# link vmlinux
#
# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
-# $(KBUILD_VMLINUX_MAIN). Most are built-in.o files from top-level directories
-# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
-# Ordering when linking is important, and $(KBUILD_VMLINUX_INIT) must be first.
+# $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.o files
+# from top-level directories in the kernel tree, others are specified in
+# arch/$(ARCH)/Makefile. Ordering when linking is important, and
+# $(KBUILD_VMLINUX_INIT) must be first. $(KBUILD_VMLINUX_LIBS) are archives
+# which are linked conditionally (not within --whole-archive), and do not
+# require symbol indexes added.
#
# vmlinux
# ^
# +--< $(KBUILD_VMLINUX_MAIN)
# | +--< drivers/built-in.o mm/built-in.o + more
# |
+# +--< $(KBUILD_VMLINUX_LIBS)
+# | +--< lib/lib.a + more
+# |
# +-< ${kallsymso} (see description in KALLSYMS section)
#
# vmlinux version (uname -v) cannot be updated during normal
fi
}
+# Thin archive build here makes a final archive with symbol table and indexes
+# from vmlinux objects INIT and MAIN, which can be used as input to linker.
+# KBUILD_VMLINUX_LIBS archives should already have symbol table and indexes
+# added.
+#
+# Traditional incremental style of link does not require this step
+#
+# built-in.o output file
+#
+archive_builtin()
+{
+ if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
+ info AR built-in.o
+ rm -f built-in.o;
+ ${AR} rcsTP${KBUILD_ARFLAGS} built-in.o \
+ ${KBUILD_VMLINUX_INIT} \
+ ${KBUILD_VMLINUX_MAIN}
+ fi
+}
+
# Link of vmlinux.o used for section mismatch analysis
# ${1} output file
modpost_link()
{
- ${LD} ${LDFLAGS} -r -o ${1} ${KBUILD_VMLINUX_INIT} \
- --start-group ${KBUILD_VMLINUX_MAIN} --end-group
+ local objects
+
+ if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
+ objects="--whole-archive \
+ built-in.o \
+ --no-whole-archive \
+ --start-group \
+ ${KBUILD_VMLINUX_LIBS} \
+ --end-group"
+ else
+ objects="${KBUILD_VMLINUX_INIT} \
+ --start-group \
+ ${KBUILD_VMLINUX_MAIN} \
+ ${KBUILD_VMLINUX_LIBS} \
+ --end-group"
+ fi
+ ${LD} ${LDFLAGS} -r -o ${1} ${objects}
}
# Link of vmlinux
vmlinux_link()
{
local lds="${objtree}/${KBUILD_LDS}"
+ local objects
if [ "${SRCARCH}" != "um" ]; then
- ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
- -T ${lds} ${KBUILD_VMLINUX_INIT} \
- --start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}
+ if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
+ objects="--whole-archive \
+ built-in.o \
+ --no-whole-archive \
+ --start-group \
+ ${KBUILD_VMLINUX_LIBS} \
+ --end-group \
+ ${1}"
+ else
+ objects="${KBUILD_VMLINUX_INIT} \
+ --start-group \
+ ${KBUILD_VMLINUX_MAIN} \
+ ${KBUILD_VMLINUX_LIBS} \
+ --end-group \
+ ${1}"
+ fi
+
+ ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
+ -T ${lds} ${objects}
else
- ${CC} ${CFLAGS_vmlinux} -o ${2} \
- -Wl,-T,${lds} ${KBUILD_VMLINUX_INIT} \
- -Wl,--start-group \
- ${KBUILD_VMLINUX_MAIN} \
- -Wl,--end-group \
- -lutil -lrt -lpthread ${1}
+ if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
+ objects="-Wl,--whole-archive \
+ built-in.o \
+ -Wl,--no-whole-archive \
+ -Wl,--start-group \
+ ${KBUILD_VMLINUX_LIBS} \
+ -Wl,--end-group \
+ ${1}"
+ else
+ objects="${KBUILD_VMLINUX_INIT} \
+ -Wl,--start-group \
+ ${KBUILD_VMLINUX_MAIN} \
+ ${KBUILD_VMLINUX_LIBS} \
+ -Wl,--end-group \
+ ${1}"
+ fi
+
+ ${CC} ${CFLAGS_vmlinux} -o ${2} \
+ -Wl,-T,${lds} \
+ ${objects} \
+ -lutil -lrt -lpthread
rm -f linux
fi
}
rm -f .tmp_kallsyms*
rm -f .tmp_version
rm -f .tmp_vmlinux*
+ rm -f built-in.o
rm -f System.map
rm -f vmlinux
rm -f vmlinux.o
. "./${KCONFIG_CONFIG}"
esac
-#link vmlinux.o
-info LD vmlinux.o
-modpost_link vmlinux.o
-
-# modpost vmlinux.o to check for section mismatches
-${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
-
# Update version
info GEN .version
if [ ! -r .version ]; then
# final build of init/
${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
+archive_builtin
+
+#link vmlinux.o
+info LD vmlinux.o
+modpost_link vmlinux.o
+
+# modpost vmlinux.o to check for section mismatches
+${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
+
kallsymso=""
kallsyms_vmlinux=""
if [ -n "${CONFIG_KALLSYMS}" ]; then