2b6ee34cf6
This is needed so that setting LD/XLD is not ignored when linking with $CC
instead of directly using $LD. Currently only clang accepts an absolute
path for -fuse-ld= (Clang 12+ will add a new --ld-path flag), so we now
warn when building with GCC and $LD != "ld" since that might result in the
wrong linker being used.
We have been setting XLD=/path/to/cheri/ld.lld in CheriBSD for a long time and
used a similar version of this patch to avoid linking with /usr/bin/ld.
This change is also required when building FreeBSD on an Ubuntu with Clang:
In that case we set XCC=/usr/lib/llvm-10/bin/clang and since
/usr/lib/llvm-10/bin/ does not contain a "ld" binary the build fails with
`clang: error: unable to execute command: Executable "ld" doesn't exist!`
unless we pass -fuse-ld=/usr/lib/llvm-10/bin/ld.lld.
This change passes -fuse-ld instead of copying ${XLD} to WOLRDTMP/bin/ld
since then we would have to ensure that this file does not exist while
building the bootstrap tools. The cross-linker might not be compatible with
the host linker (e.g. when building on macos: host-linker= Mach-O /usr/bin/ld,
cross-linker=LLVM ld.lld).
Reviewed By: brooks, emaste
Differential Revision: https://reviews.freebsd.org/D26055
63 lines
2.0 KiB
Makefile
63 lines
2.0 KiB
Makefile
# $FreeBSD$
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.PATH: ${SRCTOP}/sys/compat/linux ${SRCTOP}/sys/${MACHINE}/linux
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VDSO= linux_vdso
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KMOD= linux64
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SRCS= linux_fork.c linux_dummy.c linux_file.c linux_event.c \
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linux_futex.c linux_getcwd.c linux_ioctl.c linux_ipc.c \
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linux_machdep.c linux_misc.c linux_ptrace.c linux_signal.c \
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linux_socket.c linux_stats.c linux_sysctl.c linux_sysent.c \
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linux_sysvec.c linux_time.c linux_vdso.c linux_timer.c \
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opt_compat.h opt_inet6.h opt_posix.h opt_usb.h \
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vnode_if.h device_if.h bus_if.h \
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linux_support.s
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DPSRCS= assym.inc linux_genassym.c
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# XXX: for assym.inc
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SRCS+= opt_kstack_pages.h opt_nfs.h opt_hwpmc_hooks.h
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.if ${MACHINE_CPUARCH} == "i386"
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SRCS+= opt_apic.h
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.endif
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CLEANFILES= linux_assym.h linux_genassym.o linux_locore.o \
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genassym.o
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OBJS= ${VDSO}.so
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linux_assym.h: linux_genassym.o
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sh ${SYSDIR}/kern/genassym.sh linux_genassym.o > ${.TARGET}
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linux_locore.o: linux_locore.asm linux_assym.h
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${CC} ${CCLDFLAGS} -x assembler-with-cpp -DLOCORE -shared -mcmodel=small \
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-pipe -I. -I${SYSDIR} ${WERROR} -Wall -fno-common -fPIC -nostdinc \
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-Wl,-T${SRCTOP}/sys/${MACHINE}/linux/${VDSO}.lds.s \
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-Wl,-soname=${VDSO}.so.1,-warn-common -nostdlib \
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${.IMPSRC} -o ${.TARGET}
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.if ${MACHINE_CPUARCH} == "aarch64"
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OBJCOPY_TARGET=--output-target elf64-littleaarch64 --binary-architecture aarch64
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.elif ${MACHINE_CPUARCH} == "amd64"
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OBJCOPY_TARGET=--output-target elf64-x86-64 --binary-architecture i386:x86-64
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.else
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.error ${MACHINE_CPUARCH} not yet supported by linux64
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.endif
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${VDSO}.so: linux_locore.o
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${OBJCOPY} --input-target binary ${OBJCOPY_TARGET} -S -g \
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linux_locore.o ${.TARGET}
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${STRIPBIN} -N _binary_linux_locore_o_size ${.TARGET}
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linux_support.o: assym.inc linux_assym.h
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${CC} -c -x assembler-with-cpp -DLOCORE ${CFLAGS} \
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${.IMPSRC} -o ${.TARGET}
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linux_genassym.o: offset.inc
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${CC} -c ${CFLAGS:N-flto:N-fno-common} -fcommon ${.IMPSRC}
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.if !defined(KERNBUILDDIR)
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.warning Building Linuxulator outside of a kernel does not make sense
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.endif
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.include <bsd.kmod.mk>
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