Mailing-List: contact users-help@httpd.apache.org; run by ezmlm
Precedence: bulk
Reply-To: users@httpd.apache.org
From: "Dempsey, Richard C" <richard.dempsey@kodak.com>
To: "users@httpd.apache.org" <users@httpd.apache.org>
Thread-Topic: Undefined Symbol Prevents mod_proxy.so from Loading
Thread-Index: AdNJ1j47qa54V3o8ReyJQmtbpcS/yA==
Date: Fri, 20 Oct 2017 19:04:32 +0000
Message-ID: <CY4PR02MB3191B3E764E386AE7DF07E3EE5430@CY4PR02MB3191.namprd02.prod.outlook.com>
Accept-Language: en-US
Content-Language: en-US
received-spf: None (protection.outlook.com: kodak.com does not designate
 permitted sender hosts)
spamdiagnosticoutput: 1:99
spamdiagnosticmetadata: NSPM
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Oct 2017 19:04:32.8725
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 2c91ebe8-3a2f-434d-ab3e-dd3dc26da0ac
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR02MB3192
Subject: [users@httpd] Undefined Symbol Prevents mod_proxy.so from Loading
archived-at: Fri, 20 Oct 2017 19:04:48 -0000

I am building Apache 2.4.28 on RedHat Linux 2.6.32-573.el6.x86_64 for use a=
s a reverse proxy server, to upgrade from Apache 2.4.23. I am building with=
 APR 1.6.0 and APR-Util 1.6.2.

When I run apachectl configtest, I get the following message:

httpd: Syntax error on line 43 of /web/conf/httpd_main_proxy.conf: Syntax e=
rror on line 57 of /web/conf/extra/httpd-modules.conf: Cannot load modules/=
mod_proxy.so into server: /web/modules/mod_proxy.so: undefined symbol: ap_c=
heck_pipeline

And, indeed, nm -D confirms the ap_check_pipeline symbol is undefined:

$ nm -D ./httpd-2.4.28/modules/proxy/.libs/mod_proxy.so
                 w _Jv_RegisterClasses
000000000021d320 A __bss_start
                 U __ctype_b_loc
                 U __ctype_toupper_loc
                 w __cxa_finalize
                 U __errno_location
                 w __gmon_start__
000000000021d320 A _edata
000000000021d3c0 A _end
0000000000016268 T _fini
00000000000053b0 T _init
                 U ap_add_input_filter
                 U ap_bucket_error_create
                 U ap_check_cmd_context
                 U ap_check_pipeline
                 U ap_construct_url
                 U ap_create_per_dir_config
                 U ap_die
                 U ap_escape_html2
                 U ap_fflush
                 U ap_find_token
                 U ap_get_brigade
                 U ap_get_server_banner
                 U ap_get_server_name
                 U ap_get_server_port
                 U ap_get_token
[...]

My searches for ap_check_pipeline, both online and in the source, tell me t=
hat it's declared in ./httpd-2.4.28/modules/http/http_request.c, but little=
 else. Certainly, there is nothing about issues from the symbol being undef=
ined. In the output from configure and make, I see that http_request.c is c=
ompiled.

- Am I misinterpreting what AP_DECLARE means in the source?
- Where else should I look to find out why Apache wants the ap_check_pipeli=
ne to be defined?

Regards,

Rich

Rich Dempsey
eBusiness Analyst
WWIS CRM & Logistics
Eastman Kodak Company

richard.dempsey@kodak.com
=A0


---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org