dovecot - Aug 2021 - Timo - is the v2.3.15 GCC limitation really necessarily or it's just a bug?

Hi,

Update:

1) Centos 5 and 6, compiled GCC 4.8.5 and successfully built Dovecot v2.3.15.

2) RedHat based customized build, first compiled GCC 4.7.4 and with it compiled
GCC 4.8.5, then added --disable-hardening to options, got new error:

In file included from /usr/include/sys/wait.h:79:0,
                 from db-checkpassword.c:21:
db-checkpassword.c: In function 'sigchld_handler':
db-checkpassword.c:426:6: error: assignment of read-only member '__in'
  if (WIFSIGNALED(status->status)) {
      ^
...

As Docvecot does not support INC_PATH= and ignores --includedir= option, I
replaced the /usr/include/sys/wait.h file from the newer glibc-headers package
and successfully built Dovecot v2.3.15.


Old text:

Compiled GCC 4.7.4 with options:
--enable-languages=c,c++ --disable-multilib

Compiled Dovecot v2.3.15 wih options:
export CC=/usr/local/gcc-4.7.4/bin/gcc
export CXX=/usr/local/gcc-4.7.4/bin/g++

./configure --prefix=/usr --with-ssl=openssl --with-ssldir=/etc/ssl
--sysconfdir=/etc --with-pam --without-bsdauth --without-sql --without-nss
--without-ldap --without-pgsql --without-mysql --without-sqlite
--with-rundir=/var/run/dovecot --without-cassandra --without-lucene
--without-solr --without-textcat --without-libcap --without-stemmer
--disable-rpath --disable-dependency-tracking --disable-silent-rules
--without-gssapi --without-cdb

Got error:
configure: error: fd passing is required for Dovecot to work

Added --disable-hardening and got further, but then with GCC 4.7.4, now I'm
getting same old error, which I first got 4 years ago with version v2.2.30 and
which Timo fixed - https://dovecot.org/list/dovecot/2017-June/108418.html

db-checkpassword.c: In function 'sigchld_handler':
db-checkpassword.c:426:6: error: assignment of read-only member '__in'
db-checkpassword.c:427:3: error: assignment of read-only member '__in'
db-checkpassword.c:431:13: error: assignment of read-only member '__in'
db-checkpassword.c:432:26: error: assignment of read-only member '__in'
make[3]: *** [db-checkpassword.lo] Error 1

Due GCC segmentation faults during compilation, so far I'm unable to compile
any newer GCC, but got also same result with GCC 4.6.4.

Please advise?


Mart

Timo Sirainen wrote:
> On 29. Jul 2021, at 7.21, Mart Pirita <mart at e-positive.ee
<mailto:mart at e-positive.ee>> wrote:
>>
>> Hello.
>>
>> So far I have successfully built Dovecot until v2.3.14 on Centos 4-6
(yes I know, they are old, but as they are remote servers, distros can't
upgraded), and sometimes I have also met compilation issues, but after
highlighting them, Timo have fixed the code.
>>
>> Found from similar thread (Dovecot 2.3.15 compilation fails
https://dovecot.org/list/dovecot/2021-June/122412.html ) that new GCC is needed.
However I can't find such requirement in v2.3.15 change log.
> 
> Looks like we forgot to mention that.
> 
>> As seems that I'm not the only one with compilation issues, then
@Timo - can You please fix the code so that also v2.3.15 can compiled on older
distros?
> 
> Sorry, it's no longer possible. The buffer.h API had to be changed to
fix some real bugs:
https://github.com/dovecot/core/commit/1d9b4e14008b15b7a34b5c633b09b9670e866256
> 
> The original way I changed it would have made the code more complex and it
was also a huge change. The final method was much simpler, but it requires now
compiler support for anonymous unions and anonymous structs, i.e. C11. Although
some older GCCs should also support it, but I guess you've a too old
version.
>

On Sun, 2021-08-01 at 21:53 +0300, Mart Pirita wrote:
> 
> As Docvecot does not support INC_PATH= and ignores --includedir= option, 
You can try CPPFLAGS="-I<path>" in the future. I don't know
how a
normal person would ever figure it out, but that's the "correct"
way to
include headers from a non-default directory.