[squid-users] squid 6.1 esi compile error, ubuntu 22.04

[Alex Rousskov]

On 8/8/23 01:10, Dmitry Melekhov wrote:
> 07.08.2023 17:27, Alex Rousskov пишет:
>> On 8/7/23 04:00, Dmitry Melekhov wrote:
>>
>>> Built  using --disable-esi without problems.
>>
>> First of all, if you do not need ESI, I recommend building with 
>> --disable-esi to avoid accidental exposure to dangerous ESI bugs in 
>> deployments that should not be using ESI features.

> Really, I know nothing about it, so most probably I don't need it.

Agreed.


>> FWIW, in Project CI environment that also uses GCC on Ubuntu 22.04, 
>> Squid v6.1 ESI build[1] succeeds, including the Libxml2Parser.cc 
>> compilation step that fails in your environment.
>>
>> [1] https://github.com/squid-cache/squid/actions/runs/5471818575
>>
>>     $ grep -A6 LIBEXPAT configure.log
>>     checking for LIBEXPAT... yes
>>     checking for expat.h... yes
>>     checking for LIBXML2... yes
>>     checking for libxml/parser.h... yes
>>     checking for libxml/HTMLparser.h... yes
>>     checking for libxml/HTMLtree.h... yes
>>     configure: Enabling ESI processor:  -lexpat -lm  -lxml2
>>
>>
>>     $ grep HAVE_LIBXML include/autoconf.h
>>     #define HAVE_LIBXML2 1
>>     #define HAVE_LIBXML_HTMLPARSER_H 1
>>     #define HAVE_LIBXML_HTMLTREE_H 1
>>     #define HAVE_LIBXML_PARSER_H 1
>>
>>
>> Can you share the corresponding ./configure output and 
>> include/autoconf.h lines from your build environment?
>>
>>
>>> Could you tell me what can cause this?
>>
>> I suspect your system lacks libxml/HTMLparser.h or Squid ./configure 
>> was unable to find that header. I cannot find relevant libxml2 
>> documentation, but if libxml promises to declare xmlParserCtxtPtr in 
>> libxml/HTMLparser.h, then this is a Squid bug: When that bug (if it is 
>> a Squid bug) is fixed, your build will fail at ./configure time 
>> instead of "make" time.
>>
>> Next steps:
>>
>> * If your system lacks libxml/HTMLparser.h, then install the missing 
>> libxml2 headers. Check the output sampled above to confirm that the 
>> installation led to header discovery by ./configure.
>>
>> * If your system has libxml/HTMLparser.h, set/adjust CPPFLAGS given to 
>> ./configure. Check the output sampled above to confirm that your 
>> adjustments led to header discovery by ./configure.



> It is in place, the same as in Ubuntu 20.04,  where I compiled squid 6.1 
> without problems,
> 
> but configure can't find it:
> 
> 
> configure:28616: checking for libxml/parser.h
> configure:28616: g++ -std=c++17 -c  -g -O2   conftest.cpp >&5
> conftest.cpp:120:10: fatal error: libxml/parser.h: No such file or 
> directory
>    120 | #include <libxml/parser.h>
>        |          ^~~~~~~~~~~~~~~~~
> compilation terminated.
> 
> 
> export CPPFLAGS=-I/usr/include/libxml2/
> 
> helps
> 
> now :
> 
> configure:28616: checking for libxml/parser.h
> configure:28616: g++ -std=c++17 -c  -g -O2 -I/usr/include/libxml2/ 
> conftest.cpp >&5
> configure:28616: $? = 0
> configure:28616: result: yes
> 
> 
> and squid is compiled.

> This is new install of ubuntu 22.04

Thank you for reporting these details! They may help others experiencing 
similar problems.

I cannot explain why setting CPPFLAGS is needed in your environment 
_but_ not needed in other very similar environments with libxml2 
installed. There might be some subtle differences in _how_ that library 
and its headers were installed, but I am just grasping at straws here.


Alex.