configure: use the threaded resolver backend by default if possible

Closes #1647

configure: stop prepending to LDFLAGS, CPPFLAGS

- Change prepends to appends because user's LDFLAGS and CPPFLAGS should
always come first so they're searched before ours.

Bug:

configure: stop prepending to LDFLAGS, CPPFLAGS

- Change prepends to appends because user's LDFLAGS and CPPFLAGS should
always come first so they're searched before ours.

Bug: https://github.com/curl/curl/issues/1420
Reported-by: Helmut K. C. Tessarek

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configure: fix for --enable-pthreads

Better handle options conflicts that can occur if --enable-pthreads.

Bug: https://github.com/curl/curl/pull/1295
Reported-by: Marc-Antoine P

configure: fix for --enable-pthreads

Better handle options conflicts that can occur if --enable-pthreads.

Bug: https://github.com/curl/curl/pull/1295
Reported-by: Marc-Antoine Perennou

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configure: ac_cv_ -> curl_cv_ for r/w vars

These configure vars are modified in a curl-specific way and modified by
the configure process, but are never loaded from cache, even though th

configure: ac_cv_ -> curl_cv_ for r/w vars

These configure vars are modified in a curl-specific way and modified by
the configure process, but are never loaded from cache, even though they
are designated as _cv_. We should implement proper AC_CACHE_CHECKs for
them eventually.

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configure: ac_cv_ -> curl_cv_ for all cached vars

This was automated by:

sed -b -i -f <(ack -A1 AC_CACHE_CHECK | \
ack -o 'ac_cv_.*?\b' | \
sor

configure: ac_cv_ -> curl_cv_ for all cached vars

This was automated by:

sed -b -i -f <(ack -A1 AC_CACHE_CHECK | \
ack -o 'ac_cv_.*?\b' | \
sort -u | xargs -n1 bash -c \
'echo "s/$0/curl_cv_${0#ac_cv_}/g"') \
$(git ls-files)

This only changed the prefix for 16 variables actually checked with
AC_CACHE_CHECK.

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URLs: change all http:// URLs to https://

curl-confopts.m4: Add missing ')'

... for CURL_CHECK_OPTION_RT

Closes #456

configure: add --disable-rt option

This option disables any attempts in configure to create dependency on
stuff requiring linking to librt.so and libpthread.so, in this case this
mea

configure: add --disable-rt option

This option disables any attempts in configure to create dependency on
stuff requiring linking to librt.so and libpthread.so, in this case this
means clock_gettime(CLOCK_MONOTONIC, &mt).

We were in need to build curl which doesn't link libpthread.so to avoid
the following bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=16628.

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configure: autotools compatibility fixes - step I

Fix proper macro expansion order across autotools versions for
C compiler and preprocessor program checks.

configure: remove the --enable/disable-nonblocking options

Removing this option as it currently only functions to lure people into
wrongly using it and falsely believing that libcurl wil

configure: remove the --enable/disable-nonblocking options

Removing this option as it currently only functions to lure people into
wrongly using it and falsely believing that libcurl will work fine
without using nonblocking sockets internally - which leads to hard to
track or understand errors.

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build adjustments: commit 9e24b9c7 follow-up

build adjustments: CURL_HIDDEN_SYMBOLS no longer defined in config files

configure script now provides conditional definitions for Makefile.am
that result in CURL_HIDDEN_SYMBOLS being de

build adjustments: CURL_HIDDEN_SYMBOLS no longer defined in config files

configure script now provides conditional definitions for Makefile.am
that result in CURL_HIDDEN_SYMBOLS being defined by resulting makefiles
when appropriate.

Additionally, configure script option for symbol hiding control is now
named --enable-symbol-hiding --disable-symbol-hiding. While still valid,
old option name --enable-hidden-symbols --disable-hidden-symbols will
be deprecated in some future release.

