freebsd-nq/share/mk/bsd.sys.mk
Dimitry Andric 883e0f87a4 During buildworld and buildkernel, define EARLY_BUILD in the earlier
stages (build-tools, cross-tools, etc) of the build, so we can detect in
bsd.*.mk whether to pass compiler-specific flags to ${CC}.

In particular, this commit will allow using WITH_CLANG_IS_CC when the
base compiler is still gcc, and when ${CC}, ${CXX} and ${CPP} are left
at their defaults.  The early stages will then be built using gcc, and
no clang-specific flags will be passed to it.  The later stages will be
built as usual.

The EARLY_BUILD define can also serve other uses, such as building the
world stage C++ executables with libc++ instead of libstdc++: during the
early build stages, we cannot assume libc++ is already available, so we
must still build with libstdc++ at that time.

MFC after:	1 week
2012-06-03 20:35:41 +00:00

131 lines
4.2 KiB
Makefile

# $FreeBSD$
#
# This file contains common settings used for building FreeBSD
# sources.
# Enable various levels of compiler warning checks. These may be
# overridden (e.g. if using a non-gcc compiler) by defining NO_WARNS.
# for GCC: http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Warning-Options.html
# the default is gnu99 for now
CSTD?= gnu99
.if ${CSTD} == "k&r"
CFLAGS+= -traditional
.elif ${CSTD} == "c89" || ${CSTD} == "c90"
CFLAGS+= -std=iso9899:1990
.elif ${CSTD} == "c94" || ${CSTD} == "c95"
CFLAGS+= -std=iso9899:199409
.elif ${CSTD} == "c99"
CFLAGS+= -std=iso9899:1999
.else # CSTD
CFLAGS+= -std=${CSTD}
.endif # CSTD
.if !defined(NO_WARNS)
# -pedantic is problematic because it also imposes namespace restrictions
#CFLAGS+= -pedantic
.if defined(WARNS)
.if ${WARNS} >= 1
CWARNFLAGS+= -Wsystem-headers
.if !defined(NO_WERROR) && ((${MK_CLANG_IS_CC} == "no" && \
${CC:T:Mclang} != "clang") || !defined(NO_WERROR.clang))
CWARNFLAGS+= -Werror
.endif # !NO_WERROR && (!CLANG || !NO_WERROR.clang)
.endif # WARNS >= 1
.if ${WARNS} >= 2
CWARNFLAGS+= -Wall -Wno-format-y2k
.endif # WARNS >= 2
.if ${WARNS} >= 3
CWARNFLAGS+= -W -Wno-unused-parameter -Wstrict-prototypes\
-Wmissing-prototypes -Wpointer-arith
.endif # WARNS >= 3
.if ${WARNS} >= 4
CWARNFLAGS+= -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow\
-Wunused-parameter
.if !defined(NO_WCAST_ALIGN) && ((${MK_CLANG_IS_CC} == "no" && \
${CC:T:Mclang} != "clang") || !defined(NO_WCAST_ALIGN.clang))
CWARNFLAGS+= -Wcast-align
.endif # !NO_WCAST_ALIGN && (!CLANG || !NO_WCAST_ALIGN.clang)
.endif # WARNS >= 4
# BDECFLAGS
.if ${WARNS} >= 6
CWARNFLAGS+= -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls\
-Wold-style-definition
.endif # WARNS >= 6
.if ${WARNS} >= 2 && ${WARNS} <= 4
# XXX Delete -Wuninitialized by default for now -- the compiler doesn't
# XXX always get it right.
CWARNFLAGS+= -Wno-uninitialized
.endif # WARNS >=2 && WARNS <= 4
CWARNFLAGS+= -Wno-pointer-sign
# Clang has more warnings enabled by default, and when using -Wall, so if WARNS
# is set to low values, these have to be disabled explicitly.
.if (${MK_CLANG_IS_CC} != "no" || ${CC:T:Mclang} == "clang") && \
!defined(EARLY_BUILD)
.if ${WARNS} <= 6
CWARNFLAGS+= -Wno-empty-body -Wno-string-plus-int
.endif # WARNS <= 6
.if ${WARNS} <= 3
CWARNFLAGS+= -Wno-tautological-compare -Wno-unused-value\
-Wno-parentheses-equality -Wno-unused-function -Wno-conversion
.endif # WARNS <= 3
.if ${WARNS} <= 2
CWARNFLAGS+= -Wno-switch -Wno-switch-enum
.endif # WARNS <= 2
.if ${WARNS} <= 1
CWARNFLAGS+= -Wno-parentheses
.endif # WARNS <= 1
.if defined(NO_WARRAY_BOUNDS)
CWARNFLAGS+= -Wno-array-bounds
.endif # NO_WARRAY_BOUNDS
.endif # CLANG
.endif # WARNS
.if defined(FORMAT_AUDIT)
WFORMAT= 1
.endif # FORMAT_AUDIT
.if defined(WFORMAT)
.if ${WFORMAT} > 0
#CWARNFLAGS+= -Wformat-nonliteral -Wformat-security -Wno-format-extra-args
CWARNFLAGS+= -Wformat=2 -Wno-format-extra-args
.if (${MK_CLANG_IS_CC} != "no" || ${CC:T:Mclang} == "clang") && \
!defined(EARLY_BUILD)
.if ${WARNS} <= 3
CWARNFLAGS+= -Wno-format-nonliteral
.endif # WARNS <= 3
.endif # CLANG
.if !defined(NO_WERROR) && ((${MK_CLANG_IS_CC} == "no" && \
${CC:T:Mclang} != "clang") || !defined(NO_WERROR.clang))
CWARNFLAGS+= -Werror
.endif # !NO_WERROR && (!CLANG || !NO_WERROR.clang)
.endif # WFORMAT > 0
.endif # WFORMAT
.if defined(NO_WFORMAT) || ((${MK_CLANG_IS_CC} != "no" || \
${CC:T:Mclang} == "clang") && defined(NO_WFORMAT.clang))
CWARNFLAGS+= -Wno-format
.endif # NO_WFORMAT || (CLANG && NO_WFORMAT.clang)
.endif # !NO_WARNS
.if defined(IGNORE_PRAGMA)
CWARNFLAGS+= -Wno-unknown-pragmas
.endif # IGNORE_PRAGMA
.if (${MK_CLANG_IS_CC} != "no" || ${CC:T:Mclang} == "clang") && \
!defined(EARLY_BUILD)
CLANG_NO_IAS= -no-integrated-as
CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3\
-mllvm -enable-load-pre=false -mllvm -simplifycfg-dup-ret
CFLAGS+= -Qunused-arguments
.endif # CLANG
.if ${MK_SSP} != "no" && ${MACHINE_CPUARCH} != "ia64" && \
${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
# Don't use -Wstack-protector as it breaks world with -Werror.
SSP_CFLAGS?= -fstack-protector
CFLAGS+= ${SSP_CFLAGS}
.endif # SSP && !IA64 && !ARM && !MIPS
# Allow user-specified additional warning flags
CFLAGS+= ${CWARNFLAGS}