On Wed, Mar 15, 2017 at 05:50:00PM +0100, Arnd Bergmann wrote:
> I'm still build testing with an experimental change to enable
> thin architeves and --gc-sections on ARM, which should bring
> multiple benefits
>
> - improve build times
> - allow 'allyesconfig' to succeed without exceeding the
> section size when linking drivers/built-in.o
> - reduce the kernel image size
>
> However, I have now run into a build error binutils commit
> f02cb05 ("Always descend into output section statements in
> lang_do_assignments") in binutils-2.28 and later:
>
> no __ex_table in file: vmlinux
>
> Any idea what's going wrong here?
I presume you checked that section really had disappeared?
> __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
> __start___ex_table = .;
> #ifdef CONFIG_MMU
> - *(__ex_table)
> + KEEP(*(__ex_table))
> #endif
> __stop___ex_table = .;
> }
I think that if CONFIG_MMU is not defined, then ld will remove the
empty section.
--
Alan Modra
Australia Development Lab, IBM
