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9bfd3b4076
In the future, we will Default to _FORTIFY_SOURCE=2 if SSP is enabled, otherwise default to _FORTIFY_SOURCE=0. For now we default it to 0 unconditionally to ease bisect across older versions without the new symbols, and we'll put out a call for testing. include/*.h include their ssp/*.h equivalents as needed based on the knob. Programs and users are allowed to override FORTIFY_SOURCE in their Makefiles or src.conf/make.conf to force it off. Reviewed by: des, markj Relnotes: yes Sponsored by: Stormshield Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D32308
132 lines
3.3 KiB
Makefile
132 lines
3.3 KiB
Makefile
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# Use the following command to build local debug version of dynamic
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# linker:
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# make DEBUG_FLAGS=-g WITHOUT_TESTS=yes all
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RTLD_ELF_DIR:= ${.PARSEDIR}
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.include <src.opts.mk>
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PACKAGE= clibs
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MK_PIE= no # Always position independent using local rules
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# Not compatible with sanitizer instrumentation or SSP.
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MK_ASAN= no
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MK_SSP= no
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MK_UBSAN= no
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.include <bsd.compat.pre.mk>
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# SSP forced off already implies FORTIFY_SOURCE=0, but we must make sure that
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# one cannot turn it back on.
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FORTIFY_SOURCE= 0
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.if !defined(NEED_COMPAT)
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CONFS= libmap.conf
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.endif
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PROG?= ld-elf.so.1
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.for _libcompat in ${_ALL_libcompats}
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.if ${PROG:M*ld-elf${_libcompat}[-.]*} != ""
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TAGS+= lib${_libcompat}
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.endif
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.endfor
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SRCS= \
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crtbrand.S \
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rtld_start.S \
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reloc.c \
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rtld.c \
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rtld_lock.c \
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rtld_malloc.c \
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rtld_printf.c \
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map_object.c \
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xmalloc.c \
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debug.c \
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libmap.c
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MAN?= rtld.1
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ACFLAGS+= -DLOCORE
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CFLAGS+= -Wall -DIN_RTLD -ffreestanding
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CFLAGS+= -I${SRCTOP}/lib/csu/common
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.if exists(${RTLD_ELF_DIR}/${MACHINE_ARCH:S/powerpc64le/powerpc64/})
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RTLD_ARCH= ${MACHINE_ARCH:S/powerpc64le/powerpc64/}
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.else
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RTLD_ARCH= ${MACHINE_CPUARCH}
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.endif
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CFLAGS+= -I${RTLD_ELF_DIR}/${RTLD_ARCH} -I${RTLD_ELF_DIR}
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NO_WCAST_ALIGN= yes
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INSTALLFLAGS= -C -b
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PRECIOUSPROG=
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BINDIR= /libexec
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SYMLINKS= ../..${BINDIR}/${PROG} ${LIBEXECDIR}/${PROG}
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MLINKS?= rtld.1 ld-elf.so.1.1 \
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rtld.1 ld.so.1
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CFLAGS+= -fpic -DPIC $(DEBUG)
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LDFLAGS+= -shared -Wl,-Bsymbolic -Wl,-z,defs -nostdlib -e ${RTLD_ENTRY}
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# Pull in the dependencies that we use from libc
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.include "rtld-libc/Makefile.inc"
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VERSION_DEF= ${LIBCSRCDIR}/Versions.def
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SYMBOL_MAPS= ${RTLD_ELF_DIR}/Symbol.map
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VERSION_MAP= Version.map
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LDFLAGS+= -Wl,--version-script=${VERSION_MAP}
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.if exists(${RTLD_ELF_DIR}/${RTLD_ARCH}/Symbol.map)
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SYMBOL_MAPS+= ${RTLD_ELF_DIR}/${RTLD_ARCH}/Symbol.map
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.endif
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.sinclude "${RTLD_ELF_DIR}/${RTLD_ARCH}/Makefile.inc"
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RTLD_ENTRY?= .rtld_start
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# Always produce the map file so that may be inspected to confirm
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# undesired code is not linked from libsys/libc.
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MAPFILE= ld-elf.so.1.map
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LDFLAGS+= -Wl,-Map=${MAPFILE} -Wl,--cref
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CLEANFILES+= ${MAPFILE}
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afterbuild:
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@if grep __libsys_interposing ${MAPFILE} >/dev/null ; then \
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echo "libsys_interposing leaked" 1>&2 ; \
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exit 1 ; \
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fi
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@if grep __libc_interposing ${MAPFILE} >/dev/null ; then \
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echo "libc_interposing leaked" 1>&2 ; \
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exit 1 ; \
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fi
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@if grep xlocale ${MAPFILE} >/dev/null ; then \
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echo "xlocale leaked" 1>&2 ; \
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exit 1 ; \
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fi
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@if grep fprintf ${MAPFILE} >/dev/null ; then \
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echo "stdio leaked" 1>&2 ; \
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exit 1 ; \
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fi
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# Since moving rtld-elf to /libexec, we need to create a symlink.
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# Fixup the existing binary that's there so we can symlink over it.
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beforeinstall:
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.if exists(${DESTDIR}/usr/libexec/${PROG}) && ${MK_STAGING} == "no"
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-chflags -h noschg ${DESTDIR}/usr/libexec/${PROG}
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.endif
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.PATH: ${RTLD_ELF_DIR}/${RTLD_ARCH} ${SRCTOP}/lib/csu/common
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.if ${.CURDIR} == ${RTLD_ELF_DIR}
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HAS_TESTS=
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SUBDIR.${MK_TESTS}+= tests
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.endif
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# Some of the required math functions (div & mod) are implemented in
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# libcompiler_rt on some architectures.
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LIBADD+= compiler_rt
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.include <bsd.prog.mk>
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${PROG_FULL}: ${VERSION_MAP}
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.include <bsd.symver.mk>
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.if ${COMPILER_TYPE} == "gcc"
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# GCC warns about redeclarations even though they have __exported
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# and are therefore not identical to the ones from the system headers.
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CFLAGS+= -Wno-redundant-decls
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.endif
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