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freebsd-src/share/mk/src.opts.mk
Bryan Drewery 8758abd5b3 Slightly rework the comments and logic for default Clang/GCC. 
This is because the previous version was very obscure about the fact
that despite having Clang "on by default" for architectures such as powerpc, it
does not actually build due to the GCC it uses not having C++11 support.
Using an external compiler that supports C++11 does allow this to work.
This whole block should be rethought more given "on by default" is not
really default without extra work which could actually be surprising for
why Clang is showing up when using a newer GCC.

Sponsored by:	EMC / Isilon Storage Division
2015-10-24 04:03:32 +00:00

404 lines
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Makefile
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# $FreeBSD$
#
# Option file for FreeBSD /usr/src builds.
#
# Users define WITH_FOO and WITHOUT_FOO on the command line or in /etc/src.conf
# and /etc/make.conf files. These translate in the build system to MK_FOO={yes,no}
# with sensible (usually) defaults.
#
# Makefiles must include bsd.opts.mk after defining specific MK_FOO options that
# are applicable for that Makefile (typically there are none, but sometimes there
# are exceptions). Recursive makes usually add MK_FOO=no for options that they wish
# to omit from that make.
#
# Makefiles must include bsd.mkopt.mk before they test the value of any MK_FOO
# variable.
#
# Makefiles may also assume that this file is included by src.opts.mk should it
# need variables defined there prior to the end of the Makefile where
# bsd.{subdir,lib.bin}.mk is traditionally included.
#
# The old-style YES_FOO and NO_FOO are being phased out. No new instances of them
# should be added. Old instances should be removed since they were just to
# bridge the gap between FreeBSD 4 and FreeBSD 5.
#
# Makefiles should never test WITH_FOO or WITHOUT_FOO directly (although an
# exception is made for _WITHOUT_SRCONF which turns off this mechanism
# completely inside bsd.*.mk files).
#
.if !target(__<src.opts.mk>__)
__<src.opts.mk>__:
.include <bsd.own.mk>
#
# Define MK_* variables (which are either "yes" or "no") for users
# to set via WITH_*/WITHOUT_* in /etc/src.conf and override in the
# make(1) environment.
# These should be tested with `== "no"' or `!= "no"' in makefiles.
# The NO_* variables should only be set by makefiles for variables
# that haven't been converted over.
#
# These options are used by src the builds
__DEFAULT_YES_OPTIONS = \
ACCT \
ACPI \
AMD \
APM \
AT \
ATM \
AUDIT \
AUTHPF \
AUTOFS \
BHYVE \
BINUTILS \
BINUTILS_BOOTSTRAP \
BLUETOOTH \
BOOT \
BOOTPARAMD \
BOOTPD \
BSD_CPIO \
BSDINSTALL \
BSNMP \
BZIP2 \
CALENDAR \
CAPSICUM \
CASPER \
CCD \
CDDL \
CPP \
CROSS_COMPILER \
CRYPT \
CTM \
CUSE \
CXX \
DICT \
DMAGENT \
DYNAMICROOT \
ED_CRYPTO \
EE \
ELFTOOLCHAIN_BOOTSTRAP \
EXAMPLES \
FDT \
FILE \
FINGER \
FLOPPY \
FMTREE \
FORTH \
FP_LIBC \
FREEBSD_UPDATE \
