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freebsd-dev/share/mk/bsd.sys.mk
John Baldwin 73fd212c81 Suppress -Wempty-body warnings in GCC 6.x and later. 
libc++ in LLVM 11 uses an empty else clause in
include/c++/v1/__thread_support which triggers this warning.

Reviewed by:	dim, emaste
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D26257
2020-08-31 21:57:01 +00:00

428 lines
13 KiB
Makefile
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# $FreeBSD$
#
# 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 MK_WARNS=no.
# for GCC: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
# for clang: https://clang.llvm.org/docs/DiagnosticsReference.html
.include <bsd.compiler.mk>
# the default is gnu99 for now
CSTD?= gnu99
.if ${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 !empty(CXXSTD)
CXXFLAGS+= -std=${CXXSTD}
.endif
# -pedantic is problematic because it also imposes namespace restrictions
#CFLAGS+= -pedantic
.if defined(WARNS)
.if ${WARNS} >= 1
CWARNFLAGS+= -Wsystem-headers
.if !defined(NO_WERROR) && !defined(NO_WERROR.${COMPILER_TYPE})
CWARNFLAGS+= -Werror
.endif # !NO_WERROR && !NO_WERROR.${COMPILER_TYPE}
.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 ${WARNS} >= 4
CWARNFLAGS+= -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow\
-Wunused-parameter
.if !defined(NO_WCAST_ALIGN) && !defined(NO_WCAST_ALIGN.${COMPILER_TYPE})
CWARNFLAGS+= -Wcast-align
.endif # !NO_WCAST_ALIGN !NO_WCAST_ALIGN.${COMPILER_TYPE}
.endif # WARNS >= 4
.if ${WARNS} >= 6
CWARNFLAGS+= -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls\
-Wold-style-definition
.if !defined(NO_WMISSING_VARIABLE_DECLARATIONS)
CWARNFLAGS.clang+= -Wmissing-variable-declarations
.endif
.if !defined(NO_WTHREAD_SAFETY)
CWARNFLAGS.clang+= -Wthread-safety
.endif
.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 ${WARNS} <= 6
CWARNFLAGS.clang+= -Wno-empty-body -Wno-string-plus-int
CWARNFLAGS.clang+= -Wno-unused-const-variable
.endif # WARNS <= 6
.if ${WARNS} <= 3
CWARNFLAGS.clang+= -Wno-tautological-compare -Wno-unused-value\
-Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
CWARNFLAGS.clang+= -Wno-unused-local-typedef
CWARNFLAGS.clang+= -Wno-address-of-packed-member
.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 90100
CWARNFLAGS.gcc+= -Wno-address-of-packed-member
.endif
.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 70000 && \
${MACHINE_CPUARCH} == "arm" && !${MACHINE_ARCH:Marmv[67]*}
CWARNFLAGS.clang+= -Wno-atomic-alignment
.endif
.endif # WARNS <= 3
.if ${WARNS} <= 2
CWARNFLAGS.clang+= -Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter
.endif # WARNS <= 2
.if ${WARNS} <= 1
CWARNFLAGS.clang+= -Wno-parentheses
.endif # WARNS <= 1
.if defined(NO_WARRAY_BOUNDS)
CWARNFLAGS.clang+= -Wno-array-bounds
.endif # NO_WARRAY_BOUNDS
.if defined(NO_WMISLEADING_INDENTATION) && \
((${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 100000) || \
${COMPILER_TYPE} == "gcc")
CWARNFLAGS+= -Wno-misleading-indentation
.endif # NO_WMISLEADING_INDENTATION
.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 ${WARNS} <= 3
CWARNFLAGS.clang+= -Wno-format-nonliteral
.endif # WARNS <= 3
.if !defined(NO_WERROR) && !defined(NO_WERROR.${COMPILER_TYPE})
CWARNFLAGS+= -Werror
.endif # !NO_WERROR && !NO_WERROR.${COMPILER_TYPE}
.endif # WFORMAT > 0
.endif # WFORMAT
.if defined(NO_WFORMAT) || defined(NO_WFORMAT.${COMPILER_TYPE})
