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freebsd-src/lib/libc/Makefile
Brooks Davis d7847a8d35 lib{c,sys}: return wrapped syscall APIs to libc 
These provide standard APIs, but are implemented using another system
call (e.g., pipe implemented in terms of pipe2) or are interposed by the
threading library to support cancelation.

After discussion with kib (see D44111), I've concluded that it is
better to keep most public interfaces in libc with as little
as possible in libsys.

Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D44241
2024-03-13 18:36:02 +00:00

225 lines
6.9 KiB
Makefile
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PACKAGE= clibs
SHLIBDIR?= /lib
.include <src.opts.mk>
LIBC_SRCTOP?= ${.CURDIR}
LIBSYS_SRCTOP?= ${.CURDIR:H}/libsys
# Pick the current architecture directory for libc. In general, this is named
# MACHINE_CPUARCH, but some ABIs are different enough to require their own libc,
# so allow a directory named MACHINE_ARCH to override this (though treat
# powerpc64le and powerpc64 the same).
# Note: This is copied to msun/Makefile
M=${MACHINE_ARCH:S/powerpc64le/powerpc64/}
.if exists(${LIBC_SRCTOP}/${M})
LIBC_ARCH=${M}
.else
LIBC_ARCH=${MACHINE_CPUARCH}
.endif
# All library objects contain FreeBSD revision strings by default; they may be
# excluded as a space-saving measure. To produce a library that does
# not contain these strings, add -DSTRIP_FBSDID (see <sys/cdefs.h>) to CFLAGS
# below. Note: there are no IDs for syscall stubs whose sources are generated.
# To include legacy CSRG SCCS ID strings, remove -DNO__SCCSID from CFLAGS.
# To include RCS ID strings from other BSD projects, remove -DNO__RCSID from CFLAGS.
CFLAGS+=-DNO__SCCSID -DNO__RCSID
LIB=c
SHLIB_MAJOR= 7
.if ${MK_SSP} != "no" && \
(${LIBC_ARCH} == "i386" || ${LIBC_ARCH:Mpowerpc*} != "")
SHLIB_LDSCRIPT=libc.ldscript
.else
SHLIB_LDSCRIPT=libc_nossp.ldscript
.endif
SHLIB_LDSCRIPT_LINKS=libxnet.so
WARNS?= 2
CFLAGS+=-I${LIBC_SRCTOP}/include -I${SRCTOP}/include
CFLAGS+=-I${LIBC_SRCTOP}/${LIBC_ARCH}
CFLAGS+=-I${LIBSYS_SRCTOP}/${LIBC_ARCH}
.if ${MK_NLS} != "no"
CFLAGS+=-DNLS
.endif
CLEANFILES+=tags
INSTALL_PIC_ARCHIVE=
BUILD_NOSSP_PIC_ARCHIVE=
PRECIOUSLIB=
.ifndef NO_THREAD_STACK_UNWIND
CANCELPOINTS_CFLAGS=-fexceptions
CFLAGS+=${CANCELPOINTS_CFLAGS}
.endif
# Use a more efficient TLS model for libc since we can reasonably assume that
# it will be loaded during program startup.
CFLAGS+= -ftls-model=initial-exec
#
# Link with static libcompiler_rt.a.
#
LDFLAGS+= -nodefaultlibs
LIBADD+= compiler_rt
LIBADD+= sys
.if defined(COMPAT_libcompat)