FTP \
GAMES \
GCOV \
GDB \
GNU \
GNU_GREP_COMPAT \
GPIO \
GPL_DTC \
GROFF \
HAST \
HTML \
HYPERV \
ICONV \
INET \
INET6 \
INETD \
IPFILTER \
IPFW \
ISCSI \
JAIL \
KDUMP \
KVM \
LDNS \
LDNS_UTILS \
LEGACY_CONSOLE \
LIB32 \
LIBPTHREAD \
LIBTHR \
LOCALES \
LOCATE \
LPR \
LS_COLORS \
LZMA_SUPPORT \
MAIL \
MAILWRAPPER \
MAKE \
MANDOCDB \
NDIS \
NETCAT \
NETGRAPH \
NLS_CATALOGS \
NS_CACHING \
NTP \
OPENSSL \
PAM \
PC_SYSINSTALL \
PF \
PKGBOOTSTRAP \
PMC \
PORTSNAP \
PPP \
QUOTAS \
RADIUS_SUPPORT \
RCMDS \
RBOOTD \
RCS \
RESCUE \
ROUTED \
SENDMAIL \
SETUID_LOGIN \
SHAREDOCS \
SOURCELESS \
SOURCELESS_HOST \
SOURCELESS_UCODE \
SVNLITE \
SYSCONS \
TALK \
TCP_WRAPPERS \
TCSH \
TELNET \
TESTS \
TEXTPROC \
TFTP \
TIMED \
UNBOUND \
USB \
UTMPX \
VI \
VT \
WIRELESS \
WPA_SUPPLICANT_EAPOL \
ZFS \
ZONEINFO
__DEFAULT_NO_OPTIONS = \
BSD_GREP \
CLANG_EXTRAS \
DTRACE_TESTS \
EISA \
HESIOD \
LLDB \
NAND \
OFED \
OPENLDAP \
OPENSSH_NONE_CIPHER \
SHARED_TOOLCHAIN \
SORT_THREADS \
SVN
#
# Default behaviour of some options depends on the architecture. Unfortunately
# this means that we have to test TARGET_ARCH (the buildworld case) as well
# as MACHINE_ARCH (the non-buildworld case). Normally TARGET_ARCH is not
# used at all in bsd.*.mk, but we have to make an exception here if we want
# to allow defaults for some things like clang to vary by target architecture.
# Additional, per-target behavior should be rarely added only after much
# gnashing of teeth and grinding of gears.
#
.if defined(TARGET_ARCH)
__T=${TARGET_ARCH}
.else
__T=${MACHINE_ARCH}
.endif
.if defined(TARGET)
__TT=${TARGET}
.else
__TT=${MACHINE}
.endif
.include <bsd.compiler.mk>
# If the compiler is not C++11 capable, disable Clang and use GCC instead.
# This means that architectures that have GCC 4.2 as default can not
# build Clang without using an external compiler.
.if ${COMPILER_FEATURES:Mc++11} && (${__T} == "aarch64" || \
${__T} == "amd64" || ${__TT} == "arm" || ${__T} == "i386")
# Clang is enabled, and will be installed as the default /usr/bin/cc.
__DEFAULT_YES_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
__DEFAULT_NO_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX
.elif ${COMPILER_FEATURES:Mc++11} && ${__T:Mpowerpc*}
# On powerpc, if an external compiler that supports C++11 is used as ${CC},
# then Clang is enabled, but GCC is installed as the default /usr/bin/cc.
__DEFAULT_YES_OPTIONS+=CLANG CLANG_FULL GCC GCC_BOOTSTRAP GNUCXX
__DEFAULT_NO_OPTIONS+=CLANG_BOOTSTRAP CLANG_IS_CC
.else
# Everything else disables Clang, and uses GCC instead.
__DEFAULT_YES_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX
__DEFAULT_NO_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
.endif
.if ${__T} == "aarch64"
BROKEN_OPTIONS+=BINUTILS BINUTILS_BOOTSTRAP GCC GCC_BOOTSTRAP GDB
__DEFAULT_YES_OPTIONS+=ELFCOPY_AS_OBJCOPY
.else
__DEFAULT_NO_OPTIONS+=ELFCOPY_AS_OBJCOPY
.endif
# LLVM lacks support for FreeBSD 64-bit atomic operations for ARMv4/ARMv5
.if ${__T} == "arm" || ${__T} == "armeb"