CWARNFLAGS+= -Wno-format
.endif # NO_WFORMAT || NO_WFORMAT.${COMPILER_TYPE}
# GCC
# We should clean up warnings produced with these flags.
# They were originally added as a quick hack to enable gcc5/6.
# The base system requires at least GCC 6.4, but some ports
# use this file with older compilers. Request an exprun
# before changing these.
.if ${COMPILER_TYPE} == "gcc"
# GCC 5.2.0
.if ${COMPILER_VERSION} >= 50200
CWARNFLAGS+= -Wno-error=address \
-Wno-error=array-bounds \
-Wno-error=attributes \
-Wno-error=bool-compare \
-Wno-error=cast-align \
-Wno-error=clobbered \
-Wno-error=deprecated-declarations \
-Wno-error=enum-compare \
-Wno-error=extra \
-Wno-error=inline \
-Wno-error=logical-not-parentheses \
-Wno-error=strict-aliasing \
-Wno-error=uninitialized \
-Wno-error=unused-but-set-variable \
-Wno-error=unused-function \
-Wno-error=unused-value
.endif
# GCC 6.1.0
.if ${COMPILER_VERSION} >= 60100
CWARNFLAGS+= -Wno-error=empty-body \
-Wno-error=maybe-uninitialized \
-Wno-error=nonnull-compare \
-Wno-error=redundant-decls \
-Wno-error=shift-negative-value \
-Wno-error=tautological-compare \
-Wno-error=unused-const-variable
.endif
# GCC 7.1.0
.if ${COMPILER_VERSION} >= 70100
CWARNFLAGS+= -Wno-error=bool-operation \
-Wno-error=deprecated \
-Wno-error=expansion-to-defined \
-Wno-error=format-overflow \
-Wno-error=format-truncation \
-Wno-error=implicit-fallthrough \
-Wno-error=int-in-bool-context \
-Wno-error=memset-elt-size \
-Wno-error=noexcept-type \
-Wno-error=nonnull \
-Wno-error=pointer-compare \
-Wno-error=stringop-overflow
.endif
# GCC 8.1.0
.if ${COMPILER_VERSION} >= 80100
CWARNFLAGS+= -Wno-error=aggressive-loop-optimizations \
-Wno-error=cast-function-type \
-Wno-error=catch-value \
-Wno-error=multistatement-macros \
-Wno-error=restrict \
-Wno-error=sizeof-pointer-memaccess \
-Wno-error=stringop-truncation
.endif
# GCC's own arm_neon.h triggers various warnings
.if ${MACHINE_ARCH} == "aarch64"
CWARNFLAGS+= -Wno-system-headers
.endif
.endif # gcc
# How to handle FreeBSD custom printf format specifiers.
.if ${COMPILER_TYPE} == "clang"
FORMAT_EXTENSIONS= -D__printf__=__freebsd_kprintf__
.else
FORMAT_EXTENSIONS= -fformat-extensions
.endif
.if defined(IGNORE_PRAGMA)
CWARNFLAGS+= -Wno-unknown-pragmas
.endif # IGNORE_PRAGMA
# This warning is utter nonsense
CFLAGS+= -Wno-format-zero-length
.if ${COMPILER_TYPE} == "clang"
# The headers provided by clang are incompatible with the FreeBSD headers.
# If the version of clang is not one that has been patched to omit the
# incompatible headers, we need to compile with -nobuiltininc and add the
# resource dir to the end of the search paths. This ensures that headers such as
# immintrin.h are still found but stddef.h, etc. are picked up from FreeBSD.
#
# XXX: This is a hack to support complete external installs of clang while
# we work to synchronize our decleration guards with those in the clang tree.
.if ${MK_CLANG_BOOTSTRAP:Uno} == "no" && \
${COMPILER_RESOURCE_DIR} != "unknown" && !defined(BOOTSTRAPPING)