# XXX: work around gcc -m32 + bfd ld path issue for DT_NEEDED symbols.
# https://sourceware.org/bugzilla/show_bug.cgi?id=31395
LDFLAGS+= -Wl,--rpath=/usr/lib${COMPAT_libcompat}
.endif
LDFLAGS+=-Wl,--auxiliary,libsys.so.7
.if ${MK_SSP} != "no" && \
(${LIBC_ARCH} == "i386" || ${LIBC_ARCH:Mpowerpc*} != "")
LIBADD+= ssp_nonshared
.endif
# Extras that live in either libc.a or libc_nonshared.a
LIBC_NONSHARED_SRCS=
RTLD_ELF_DIR=${SRCTOP}/libexec/rtld-elf
.if exists(${RTLD_ELF_DIR}/${MACHINE_ARCH:S/powerpc64le/powerpc64/})
RTLD_ARCH= ${MACHINE_ARCH:S/powerpc64le/powerpc64/}
.else
RTLD_ARCH= ${MACHINE_CPUARCH}
.endif
RTLD_HDRS= -I${RTLD_ELF_DIR}/${RTLD_ARCH} -I${RTLD_ELF_DIR}
# Define (empty) variables so that make doesn't give substitution
# errors if the included makefiles don't change these:
MDSRCS=
MISRCS=
MDASM=
MIASM=
NOASM=
.include "${LIBC_SRCTOP}/${LIBC_ARCH}/Makefile.inc"
.include "${LIBC_SRCTOP}/csu/Makefile.inc"
.include "${LIBC_SRCTOP}/db/Makefile.inc"
.include "${LIBC_SRCTOP}/compat-43/Makefile.inc"
.include "${LIBC_SRCTOP}/gdtoa/Makefile.inc"
.include "${LIBC_SRCTOP}/gen/Makefile.inc"
.include "${LIBC_SRCTOP}/gmon/Makefile.inc"
.if ${MK_ICONV} != "no"
.include "${LIBC_SRCTOP}/iconv/Makefile.inc"
.endif
.include "${LIBC_SRCTOP}/inet/Makefile.inc"
.include "${LIBC_SRCTOP}/isc/Makefile.inc"
.include "${LIBC_SRCTOP}/locale/Makefile.inc"
.include "${LIBC_SRCTOP}/md/Makefile.inc"
.include "${LIBC_SRCTOP}/nameser/Makefile.inc"
.include "${LIBC_SRCTOP}/net/Makefile.inc"
.include "${LIBC_SRCTOP}/nls/Makefile.inc"
.include "${LIBC_SRCTOP}/posix1e/Makefile.inc"
.if ${MACHINE_ABI:Mlong32}
.include "${LIBC_SRCTOP}/quad/Makefile.inc"
.endif
.include "${LIBC_SRCTOP}/regex/Makefile.inc"
.include "${LIBC_SRCTOP}/resolv/Makefile.inc"
.include "${LIBC_SRCTOP}/stdio/Makefile.inc"
.include "${LIBC_SRCTOP}/stdlib/Makefile.inc"
.include "${LIBC_SRCTOP}/stdtime/Makefile.inc"
.include "${LIBC_SRCTOP}/string/Makefile.inc"
.include "${LIBC_SRCTOP}/sys/Makefile.inc"
.include "${LIBC_SRCTOP}/secure/Makefile.inc"
.include "${LIBC_SRCTOP}/rpc/Makefile.inc"
.include "${LIBC_SRCTOP}/uuid/Makefile.inc"
.include "${LIBC_SRCTOP}/xdr/Makefile.inc"
.if (${LIBC_ARCH} == "arm" && (defined(CPUTYPE) && ${CPUTYPE:M*soft*}))
.include "${LIBC_SRCTOP}/softfloat/Makefile.inc"
.endif
.if ${LIBC_ARCH} == "i386" || ${LIBC_ARCH} == "amd64"
.include "${LIBC_SRCTOP}/x86/gen/Makefile.inc"
.endif
.if ${MK_NIS} != "no"
CFLAGS+= -DYP
.include "${LIBC_SRCTOP}/yp/Makefile.inc"
.endif
.include "${LIBC_SRCTOP}/capability/Makefile.inc"
.if ${MK_HESIOD} != "no"
CFLAGS+= -DHESIOD
.endif
.if ${MK_FP_LIBC} == "no"
CFLAGS+= -DNO_FLOATING_POINT
.endif
.if ${MK_NS_CACHING} != "no"
CFLAGS+= -DNS_CACHING
.endif
.if defined(_FREEFALL_CONFIG)
