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Re: Cannot compile m4 1.4.18 with clang 4.0

From: Eric Blake
Subject: Re: Cannot compile m4 1.4.18 with clang 4.0
Date: Tue, 25 Jul 2017 15:43:02 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

On 07/25/2017 03:06 PM, Thompson, KT wrote:
> As reported at https://github.com/LLNL/spack/issues/4883, there appears to be 
> a problem compiling m4 (version 1.4.18) on Linux with LLVM clang 4.0.  The 
> error is:
> ...
>   CC       m4.o
>   CC       builtin.o
>   CC       debug.o
>   CC       eval.o
>   CC       format.o
>   CC       freeze.o
>   CC       macro.o
>   CC       input.o
>   CC       output.o
>   CC       path.o
>   CC       symtab.o
>   CCLD     m4
> ../lib/libm4.a(xmalloc.o): In function `xnmalloc':
> .../m4-1.4.18/lib/xmalloc.c:(.text+0x71): undefined reference to `__muloti4'

That appears to be a bug in clang.

> Is there a known work around or patch to resolve this issue?  This same 
> version of m4 appears to compile w/o issue for several versions of gcc.

I don't know if the bug has already been fixed in gnulib (the provider
for xmalloc.c) - if so, then m4 will be fixed the next time we update to
newer gnulib and release an updated m4 (which may be sooner rather than
later, given that clang is a popular compiler, in spite of the fact that
although it is open source, it does not protect your freedoms like gcc).
 In the meantime, I'm adding gnulib in cc to see if this is a known issue.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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