#This file contains the optimization defaults that GentooLTO uses
#More will be added in the future.
#Sourcing this file will enable you to transparently receive these new settings
#without intervention.  If this is not desirable, see the file make.conf.lto.defines for custom configurations.

#To use this file, first define NTHREADS to the number of threads you want the LTO
#processes to use on your system at the top of your make.conf:

#NTHREADS="12" 

#A good number is the number of hardware threads you have available on your system.
#You may also set this to "auto" to have gcc determine optimal number of cores (GCC 10+) 
#After this, but before any other variables are defined, source this file directly:

#source /etc/portage/make.conf.lto

#Then, afterwards, define your CFLAGS with your own options:

#CFLAGS="-march=native ${CFLAGS} -pipe"

#This enables your CFLAGS to inherit the default flags that GentooLTO uses.
#Note that you may want to enable -falign-functions=32 if you use an Intel processor (Sandy Bridge or later).
#See issue #164 for details.

#Next, set your CXXFLAGS to CFLAGS:

#CXXFLAGS="${CFLAGS}"

#Your CXXFLAGS should be a superset of your CFLAGS.  Most people will never need to add anything extra to their CXXFLAGS.

#Your LDFLAGS should contain *ALL* of your CFLAGS for LTO to work.  It must receieve all optimization options, march, etc.
#Fortunately, package.cflags takes care of this for you--no need to manually add your {C,CXX}FLAGS here or anywhere else.
#If you modify LDFLAGS, ensure that your profile's LDFLAGS are respected by including them first:

#LDFLAGS="${LDFLAGS} -Wl,--your-modifications=here"

#NOTE: your profile likely contains -Wl,--as-needed and -Wl,-O1.
#The -Wl,-01 here is a separate option sent to the linker that optimizes shared object binary sizes
#It is NOT related to the -O option given to gcc and has no bearing on that option.
#For example, compiling using: -fuse-linker-plugin -flto -O3 -Wl,-O1:
#This will produce an LTO binary with -O3
#level optimization and also pass -O1 to the linker to reduce the shared object size.

#!!!Consider also using cpuid2cpuflags to set your CPU_FLAGS_* variable in your make.conf for packages that rely on explicit optimizations such as intrinsics!!!

#Some quality of life things:

#You may want to lower Portage's niceness level, seeing as your emerges will take longer.
#The effectiveness of this depends on what CPU scheduler you use.

#PORTAGE_NICENESS=15

#LTO takes a lot more memory than non-LTO processes.  You will likely not be able to emerge many packages
#in parallel unless you have a lot of memory available.  As an alternative, consider setting MAKEOPTS
#to parallelize according to NTHREADS, which should avoid that problem.  You may consider balancing between
#emerging in parallel with parallizing make as a compromise.

#MAKEOPTS="-j${NTHREADS}"

#Lastly, for cmake packages, you may want to set the default generator to Ninja.
#It is considerably faster than GNU make and can help build times.

#CMAKE_MAKEFILE_GENERATOR=ninja

#Only one package, kde-plasma/kinfocenter, needs CMAKE_MAKEFILE_GENERATOR=emake.  It can be overridden
#in your own package.cflags/kinfocenter.conf file like so:

#kde-plasma/kinfocenter CMAKE_MAKEFILE_GENERATOR=emake

#This concludes setup for GentooLTO using the default settings.
#If you want to cherry pick these settings, source make.conf.lto.defines directly
#and read the comments in that file.

source /etc/portage/make.conf.lto.defines

#Thanks to issue #49, no action necessary for preventing stripping of static libraries

CFLAGS="-O3 ${GRAPHITE} ${DEVIRTLTO} ${IPAPTA} ${SEMINTERPOS} ${FLTO} -fuse-linker-plugin"