BROKEN_OPTIONS+=LLDB
.endif
.include <bsd.mkopt.mk>
#
# MK_* options that default to "yes" if the compiler is a C++11 compiler.
#
.for var in \
LIBCPLUSPLUS
.if !defined(MK_${var})
.if ${COMPILER_FEATURES:Mc++11}
.if defined(WITHOUT_${var})
MK_${var}:= no
.else
MK_${var}:= yes
.endif
.else
.if defined(WITH_${var})
MK_${var}:= yes
.else
MK_${var}:= no
.endif
.endif
.endif
.endfor
#
# Force some options off if their dependencies are off.
# Order is somewhat important.
#
.if ${MK_LIBPTHREAD} == "no"
MK_LIBTHR:= no
.endif
.if ${MK_LDNS} == "no"
MK_LDNS_UTILS:= no
MK_UNBOUND:= no
.endif
.if ${MK_SOURCELESS} == "no"
MK_SOURCELESS_HOST:= no
MK_SOURCELESS_UCODE:= no
.endif
.if ${MK_CDDL} == "no"
MK_ZFS:= no
MK_CTF:= no
.endif
.if ${MK_CRYPT} == "no"
MK_OPENSSL:= no
MK_OPENSSH:= no
MK_KERBEROS:= no
.endif
.if ${MK_CXX} == "no"
MK_CLANG:= no
MK_GROFF:= no
MK_GNUCXX:= no
.endif
.if ${MK_MAIL} == "no"
MK_MAILWRAPPER:= no
MK_SENDMAIL:= no
MK_DMAGENT:= no
.endif
.if ${MK_NETGRAPH} == "no"
MK_ATM:= no
MK_BLUETOOTH:= no
.endif
.if ${MK_OPENSSL} == "no"
MK_OPENSSH:= no
MK_KERBEROS:= no
.endif
.if ${MK_PF} == "no"
MK_AUTHPF:= no
.endif
.if ${MK_TESTS} == "no"
MK_DTRACE_TESTS:= no
.endif
.if ${MK_TEXTPROC} == "no"
MK_GROFF:= no
.endif
.if ${MK_CROSS_COMPILER} == "no"
MK_BINUTILS_BOOTSTRAP:= no
MK_CLANG_BOOTSTRAP:= no
MK_ELFTOOLCHAIN_BOOTSTRAP:= no
MK_GCC_BOOTSTRAP:= no
.endif
.if ${MK_TOOLCHAIN} == "no"
MK_BINUTILS:= no
MK_CLANG:= no
MK_GCC:= no
MK_GDB:= no
MK_INCLUDES:= no
.endif
.if ${MK_CLANG} == "no"
MK_CLANG_EXTRAS:= no
MK_CLANG_FULL:= no
.endif
#
# Set defaults for the MK_*_SUPPORT variables.
#
#
# MK_*_SUPPORT options which default to "yes" unless their corresponding
# MK_* variable is set to "no".
#
.for var in \
BZIP2 \
GNU \
INET \
INET6 \
KERBEROS \
KVM \
NETGRAPH \
PAM \
TESTS \
WIRELESS
.if defined(WITHOUT_${var}_SUPPORT) || ${MK_${var}} == "no"
MK_${var}_SUPPORT:= no
.else
MK_${var}_SUPPORT:= yes
.endif
.endfor
#
# MK_* options whose default value depends on another option.
#
.for vv in \
GSSAPI/KERBEROS \
MAN_UTILS/MAN
.if defined(WITH_${vv:H})
MK_${vv:H}:= yes
.elif defined(WITHOUT_${vv:H})
MK_${vv:H}:= no
.else
MK_${vv:H}:= ${MK_${vv:T}}
.endif
.endfor
.if !${COMPILER_FEATURES:Mc++11}
MK_LLDB:= no
.endif
# gcc 4.8 and newer supports libc++, so suppress gnuc++ in that case.
# while in theory we could build it with that, we don't want to do
# that since it creates too much confusion for too little gain.
.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 40800
MK_GNUCXX:=no
MK_GCC:=no
.endif
.endif # !target(__<src.opts.mk>__)
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