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NTLM_WB: final congruency naming adjustments

Configure script option --enable-wb-ntlm-auth renamed to --enable-ntlm-wb
Configure script option --disable-wb-ntlm-auth renamed to --disable

NTLM_WB: final congruency naming adjustments

Configure script option --enable-wb-ntlm-auth renamed to --enable-ntlm-wb
Configure script option --disable-wb-ntlm-auth renamed to --disable-ntlm-wb

Preprocessor symbol WINBIND_NTLM_AUTH_ENABLED renamed to NTLM_WB_ENABLED
Preprocessor symbol WINBIND_NTLM_AUTH_FILE renamed to NTLM_WB_FILE

Test harness env var CURL_NTLM_AUTH renamed to CURL_NTLM_WB_FILE

Static function wb_ntlm_close renamed to ntlm_wb_cleanup
Static function wb_ntlm_initiate renamed to ntlm_wb_init
Static function wb_ntlm_response renamed to ntlm_wb_response

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NTLM single-sign on adjustments (XI)

Feature string literal NTLM_SSO renamed to NTLM_WB.
Preprocessor symbol USE_NTLM_SSO renamed to WINBIND_NTLM_AUTH_ENABLED.
curl's 'long' option '

NTLM single-sign on adjustments (XI)

Feature string literal NTLM_SSO renamed to NTLM_WB.
Preprocessor symbol USE_NTLM_SSO renamed to WINBIND_NTLM_AUTH_ENABLED.
curl's 'long' option 'ntlm-sso' renamed to 'ntlm-wb'.
Fix some comments to make clear that this is actually a NTLM delegation.

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NTLM single-sign on adjustments (VIII)

Use preprocessor symbols WINBIND_NTLM_AUTH_ENABLED and WINBIND_NTLM_AUTH_FILE
for Samba's winbind daemon ntlm_auth helper code implementation and f

NTLM single-sign on adjustments (VIII)

Use preprocessor symbols WINBIND_NTLM_AUTH_ENABLED and WINBIND_NTLM_AUTH_FILE
for Samba's winbind daemon ntlm_auth helper code implementation and filename.

Retain preprocessor symbol USE_NTLM_SSO for NTLM single-sign-on feature
availability implementation independent.

For test harness, prefix NTLM_AUTH environment vars with CURL_

Refactor and rename configure option --with-ntlm-auth to --enable-wb-ntlm-auth[=FILE]

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serial number bump

duphandle: use ares_dup()

curl_easy_duphandle() was not properly duping the ares channel. The
ares_dup() function was introduced in c-ares 1.6.0 so by starting to use
this function w

duphandle: use ares_dup()

curl_easy_duphandle() was not properly duping the ares channel. The
ares_dup() function was introduced in c-ares 1.6.0 so by starting to use
this function we also raise the bar and require c-ares >= 1.6.0
(released Dec 9, 2008) for such builds.

Reported by: Ning Dong
Bug: http://curl.haxx.se/mail/lib-2010-08/0318.html

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configure: werror related adjustments

build: Enable configure --enable-werror

This passes -Werror to gcc when building curl and libcurl,
allowing easy dection of compile warnings.

Signed-off-by: Ben Greear <gree

build: Enable configure --enable-werror

This passes -Werror to gcc when building curl and libcurl,
allowing easy dection of compile warnings.

Signed-off-by: Ben Greear <greearb@candelatech.com>

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configure: spell --disable-threaded-resolver correctly

Previously we only accepted the option when named
--disable-threaded-resover, which wasn't quite intended.

Reported by: He

configure: spell --disable-threaded-resolver correctly

Previously we only accepted the option when named
--disable-threaded-resover, which wasn't quite intended.

Reported by: Helwing Lutz

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new configure option --enable-threaded-resolver

remove the CVSish $Id$ lines

update outdated serial number

Restore normal operation:

c-ares is only enabled when specifically requested.

Consequently, c-ares default setting is disabled.

fix c-ares assumed check being skipped