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Overhaul the MACHINE_CPU behaviour:
* Rip out MACHINE_CPU stuff from sys.mk and include a new <bsd.cpu.mk>
after we pull in /etc/make.conf. We need to do it afterwards so we can
react to the user setting of the:
* CPUTYPE variable, which contains the CPU type which the user wants to
optimize for. For example, if you want your binaries to only run on an
i686-class machine (or higher), set this to i686. If you want to support
running binaries on a variety of CPU generations, set this to the lowest
common denominator. Supported values are listed in make.conf.
* bsd.cpu.mk does the expansion of CPUTYPE into MACHINE_CPU using the
(hopefully) correct unordered list of CPU types which should be used on
that CPU. For example, an AMD k6 CPU wants any of the following:
k6 k5 i586 i486 i386
This is still an unordered list so the client makefile logic is simple -
client makefiles need to test for the various elements of the set in
decreasing order of priority using ${MACHINE_CPU:M<foo>}, as before.
The various MACHINE_CPU lists are believed to be correct, but should be
checked.
* If NO_CPU_CFLAGS is not defined, add relevant gcc compiler optimization
settings by default (e.g. -karch=k6 for CPUTYPE=k6, etc). Release
builders and developers of third-party software need to make sure not to
enable CPU-specific optimization when generating code intended to be
portable. We probably need to move to an /etc/world.conf to allow the
optimization stuff to be applied separately to world/kernel and external
compilations, but it's not any worse a problem than it was before.
* Add coverage for the ia64/itanium MACHINE_ARCH/CPUTYPE.
* Add CPUTYPE support for all of the CPU types supported by FreeBSD and gcc
(only i386, alpha and ia64 first, since those are the minimally-working
ports. Other architecture porters, please feel free to add the relevant
gunk for your platform).
Reviewed by: jhb, obrien
This commit is contained in:
Kris Kennaway
parent
afbf465152
commit
62d90fb793
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=72878
@ -13,18 +13,20 @@
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# You have to find the things you can put here in the Makefiles and
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# documentation of the source tree.
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#
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#
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# MACHINE_CPU controls which processor-specific optimizations will be
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# used by certain components of FreeBSD (currently only OpenSSL).
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# This should be set to a list of your CPU type, plus all previous
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# generations of the CPU architecture. The reason for using a list is
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# because not all programs which use the MACHINE_CPU variable may have
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# optimizations for your specific CPU generation (e.g. Pentium Pro),
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# but may have optimizations for the previous generation (e.g. Pentium).
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# Currently only the following CPU generations are used:
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# i686 i585 i386
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#
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#MACHINE_CPU=i686 i586 i386
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# The CPUTYPE variable controls which processor should be targetted for
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# generated code. This controls processor-specific optimizations in
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# certain code (currently only OpenSSL) as well as modifying the value
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# of CFLAGS to contain the appropriate optimization directive to gcc.
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# The automatic setting of CFLAGS may be overridden using the
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# NO_CPU_CFLAGS variable below.
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# Currently the following CPU types are recognised:
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# Intel x86 architecture: k7 k6 k5 i686 i585 i486 i386
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# Alpha/AXP architecture: ev6 pca56 ev56 ev5 ev45 ev4
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# Intel ia64 architecture: itanium
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#
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#CPUTYPE=i686
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#NO_CPU_CFLAGS= true # Don't add -march=<cpu> to CFLAGS automatically
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#
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# CFLAGS controls the compiler settings used when compiling C code.
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# Note that optimization settings above -O (-O2, ...) are not recommended
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@ -13,18 +13,20 @@
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# You have to find the things you can put here in the Makefiles and
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# documentation of the source tree.
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#
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#
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# MACHINE_CPU controls which processor-specific optimizations will be
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# used by certain components of FreeBSD (currently only OpenSSL).
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# This should be set to a list of your CPU type, plus all previous
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# generations of the CPU architecture. The reason for using a list is
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# because not all programs which use the MACHINE_CPU variable may have
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# optimizations for your specific CPU generation (e.g. Pentium Pro),
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# but may have optimizations for the previous generation (e.g. Pentium).
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# Currently only the following CPU generations are used:
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# i686 i585 i386
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#
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#MACHINE_CPU=i686 i586 i386
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# The CPUTYPE variable controls which processor should be targetted for
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# generated code. This controls processor-specific optimizations in
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# certain code (currently only OpenSSL) as well as modifying the value
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# of CFLAGS to contain the appropriate optimization directive to gcc.
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# The automatic setting of CFLAGS may be overridden using the
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# NO_CPU_CFLAGS variable below.
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# Currently the following CPU types are recognised:
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# Intel x86 architecture: k7 k6 k5 i686 i585 i486 i386
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# Alpha/AXP architecture: ev6 pca56 ev56 ev5 ev45 ev4
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# Intel ia64 architecture: itanium
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#
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#CPUTYPE=i686
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#NO_CPU_CFLAGS= true # Don't add -march=<cpu> to CFLAGS automatically
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#
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# CFLAGS controls the compiler settings used when compiling C code.