CFLAGS+=-nobuiltininc -idirafter ${COMPILER_RESOURCE_DIR}/include
.endif
.endif
CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3\
-mllvm -simplifycfg-dup-ret
CLANG_OPT_SMALL+= -mllvm -enable-load-pre=false
CFLAGS.clang+= -Qunused-arguments
# The libc++ headers use c++11 extensions. These are normally silenced because
# they are treated as system headers, but we explicitly disable that warning
# suppression when building the base system to catch bugs in our headers.
# Eventually we'll want to start building the base system C++ code as C++11,
# but not yet.
CXXFLAGS.clang+= -Wno-c++11-extensions
.if ${MK_SSP} != "no" && \
${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
# Don't use -Wstack-protector as it breaks world with -Werror.
SSP_CFLAGS?= -fstack-protector-strong
CFLAGS+= ${SSP_CFLAGS}
.endif # SSP && !ARM && !MIPS
# Additional flags passed in CFLAGS and CXXFLAGS when MK_DEBUG_FILES is
# enabled.
DEBUG_FILES_CFLAGS?= -g
# Allow user-specified additional warning flags, plus compiler and file
# specific flag overrides, unless we've overridden this...
.if ${MK_WARNS} != "no"
CFLAGS+= ${CWARNFLAGS:M*} ${CWARNFLAGS.${COMPILER_TYPE}}
CFLAGS+= ${CWARNFLAGS.${.IMPSRC:T}}
CXXFLAGS+= ${CXXWARNFLAGS:M*} ${CXXWARNFLAGS.${COMPILER_TYPE}}
CXXFLAGS+= ${CXXWARNFLAGS.${.IMPSRC:T}}
.endif
CFLAGS+= ${CFLAGS.${COMPILER_TYPE}}
CXXFLAGS+= ${CXXFLAGS.${COMPILER_TYPE}}
AFLAGS+= ${AFLAGS.${.IMPSRC:T}}
AFLAGS+= ${AFLAGS.${.TARGET:T}}
ACFLAGS+= ${ACFLAGS.${.IMPSRC:T}}
ACFLAGS+= ${ACFLAGS.${.TARGET:T}}
CFLAGS+= ${CFLAGS.${.IMPSRC:T}}
CXXFLAGS+= ${CXXFLAGS.${.IMPSRC:T}}
LDFLAGS+= ${LDFLAGS.${LINKER_TYPE}}
# Only allow .TARGET when not using PROGS as it has the same syntax
# per PROG which is ambiguous with this syntax. This is only needed
# for PROG_VARS vars.
.if !defined(_RECURSING_PROGS)
.if ${MK_WARNS} != "no"
CFLAGS+= ${CWARNFLAGS.${.TARGET:T}}
.endif
CFLAGS+= ${CFLAGS.${.TARGET:T}}
CXXFLAGS+= ${CXXFLAGS.${.TARGET:T}}
LDFLAGS+= ${LDFLAGS.${.TARGET:T}}
LDADD+= ${LDADD.${.TARGET:T}}
LIBADD+= ${LIBADD.${.TARGET:T}}
.endif
.if defined(SRCTOP)
# Prevent rebuilding during install to support read-only objdirs.
.if ${.TARGETS:M*install*} == ${.TARGETS} && empty(.MAKE.MODE:Mmeta)
CFLAGS+= ERROR-tried-to-rebuild-during-make-install
.endif
.endif
# Please keep this if in sync with kern.mk
.if ${LD} != "ld" && (${CC:[1]:H} != ${LD:[1]:H} || ${LD:[1]:T} != "ld")
# Add -fuse-ld=${LD} if $LD is in a different directory or not called "ld".
# Note: Clang 12+ will prefer --ld-path= over -fuse-ld=.
.if ${COMPILER_TYPE} == "clang"
# Note: Clang does not like relative paths in -fuse-ld so we map ld.lld -> lld.
LDFLAGS+= -fuse-ld=${LD:[1]:S/^ld.//1W}
.else
# GCC does not support an absolute path for -fuse-ld so we just print this
# warning instead and let the user add the required symlinks.
.warning LD (${LD}) is not the default linker for ${CC} but -fuse-ld= is not supported
