On Fri, 9 Oct 2015 13:38:25 -0700 Jim Davis <jim.ep...@gmail.com> wrote:
> Building with the attached random configuration file,
>
> lib/built-in.o: In function `__bitrev32':
> deftree.c:(.text+0x1e799): undefined reference to `byte_rev_table'
> deftree.c:(.text+0x1e7a0): undefined reference to `byte_rev_table'
> deftree.c:(.text+0x1e7b4): undefined reference to `byte_rev_table'
> deftree.c:(.text+0x1e7c1): undefined reference to `byte_rev_table'
This is really irritating. We save 287 bytes in kernels which don't
use bitrev. It isn't worth the hassle, but let's keep plugging.
From: Andrew Morton <a...@linux-foundation.org>
Subject: lib/Kconfig: ZLIB_DEFLATE must select BITREVERSE
lib/built-in.o: In function `__bitrev32':
deftree.c:(.text+0x1e799): undefined reference to `byte_rev_table'
deftree.c:(.text+0x1e7a0): undefined reference to `byte_rev_table'
deftree.c:(.text+0x1e7b4): undefined reference to `byte_rev_table'
deftree.c:(.text+0x1e7c1): undefined reference to `byte_rev_table'
Anything which uses bitrevX() has to select BITREVERSE, to grab
lib/bitrev.o.
Reported-by: Jim Davis <jim.ep...@gmail.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
lib/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff -puN lib/Kconfig~lib-kconfig-zlib_deflate-must-select-bitreverse
lib/Kconfig
--- a/lib/Kconfig~lib-kconfig-zlib_deflate-must-select-bitreverse
+++ a/lib/Kconfig
@@ -220,6 +220,7 @@ config ZLIB_INFLATE
config ZLIB_DEFLATE
tristate
+ select BITREVERSE
config LZO_COMPRESS
tristate
_
--
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