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Merge of r1813767 from trunk.

mod_http2: avoid unnecessary data retrieval for a trace log. Allow certain
     information retrievals on null bucket beams where it makes sense.



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   - add some links and color highligh
   - remove some <var> (i.e. italic) around parameters that should be written unmodified (On|Off...)

r1813997 in trunk + some small modifications to synch with trunk

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+-   if ((forbidden & NOT_IN_DIR_CONTEXT) == NOT_IN_DIR_CONTEXT) {
++   if ((forbidden & NOT_IN_DIR_LOC_FILE) == NOT_IN_DIR_LOC_FILE) {
+        if (cmd->path != NULL) {
+            return apr_pstrcat(cmd->pool, cmd->cmd->name, gt,
+-                           " cannot occur within directory context", NULL);
++                           " cannot occur within <Directory/Location/Files/Proxy> "
++                           "section", NULL);
+        }
+        ...
+    }



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Fix maintainer mode with GCC/Clang.

Setting -Wstrict-prototypes in combination
with -Werror leads to compiler errors during
configure checks (autoconf generates incomplete
prototypes).

Adding -Wno-error=strict-prototypes lets the
compiler tolerate those.

Possible future enhancement: remember such
"configure time only" flags and remove them
from CFLAGS before generating our build time
files (Makefile, config_vars.mk etc.), so that
the full -Werror is in place during building.


Follow up to r1812263.

As suggested by Joe, add --maintainer/debugger-mode's CFLAGS in
NOTEST_CFLAGS to avoid interractions with autoconf's AC_LANG_PROGRAM.

APACHE_ADD_GCC_CFLAG now also forces -Wno-strict-prototypes for -Werror
to work despite AC_LANG_PROGRAM generating this warning by itself.


Submitted by: rjung, ylavic
Reviewed by: ylavic, rjung, jim


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make the current situation clearer.

I hope the new text is OK for Yann, otherwise I
could revert and add as my own comment.

i think r1812339 should be an integral part of
the mod_journald backport and currently we do not
have any obstacle for the configure.in proposal.
The ap_expr fix was already backported, the
mod_remoteip fix does not apply to the 2.4 code
and the mod_journald fix IMHO should be voted and
applied together with the pending mod_journald
backport.


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* The libnghttp2.pc might be found in lib64 on 64 bit systems
Submitted by: rpluem
Reviewed by: rpluem, icing, ylavic


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