Messages in this thread | | | Date | Tue, 25 Sep 2007 11:49:44 +0200 | From | Henry Nestler <> | Subject | kbuild: LDFLAGS_MODULE unusable for external module builds (2.6.23-rc2) |
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In reference of git 114f51577724b782a30f4f5ceaee9880de93d776: > kbuild: use LDFLAGS_MODULE only for .ko links > > Sam Ravnborg pointed out that Documentation/kbuild/makefiles.txt already > says this is what it's for. This patch makes the reality live up to the > documentation. This fixes the problem of LDFLAGS_BUILD_ID getting into too > many places.
LDFLAGS_MODULE is not usable in module build out of kernel tree since 2.6.23-rc2. LDFLAGS_$@ should use, but does never work. - Not for external module builds with the option "M=..."
What macro should set for linker parameters of foo.o ? I'm not shure. Currently found, that only LDFLAGS is usable. But, found LDFLAGS in modpost calls, there also exist a --start-group/--end-group. Is it right to use it for external module?
Here examples and the outputs. Host and target is an i686 SMP Linux.
mkdir /tmp/test; cd /tmp/test cat >Makefile <<EOF obj-m := name.o name-objs := foo.o # Use multipe defines, hope any would work LDFLAGS_MODULE += --start-group LDFLAGS_name += --start-group LDFLAGS_name.o += --start-group EOF
cat >foo.c <<EOF #include <linux/module.h> #include <linux/init.h> int init_module(void) {return 0;} void cleanup_module(void) {return;} EOF
#2.6.22 works. LDFLAGS_MODULE was used: make V=1 -C src/linux-2.6.22 M=$PWD | grep " ld " ld -m elf_i386 -m elf_i386 -r --start-group -o /tmp/name.o /tmp/foo.o ld -m elf_i386 -m elf_i386 -r -o /tmp/name.ko /tmp/name.o /tmp/name.mod.o
#2.6.23-rc7 does not work. Nothing from LDFLAGS can seen in linker line: make V=1 -C src/linux-2.6.23-rc7 M=$PWD | grep " ld " ld -m elf_i386 -m elf_i386 -r -o /tmp/name.o /tmp/foo.o ld -m elf_i386 -r -m elf_i386 -o /tmp/name.ko /tmp/name.o /tmp/name.mod.o
------ Perhaps anybody can give better idea for Makefile with recursive depens of libraries? What I'm missing, is a setup for --start-group AND the --end-group arrount the lib.a files. Currently --start-groups is somether before the first object and has no --end-group.
obj-y := dir1/ dir2/ dir3/ obj-m := name.ko name-objs = foo.o dir1/lib.a dir2/lib.a dir3/lib.a LDFLAGS += --start-group # Deal with recursive depens of libraries
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