On 2021-02-09 16:11 +0100, Viktor Engelmann wrote:
> Hello everyone,
>
> I'm building LFS 10.0 on a fully updated Manjaro Linux on an x86_64 for
> x86_64.
>
> When I compile M4 (chapter 6.2), I get two errors:
>
> - gcc complains about a void function ("fault_handler") being declared
> as "pure" in line 146 of m4.c
> - gcc complains about the flag -Wabi which is deprecated and doesn't do
> anything
>
> (see the attached log file)
>
> I was able to circumvent the problems by setting the environment variable
> CFLAGS=" -fpermissive -Wabi=11 " before ./configure, but I think that
> these are infact bugs
> in M4, so gcc is rightfully complaining.
>
> It seems that an older gcc version had failed if that function was NOT
> declared "pure"
> and the M4 team has also discussed this topic in july 2020, see
> https://lists.gnu.org/archive/cgi-bin/namazu.cgi?query=fault_handler&submit=Search%21&idxname=bug-m4&max=20&result=normal&sort=score
> they had also decided to make the function NOT "pure" (because
> fault_handler has sideeffects
> and should therefore not be pure). This was implemented by commit
> 74915227e245c2f93d0db1ff3c53544d8f594dfa in the m4 git repository, but
> the declaration
> is still present in the .tar.xz from 2016 on http://ftp.gnu.org/gnu/m4/
> that is used in LFS.
>
> I verified that LFS and LFS_TGT are set and that I'm compiling with
> x86_64-lfs-linux-gnu-gcc.
> Everything before M4 was built as regular user.
Those warnings should not be enabled by default.
Is your M4 tarball has the same MD5 checksum in the book? Or did you use some
configure options not mentioned by the book?
--
Xi Ruoyao <xry...@mengyan1223.wang>
School of Aerospace Science and Technology, Xidian University
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