mod_cache_socache: New cache implementation backed by mod_socache that replaces mod_mem_cache removed from httpd v2.2.

Spin off module-specific build options into separate build vars. [second try, supersedes r1385214] Add MOD_CFLAGS, MOD_LDFLAGS variables etc. to the build commands, which are available to modules for customization on a per-subdir basis (by adding definitions to modules.mk). Reduces the risk of side-effects when a module needs to add CFLAGS, LDFLAGS etc. and these would be added to the global settings (ALL_CFLAGS etc.). Adapt build settings for mod_ssl, mod_socache_dc, mod_deflate, mod_xml2enc, mod_proxy_html, and mod_lua to use the new MOD_xxx build variables. Change PICFLAGS, SHLTCFLAGS and LTCFLAGS into config vars, instead of AC_SUBSTing them in build/rules.mk.in. For support/ab, introduce ab_CFLAGS and ab_LDFLAGS, and define explicit make targets where they appear at the proper position in the build commands. Consistently use "--with-xxx=PATH" in configure help strings which are used to specify a path to the installation directory of an auxiliary package.

revert r1385214, as I inadvertently left out acinclude.m4.

Spin off module-specific build options into separate build vars. Add MOD_CFLAGS, MOD_LDFLAGS variables etc. to the build commands, which are available to modules for customization on a per-subdir basis (by adding definitions to modules.mk). Reduces the risk of side-effects when a module needs to add CFLAGS, LDFLAGS etc. and these would be added to the global settings (ALL_CFLAGS etc.). Adapt build settings for mod_ssl, mod_socache_dc, mod_deflate, mod_xml2enc, mod_proxy_html, and mod_lua to use the new MOD_xxx build variables. Change PICFLAGS, SHLTCFLAGS and LTCFLAGS into config vars, instead of AC_SUBSTing them in build/rules.mk.in. For support/ab, introduce ab_CFLAGS and ab_LDFLAGS, and define explicit make targets where they appear at the proper position in the build commands. Consistently use "--with-xxx=PATH" in configure help strings which are used to specify a path to the installation directory of an auxiliary package.

More configure time dependencies: mod_cache_disk depends on mod_cache mod_heartbeat depends on mod_watchdog

Tolerate dependency checking failures in configure for modules that have been enabled only implicitely.

1) Add --with-distcache to configure for choosing the distcache installation directory. 2) Use correct build variable MOD_SOCACHE_DC_LDADD instead of MOD_SOCACHE_LDADD in build macro. Also made the macro a bit more consistent with the SSL checking macro.

mod_disk_cache renamed to mod_cache_disk, to be consistent with the naming of other modules.

Add to modules' help text (displayed by ./configure -h) more information that will be useful in deciding whether to enable them or not.

OS/2: Fix building of more modules that depend on symbols from other modules. Affected modules are: mod_heartbeat, mod_session_cookie, mod_session_crypto, mod_session_dbd and mod_disk_cache.

- Add reallyall option to configure to build everything that can be built with the available libs. - Remove redundant --with-distcache option. Simply enable distcache if mod_socache_dc is selected. - Enable serf support by default if serf is available in /usr.

* mod_mem_cache is dead. So remove all hints on it.

mod_mem_cache consumes mod_cache, linking this in two modules is an error.

Revert prior commit; the flaw is not in exporting all of these cache_* functions, but in declaring them exported in the first place. _hash, _pqueue and cache_cache are undecorated and were erroniously exported.

These are declared CACHE_DECLARE and should be consumed from mod_cache by mod_mem_cache. The duplicate cache_util import is a dead giveaway that this was broken. In order to backport, an MMN bump would be required because these cache_pqueue, cache_cache and cache_hash exported functions would be added to the "contract" of functions which are available from mod_cache for third party cache providers.

Fix socache modules' APACHE_MODULE() definitions.

Session cache interface redesign, Part 8: Abstract out the mod_ssl session caching interface into a separate set of modules, mod_socache_*. * modules/cache/ap_socache.h: New file. * modules/cache/config.m4: Copy CHECK_DISTCACHE from ../ssl/config.m4; add new socache modules. * modules/cache/mod_socache_dbm.c: Copied from ../ssl/ssl_scache_dbm.c. s/ssl_scache_/socache_/; add module structure and register_hooks. * modules/cache/mod_socache_shmcb.c: Copied from ../ssl/ssl_scache_shmcb.c. s/ssl_scache_/socache_/; add module structure and register_hooks. Add SHMCB_MAX_SIZE definition, replacing APR_SHM_MAXSIZE. * modules/cache/mod_socache_memcache.c: Copied from ../ssl/ssl_scache_memcache.c. s/ssl_scache_/socache_/; add module structure and register_hooks. Enable for APR-Util 1.3.x at compile-time, omitting configure-time checks. * modules/cache/mod_socache_dc.c: Copied from ../ssl/ssl_scache_dc.c. s/ssl_scache_/socache_/; add module structure and register_hooks.

Turn the cache module into first class citizens (well the disk_cache and file cache that is). This makes the delta between 'all' and 'most' mod_cern_meta.c mod_log_forensic.c mod_mime_magic.c mod_unique_id.c mod_usertrack.c mod_version.c mod_mem_cache.c And keeps disabled in all and most the modules for: authnz_ldap bucketeer echo example_hooks case_filter case_filter_in example_ipc charset_lite cgid ldap optional_hook_export optional_hook_import optional_fn_import optional_fn_export As well as mod_ssl which is intentionally not part of MOST and All.

At long last, promote mod_cache and friends out of experimental/. Also, take quick pass through docs files to remove experimental label for them. Reviewed by: Paul Querna, Bill Stoddard, Justin Erenkrantz

Use -export-dynamic only when linking an httpd which includes mod_so, not when linking modules or support programs. * modules/aaa/config.m4, modules/arch/win32/config.m4, modules/cache/config.m4, modules/echo/config.m4, modules/filters/config.m4, modules/generators/config5.m4, modules/metadata/config.m4: Don't add -export-dynamic to LT_LDFLAGS. * modules/mappers/config9.m4: Add -export-dynamic to HTTPD_LDFLAGS when mod_so is enabled.

Fix httpd's definition of LTFLAGS to be consistent with that of apr and apr-util, allow it to be overridden by the configure command-line (default="--silent") and introduce LT_LDFLAGS to replace what we were formally abusing as LTFLAGS.

Completely revamp configure so that it preserves the standard make variables CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS and LIBS by moving the configure additions to EXTRA_* variables. Also, allow the user to specify NOTEST_* values for all of the above, which eliminates the need for THREAD_CPPFLAGS, THREAD_CFLAGS, and OPTIM. Fix the setting of INCLUDES and EXTRA_INCLUDES. Check flags as they are added to avoid pointless duplications. Fix the order in which flags are given on the compile and link lines.

*) remove STANDARD_LIBS line; it is unused/unneeded *) simplify by removing the extra AC_DEFUN() in each file

Get the modules configuration stuff working correctly. This just deals with STANDARD modules and Protocol, not MPMs.

Start to add back the config.m4 and Makefile.in's that were separated out during the repository move.