I have both installed, no idea which is used for compiling widelands :-D
$:> pacman -Qs gcc
local/gcc 8.2.1+20180831-1 (base-devel)
The GNU Compiler Collection - C and C++ frontends
$:> pacman -Qs clang
local/clang 7.0.0-1
C language family frontend for LLVM
Other packages maybe related on my system:
local/freeglut 3.0.0-2
Provides functionality for small OpenGL programs
local/glew 2.1.0-1
The OpenGL Extension Wrangler Library
local/glibmm 2.56.0-1
C++ bindings for GLib
local/glu 9.0.0-5
Mesa OpenGL Utility library
local/libglvnd 1.1.0-1
The GL Vendor-Neutral Dispatch library
local/mesa 18.2.2-1
An open-source implementation of the OpenGL specification
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