CFLAGS+=-D_FREEFALL_CONFIG
.endif
STATICOBJS+=${LIBC_NONSHARED_SRCS:S/.c$/.o/}
VERSION_DEF=${LIBC_SRCTOP}/Versions.def
SYMBOL_MAPS=${SYM_MAPS}
# If there are no machine dependent sources, append all the
# machine-independent sources:
.if empty(MDSRCS) || ${MK_MACHDEP_OPTIMIZATIONS} == no
SRCS+= ${MISRCS}
.else
# Append machine-dependent sources, then append machine-independent sources
# for which there is no machine-dependent variant.
SRCS+= ${MDSRCS}
.for _src in ${MISRCS}
.if ${MDSRCS:R:M${_src:R}} == ""
SRCS+= ${_src}
.endif
.endfor
.endif
KQSRCS= adddi3.c anddi3.c ashldi3.c ashrdi3.c cmpdi2.c divdi3.c iordi3.c \
lshldi3.c lshrdi3.c moddi3.c muldi3.c negdi2.c notdi2.c qdivrem.c \
subdi3.c ucmpdi2.c udivdi3.c umoddi3.c xordi3.c
KSRCS= bcmp.c ffs.c ffsl.c fls.c flsl.c mcount.c strcat.c strchr.c \
strcmp.c strcpy.c strlen.c strncpy.c strrchr.c
libkern: libkern.gen libkern.${LIBC_ARCH}
libkern.gen: ${KQSRCS} ${KSRCS}
${CP} ${LIBC_SRCTOP}/quad/quad.h ${.ALLSRC} ${DESTDIR}/sys/libkern
libkern.${LIBC_ARCH}:: ${KMSRCS}
.if defined(KMSRCS) && !empty(KMSRCS)
${CP} ${.ALLSRC} ${DESTDIR}/sys/libkern/${LIBC_ARCH}
.endif
HAS_TESTS=
SUBDIR.${MK_TESTS}+= tests
.include <bsd.lib.mk>
.if (${LIBC_ARCH} == amd64 || ${LIBC_ARCH} == i386) && \
${.TARGETS:Mall} == all && \
defined(LINKER_FEATURES) && ${LINKER_FEATURES:Mifunc} == ""
.error ${LIBC_ARCH} libc requires linker ifunc support
.endif
.if !defined(_SKIP_BUILD)
# We need libutil.h, get it directly to avoid
# recording a build dependency
CFLAGS+= -I${SRCTOP}/lib/libutil
# Same issue with libm
MSUN_ARCH_SUBDIR != ${MAKE} -B -C ${SRCTOP}/lib/msun -V ARCH_SUBDIR
# unfortunately msun/src contains both private and public headers
CFLAGS+= -I${SRCTOP}/lib/msun/${MSUN_ARCH_SUBDIR}
.if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
CFLAGS+= -I${SRCTOP}/lib/msun/x86
.endif
CFLAGS+= -I${SRCTOP}/lib/msun/src
# and we do not want to record a dependency on msun
.if ${.MAKE.LEVEL} > 0
GENDIRDEPS_FILTER+= N${RELDIR:H}/msun
.endif
.endif
# Disable warnings in contributed sources.
CWARNFLAGS:= ${.IMPSRC:Ngdtoa_*.c:C/^.+$/${CWARNFLAGS}/:C/^$/-w/}
# Disable stack protection for SSP symbols.
SSP_CFLAGS:= ${.IMPSRC:N*/stack_protector.c:C/^.+$/${SSP_CFLAGS}/}
# Generate stack unwinding tables for cancellation points
CANCELPOINTS_CFLAGS:= ${.IMPSRC:Mcancelpoints_*:C/^.+$/${CANCELPOINTS_CFLAGS}/:C/^$//}
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