Re: [PATCH 8/9] um: fix strrchr problems

[Al Viro]

On Mon, Aug 29, 2011 at 02:27:05PM -0700, Andrew Morton wrote:

> z:/usr/src/linux-3.1-rc4> grep -r kernel_strrchr .       
> z:/usr/src/linux-3.1-rc4> 
> 
> ok, I give up.  How does this work?

You are grepping for the wrong thing ;-)  It works the same way defines
next to it do - both the kernel and libc define functions with the
same name (doing the same thing) and we get problems when linking.

See the comment right before it:

# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
# named - it's a common symbol in libpcap, so we get a binary which crashes.
#
# Same things for in6addr_loopback and mktime - found in libc. For these two we
# only get link-time error, luckily.
#
# These apply to USER_CFLAGS to.

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