linux-kernel - Multiple longjmp definitions with STATIC

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Message-ID: <4999b293-42a6-bf88-ef0b-af5e0fc3729c@gmail.com>
Date:   Mon, 22 May 2017 20:28:01 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Richard Weinberger <richard@....at>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jdike@...toit.com, user-mode-linux-devel@...ts.sourceforge.net
Subject: Multiple longjmp definitions with STATIC_LINKING=y

Hi Richard,

I have been playing with UML again and trying to get it to statically
link on a CentOS 6.9 host that has:

glibc-2.12-static
gcc-4.4

installed results in the following:

/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
In function `siglongjmp':
(.text+0x8490): multiple definition of `longjmp'
arch/x86/um/built-in.o:/local/users/fainelli/openwrt/trunk/build_dir/target-x86_64_musl/linux-uml/linux-4.4.69/arch/x86/um/setjmp_64.S:44:
first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
In function `sem_open':
(.text+0x77cd): warning: the use of `mktemp' is dangerous, better use
`mkstemp'
collect2: ld returned 1 exit status
make[4]: *** [vmlinux] Error 1

Should we have some linker script magic not to export this symbol and
prevent a clash with libpthread.a pulling its own version?

Thanks!
-- 
Florian