.endif
.endif
# Tell bmake not to mistake standard targets for things to be searched for
# or expect to ever be up-to-date.
PHONY_NOTMAIN = analyze afterdepend afterinstall all beforedepend beforeinstall \
beforelinking build build-tools buildconfig buildfiles \
buildincludes check checkdpadd clean cleandepend cleandir \
cleanobj configure depend distclean distribute exe \
files html includes install installconfig installdirs \
installfiles installincludes lint obj objlink objs objwarn \
realinstall tags whereobj
# we don't want ${PROG} to be PHONY
.PHONY: ${PHONY_NOTMAIN:N${PROG:U}}
.NOTMAIN: ${PHONY_NOTMAIN:Nall}
.if ${MK_STAGING} != "no"
.if defined(_SKIP_BUILD) || (!make(all) && !make(clean*) && !make(*clean))
_SKIP_STAGING?= yes
.endif
.if ${_SKIP_STAGING:Uno} == "yes"
staging stage_libs stage_files stage_as stage_links stage_symlinks:
.else
# allow targets like beforeinstall to be leveraged
DESTDIR= ${STAGE_OBJTOP}
.export DESTDIR
.if target(beforeinstall)
.if !empty(_LIBS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
staging: beforeinstall
.endif
.endif
# normally only libs and includes are staged
.if ${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG)
STAGE_DIR.prog= ${STAGE_OBJTOP}${BINDIR}
.if !empty(PROG)
.if defined(PROGNAME)
STAGE_AS_SETS+= prog
STAGE_AS_${PROG}= ${PROGNAME}
stage_as.prog: ${PROG}
.else
STAGE_SETS+= prog
stage_files.prog: ${PROG}
STAGE_TARGETS+= stage_files
.endif
.endif
.endif
.if !empty(_LIBS) && !defined(INTERNALLIB)
.if defined(SHLIBDIR) && ${SHLIBDIR} != ${LIBDIR} && ${_LIBS:Uno:M*.so.*} != ""
STAGE_SETS+= shlib
STAGE_DIR.shlib= ${STAGE_OBJTOP}${SHLIBDIR}
STAGE_FILES.shlib+= ${_LIBS:M*.so.*}
stage_files.shlib: ${_LIBS:M*.so.*}
.endif
.if defined(SHLIB_LINK) && commands(${SHLIB_LINK:R}.ld)
STAGE_AS_SETS+= ldscript
STAGE_AS.ldscript+= ${SHLIB_LINK:R}.ld
stage_as.ldscript: ${SHLIB_LINK:R}.ld
STAGE_DIR.ldscript = ${STAGE_LIBDIR}
STAGE_AS_${SHLIB_LINK:R}.ld:= ${SHLIB_LINK}
NO_SHLIB_LINKS=
.endif
.if target(stage_files.shlib)
stage_libs: ${_LIBS}
.if defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
stage_files.shlib: ${SHLIB_NAME}.symbols
.endif
.else
stage_libs: ${_LIBS}
.endif
.if defined(SHLIB_NAME) && defined(DEBUG_FLAGS) && target(${SHLIB_NAME}.symbols)
stage_libs: ${SHLIB_NAME}.symbols
.endif
.endif
.if !empty(INCS) || !empty(INCSGROUPS) && target(buildincludes)
.if !defined(NO_BEFOREBUILD_INCLUDES)
stage_includes: buildincludes
beforebuild: stage_includes
.endif
.endif
.for t in stage_libs stage_files stage_as
.if target($t)
STAGE_TARGETS+= $t
.endif
.endfor
.if !empty(STAGE_AS_SETS)
STAGE_TARGETS+= stage_as
.endif
.if !empty(STAGE_TARGETS) || (${MK_STAGING_PROG} != "no" && !defined(INTERNALPROG))
.if !empty(LINKS)
STAGE_TARGETS+= stage_links
.if ${MAKE_VERSION} < 20131001
stage_links.links: ${_LIBS} ${PROG}
.endif
STAGE_SETS+= links
STAGE_LINKS.links= ${LINKS}
.endif
.if !empty(SYMLINKS)
STAGE_TARGETS+= stage_symlinks
STAGE_SETS+= links
STAGE_SYMLINKS.links= ${SYMLINKS}
.endif
.endif
.include <meta.stage.mk>
.endif
.endif
.if defined(META_TARGETS)
.for _tgt in ${META_TARGETS}
.if target(${_tgt})
${_tgt}: ${META_DEPS}
.endif
.endfor
.endif
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