make.conf

# This file is used by Portage to customise your packages.
# Check the manual page for make.conf or the gentoo wiki for more flags.

# These flags are used by your PC's C, C++, and Fortran compilers.
# In this file, all these compilers will use the same flags.
# --march=native will compile all packages for your PC's architecture, 
#    ensuring nothing is ever cross-compiled.
# -O2 means our compiler will try and optimise code during compilation.
#    It's not recommended to go to -O3 for all packages, so we'll go
#    with the -O2.
# -pipe dictates how different stages of compilation communicate.
#    -pipe means use pipes instead of temporary files.
COMMON_FLAGS="-march=native -O2 -pipe"
CFLAGS="${COMMON_FLAGS}"
CXXFLAGS="${COMMON_FLAGS}"
FCFLAGS="${COMMON_FLAGS}"
FFLAGS="${COMMON_FLAGS}"

# Defines additional software licenses for us to use.
# I am trying to use more FOSS software, so I only want to packages that Gentoo considers free software.
# The '-*' means 'only use the following licenses'
# Even if this causes problems, I can add exceptions for problematic packages.
ACCEPT_LICENSE="-* @FREE"

# Recent packages are on 'testing' branches. This variable sets the testing branch we'll use for packages.
ACCEPT_KEYWORDS="~amd64"

# Changes Portage's default behaviour
# * fail-clean: Clean temporary directories after a build failure
FEATURES="fail-clean"

# Stores where ebuild logs are kept.
PORTAGE_LOGDIR="/var/log/ebuild-logs"

# MAKEOPTS determines how many parallel compilations should occur when
# installing a package. It's usually not worth making this higher than the
# number of available CPUs.
# For example, I am using an AMD 7950X, which has 16 cores and 2 threads per core, for a toral of 32 available processes.
# -j is the number of processes to run in parallel.
# -l is the maximum allowed load average, which should be about j*0.9
MAKEOPTS="-j32 -l28.8"
# Similar story with this one
EMERGE_DEFAULT_OPTS="${EMERGE_DEFAULT_OPTS} --jobs=32 --load-average=28.8"

# This is used to tell Portage what graphics card you are using (if any).
# Your choices are:
# * 'amdgpu radeonsi' for newer open-source amd drivers
# * 'intel' for intel graphics drivers
# * 'nouveau' for the open-source nvidia drivers
# * 'nvidia' for the proprietary nvidia drivers
# * 'radeon radeonsi' for older open-source amd drivers
VIDEO_CARDS="amdgpu radeonsi"

# This is used to tell Portage what we use to control our PC.
# libinput is for mice and keyboards.
INPUT_DEVICES="libinput"

# Tells the system which version of GRUB to install.
GRUB_PLATFORMS="efi-64"

# Sets the language of the build output to English
LC_MESSAGES=C

# Portage uses the USE variable to determine the default way to build
# a package. You can add/remove flags using the USE variable in this file.
# NOTE: This does not overwrite the value of USE that Portage uses, it only
# appends to it! It also applies to ALL packages you build, so only
# put a flag here if you want it to apply system-wide!
#  alsa:       Add support for the advanced linux sound architecture.
#  elogind:    Build packages that normally require logind from systemd.
#  examples:   Download code examples where applicable.
#  ffmpeg:     Enable certain kinds of audio/video codec support.
#  ipv6 :      Add support for ipv6.
#  multilib:   Allow compilation of 32-bit binaries.
#  opengl:     Add support for openGL graphics.
#  pulseaudio: Add support for PulseAudio.
#  xinerama:   Add support for querying multi-monitor screen geometry.
#  udev:       Enable virtual/udev integration.
#  vulkan:     Build in Vulkan driver support.
#  wayland:    Add support for Wayland.
#  X:          Add support for X11.
#  -emacs:     Don't add support for emacs.
#  -gnome:     Don't add GNOME support.
#  -kde:       Don't use KDE software.
#  -systemd:   Don't use systemd-specific libraries.
#  -wifi:      Don't enable wifi functionality.
USE="alsa elogind examples ffmpeg ipv6 multilib opengl pulseaudio udev vulkan xinerama wayland X -emacs -gnome -kde -systemd -wifi"