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From Eric Covener <cove...@gmail.com>
Subject Re: Reference to core request fails during compile
Date Sun, 27 Jan 2019 19:52:07 GMT
On Sat, Jan 26, 2019 at 6:46 PM miim <xxdpplus@yahoo.com.invalid> wrote:
>
> I have undefined reference errors in an Apache module.  I've cut the source code down
to a minimum that reproduces the error. Below is the source for "mod_test.c" ...
>
> ----------------------------------------------------------------------------
> #include "httpd.h"
> #include "http_config.h"
> #include "http_request.h"
> #include "http_protocol.h"
> #include "http_core.h"
> #include "http_main.h"
> #include "http_log.h"
> #include "ap_mpm.h"
> #include "apr_strings.h"
> #include <stdio.h>
> #include <stdlib.h>
> #include <errno.h>
> #include <string.h>
> #include <sys/types.h>
> #include <arpa/inet.h>
> #include <netdb.h>
>
> module AP_MODULE_DECLARE_DATA test_module;
>
> static int test_handler(request_rec *r);
> static int test_init(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s);
>
> /* Structure containing state information for the module */
>
> typedef struct {
> } ns_mod_config;
>
>
> static int ns_typematch(request_rec *r) {
>
>   ns_mod_config *ns_scfg = ap_get_module_config(r->server->module_config,
>                                           &test_module);
>
>   core_request_config *creq_cfg;
>   creq_cfg = ap_get_core_module_config(r->request_config);
>
>   return 0;
> }
>
> module AP_MODULE_DECLARE_DATA test_module = {
>         STANDARD20_MODULE_STUFF,NULL,NULL,NULL,NULL,NULL,NULL};
> ----------------------------------------------------------------------------
>
> I am using a more-or-less standard Makefile for compiling the module (note that the install
option has been removed as this is a test to demonstrate the problem.)
>
> ----------------------------------------------------------------------------
> APXS=/usr/local/apache2/bin/apxs
> APXS_OPTS=-Wc, -Wc,-DDST_CLASS=3
> SRC=src/mod_test.c
> OBJ=src/.libs/mod_test.so
>
> $(OBJ): $(SRC)
>         @echo
>         $(APXS) $(APXS_OPTS) -c $(SRC)
>         @echo
>         @echo write '"make install"' to install module
>         @echo
>
> clean:
>         rm -f src/.libs/*
>         rm -f src/*.o
>         rm -f src/*.lo
>         rm -f src/*.la
>         rm -f src/*.slo
>         rmdir src/.libs
> ----------------------------------------------------------------------------
>
> The compile fails as follows:
>
> ----------------------------------------------------------------------------
> /usr/local/apache2/bin/apxs -Wc, -Wc,-DDST_CLASS=3 -c src/mod_test.c
> /usr/local/apache2/build/libtool --silent --mode=compile gcc -prefer-pic   -DLINUX -D_REENTRANT
-D_GNU_SOURCE -D_LARGEFILE64_SOURCE -g -O2 -pthread -I/usr/local/apache2/include  -I/usr/local/apache2/include
  -I/usr/local/apache2/include   -DDST_CLASS=3  -c -o src/mod_test.lo src/mod_test.c &&
touch src/mod_test.slo
> src/mod_test.c: In function âns_typematchâ:
> src/mod_test.c:34:3: error: unknown type name âcore_request_configâ
>    core_request_config *creq_cfg;
>    ^~~~~~~~~~~~~~~~~~~
> src/mod_test.c:35:14: warning: implicit declaration of function âap_get_core_module_configâ
[-Wimplicit-function-declaration]
>    creq_cfg = ap_get_core_module_config(r->request_config);


is /usr/local/apache2 Apache 2.2.x instead of 2.4.x?

2.2 is far past end of support, but:
 - 2.2 required modules to define CORE_PRIVATE before seeing this structure.
 - 2.2 also has no ap_get_core_module_config so you can't use that
2.4-ism (this is actually the 2nd error quoted above)

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