On Wed, Nov 18, 2015 at 3:12 PM, Lorenzo Colitti <lore...@google.com> wrote:
> On gcc Ubuntu 4.8.4-2ubuntu1~14.04, linking vmlinux fails with:
>
> arch/um/os-Linux/built-in.o: In function `os_timer_create':
> /android/kernel/android/arch/um/os-Linux/time.c:51: undefined reference to
> `timer_create'
> arch/um/os-Linux/built-in.o: In function `os_timer_set_interval':
> /android/kernel/android/arch/um/os-Linux/time.c:84: undefined reference to
> `timer_settime'
> arch/um/os-Linux/built-in.o: In function `os_timer_remain':
> /android/kernel/android/arch/um/os-Linux/time.c:109: undefined reference to
> `timer_gettime'
> arch/um/os-Linux/built-in.o: In function `os_timer_one_shot':
> /android/kernel/android/arch/um/os-Linux/time.c:132: undefined reference to
> `timer_settime'
> arch/um/os-Linux/built-in.o: In function `os_timer_disable':
> /android/kernel/android/arch/um/os-Linux/time.c:145: undefined reference to
> `timer_settime'
>
> This is because -lrt appears in the generated link commandline
> after arch/um/os-Linux/built-in.o. Fix this by removing -lrt from
> arch/um/Makefile and adding it to the UM-specific section of
> scripts/link-vmlinux.sh.
>
> Signed-off-by: Lorenzo Colitti <lore...@google.com>
> ---
> arch/um/Makefile | 2 +-
> scripts/link-vmlinux.sh | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/um/Makefile b/arch/um/Makefile
> index 25ed409..e3abe6f 100644
> --- a/arch/um/Makefile
> +++ b/arch/um/Makefile
> @@ -131,7 +131,7 @@ export LDS_ELF_FORMAT := $(ELF_FORMAT)
> # The wrappers will select whether using "malloc" or the kernel allocator.
> LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
>
> -LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt)) -lrt
> +LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
>
> # Used by link-vmlinux.sh which has special support for um link
> export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
> diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> index 1a10d8a..dacf71a 100755
> --- a/scripts/link-vmlinux.sh
> +++ b/scripts/link-vmlinux.sh
> @@ -62,7 +62,7 @@ vmlinux_link()
> -Wl,--start-group \
> ${KBUILD_VMLINUX_MAIN} \
> -Wl,--end-group \
> - -lutil ${1}
> + -lutil -lrt ${1}
> rm -f linux
> fi
> }
> --
Applied! :)
--
Thanks,
//richard
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