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# Note that optimization settings above -O (-O2, ...) are not recommended
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101
share/mk/bsd.cpu.mk
Normal file
101
share/mk/bsd.cpu.mk
Normal file
@ -0,0 +1,101 @@
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# $FreeBSD$
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# Set default baseline values of CPUTYPE based on MACHINE_ARCH -- this is
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# the minimum CPU type we support for each architecture
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.if ${MACHINE_ARCH} == "i386"
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CPUTYPE ?= i386
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.elif ${MACHINE_ARCH} == "alpha"
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CPUTYPE ?= ev4
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.elif ${MACHINE_ARCH} == "ia64"
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CPUTYPE ?= itanium
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.endif
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# Handle aliases (not documented in make.conf to avoid user confusion
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# between e.g. i586 and pentium)
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.if ${MACHINE_ARCH} == "i386"
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. if ${CPUTYPE} == "pentiumpro"
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CPUTYPE = i686
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. elif ${CPUTYPE} == "pentium"
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CPUTYPE = i586
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. elif ${CPUTYPE} == "athlon"
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CPUTYPE = k7
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. endif
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.endif
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# Logic to set up correct gcc optimization flag. This must be included
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# after /etc/make.conf so it can react to the local value of CPUTYPE
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# defined therein.
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.if !defined(NO_CPU_CFLAGS)
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. if ${MACHINE_ARCH} == "i386"
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. if ${CPUTYPE} == "k7"
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CFLAGS += -march=k6 # gcc doesn't support athlon yet, but it will
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. elif ${CPUTYPE} == "k6"
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CFLAGS += -march=k6
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. elif ${CPUTYPE} == "k5"
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CFLAGS += -march=pentium
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. elif ${CPUTYPE} == "i686"
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CFLAGS += -march=pentiumpro
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. elif ${CPUTYPE} == "i586"
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CFLAGS += -march=pentium
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. elif ${CPUTYPE} == "i486"
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CFLAGS += -m486
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. endif
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. elif ${MACHINE_ARCH} == "alpha"
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. if ${CPUTYPE} == "ev6"
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CFLAGS += -mcpu=ev6
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. elif ${CPUTYPE} == "pca56"
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CFLAGS += -mcpu=pca56
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. elif ${CPUTYPE} == "ev56"
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CFLAGS += -mcpu=ev56
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. elif ${CPUTYPE} == "ev5"
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CFLAGS += -mcpu=ev5
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. elif ${CPUTYPE} == "ev45"
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CFLAGS += -mcpu=ev4 # No -mcpu=ev45 for gcc
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. elif ${CPUTYPE} == "ev4"
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CFLAGS += -mcpu=ev4
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. endif
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. endif
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.endif
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# Set up the list of CPU features based on the CPU type. This is an
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# unordered list to make it easy for client makefiles to test for the
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# presence of a CPU feature.
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.if ${MACHINE_ARCH} == "i386"
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. if ${CPUTYPE} == "k7"
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MACHINE_CPU = k7 k6 k5 i586 i486 i386
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. elif ${CPUTYPE} == "k6"
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MACHINE_CPU = k6 k5 i586 i486 i386
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. elif ${CPUTYPE} == "k5"
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MACHINE_CPU = k5 i586 i486 i386
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. elif ${CPUTYPE} == "i686"
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MACHINE_CPU = i686 i586 i486 i386
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. elif ${CPUTYPE} == "i586"
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MACHINE_CPU = i586 i486 i386
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. elif ${CPUTYPE} == "i486"
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MACHINE_CPU = i486 i386
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. elif ${CPUTYPE} == "i386"
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MACHINE_CPU = i386
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. endif
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.elif ${MACHINE_ARCH} == "alpha"
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. if ${CPUTYPE} == "ev6"
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MACHINE_CPU = ev6 ev56 pca56 ev5 ev45 ev4
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. elif ${CPUTYPE} == "pca56"
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MACHINE_CPU = pca56 ev56 ev5 ev45 ev4
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. elif ${CPUTYPE} == "ev56"
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MACHINE_CPU = ev56 ev5 ev45 ev4
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. elif ${CPUTYPE} == "ev5"
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MACHINE_CPU = ev5 ev45 ev4
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. elif ${CPUTYPE} == "ev45"
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MACHINE_CPU = ev45 ev4
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. elif ${CPUTYPE} == "ev4"
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MACHINE_CPU = ev4
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. endif
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.elif ${MACHINE_ARCH} == "ia64"
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. if ${CPUTYPE} == "itanium"
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MACHINE_CPU = itanium
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. endif
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.endif
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@ -104,16 +104,6 @@ YFLAGS ?= -d
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# as an i386 architecture.
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MACHINE_ARCH ?= i386
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# MACHINE_CPU contains a list of CPU generations for which
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# CPU-specific optimizations are desired. This must be set here
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# to allow bootstrapping from old versions of make which do not
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# set MACHINE_CPU.
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.if ${MACHINE_ARCH} == "i386"
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MACHINE_CPU ?= i386
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.elif ${MACHINE_ARCH} == "alpha"
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MACHINE_CPU ?= ev4
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.endif
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# For tags rule.
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GTAGSFLAGS= -o
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HTAGSFLAGS=
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@ -254,6 +244,8 @@ HTAGSFLAGS=
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.include </etc/make.conf>
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.endif
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.include <bsd.cpu.mk>
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.if exists(/etc/make.conf.local)
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.error Error, original /etc/make.conf should be moved to the /etc/defaults/ directory and /etc/make.conf.local should be renamed to /etc/make.conf.
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.include </etc/make.conf.local>
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