.1.0-1
/usr/lib/libcc1.so.0 is owned by gcc-multilib 5.1.0-1
/usr/lib/libcc1.so.0.0.0 is owned by gcc-multilib 5.1.0-1

Steps to reproduce:
Clearly described above