configure: remove use of deprecated macros

AC_HEADER_TIME, AC_HEADER_STDC and AC_TYPE_SIGNAL

configure: s/AC_HELP_STRING/AS_HELP_STRING

AC_HELP_STRING is deprecated in 2.70+ and I believe AS_HELP_STRING works
already since 2.59 so bump the minimum required version to that.

configure: s/AC_HELP_STRING/AS_HELP_STRING

AC_HELP_STRING is deprecated in 2.70+ and I believe AS_HELP_STRING works
already since 2.59 so bump the minimum required version to that.

Reported-by: Emil Engler
Fixes #6647
Closes #6748

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build: delete unused feature guards

- `HAVE_STRNCASECMP`
- `HAVE_TCGETATTR`
- `HAVE_TCSETATTR`

Reviewed-by: Jay Satiro
Reviewed-by: Daniel Stenberg
Closes #6645

curl.se: new home

Closes #6172

curl-functions.m4: remove inappropriate AC_REQUIRE

AC_REQUIRE means "if this macro hasn't been executed already, execute
it". So in a wrapper around AC_RUN_IFELSE, AC_REQUIRE(AC_RUN_IFE

curl-functions.m4: remove inappropriate AC_REQUIRE

AC_REQUIRE means "if this macro hasn't been executed already, execute
it". So in a wrapper around AC_RUN_IFELSE, AC_REQUIRE(AC_RUN_IFELSE)
isn't correct at that will execute AC_RUN_IFELSE without any arguments.

With autoconf 2.69 this is basically a no-op, but with autoconf 2.70,
AC_RUN_IFELSE without a default value when cross-compiling is fatal.
The result is that curl with autoconf 2.70 cannot cross-compile.

Fixes https://github.com/curl/curl/issues/5126
Closes https://github.com/curl/curl/pull/5130

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cleanup: fix typos and wording in docs and comments

Closes #4869
Reviewed-by: Emil Engler and Daniel Gustafsson

configure: fix --disable-code-coverage

This fixes the case when --disable-code-coverage supplied to ./configure
would result in coverage="yes" being set.

Closes #4099
Review

configure: fix --disable-code-coverage

This fixes the case when --disable-code-coverage supplied to ./configure
would result in coverage="yes" being set.

Closes #4099
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>

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configure/cmake: check for if_nametoindex()

- adds the check to cmake

- fixes the configure check to work for cross-compiled windows builds

Closes #3917

configure: detect getsockname and getpeername on windows too

Made detection macros for these two functions in the same style as other
functions possibly in winsock in the hope this will

configure: detect getsockname and getpeername on windows too

Made detection macros for these two functions in the same style as other
functions possibly in winsock in the hope this will work better to
detect these functions when cross-compiling for Windows.

Follow-up to e91e4816123

Fixes #3913
Closes #3915

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configure: add --with-amissl

AmiSSL is an Amiga native library which provides a wrapper over OpenSSL.
It also requires all programs using it to use bsdsocket.library
directly, rather

configure: add --with-amissl

AmiSSL is an Amiga native library which provides a wrapper over OpenSSL.
It also requires all programs using it to use bsdsocket.library
directly, rather than accessing socket functions through clib, which
libcurl was not necessarily doing previously. Configure will now check
for the headers and ensure they are included if found.

Closes #3677

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configure: remove the unused fdopen macro

and the two remaining #ifdefs for it

Closes #3600

configure: rewrite --enable-code-coverage

The previously used ax_code_coverage.m4 is not license compatible and
must not be used.

Reported-by: William A. Rowe Jr
Fixes #3497

configure: rewrite --enable-code-coverage

The previously used ax_code_coverage.m4 is not license compatible and
must not be used.

Reported-by: William A. Rowe Jr
Fixes #3497
Closes #3499

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configure: s/AC_RUN_IFELSE/CURL_RUN_IFELSE

fix a few leftovers

Fixes #3006
Closes #3049

configure: replace AC_TRY_RUN with CURL_RUN_IFELSE

... and export LD_LIBRARY_PATH properly. This is a follow-up from
2d4c215.

Fixes #2586
Reported-by: Bernhard Walle

configure: keep LD_LIBRARY_PATH changes local

... only set it when we actually have to run tests to reduce its impact
on for example build commands etc.

Fixes #2490
Closes #

configure: keep LD_LIBRARY_PATH changes local

... only set it when we actually have to run tests to reduce its impact
on for example build commands etc.

Fixes #2490
Closes #2492

Reported-by: Dmitry Mikhirev

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configure/CURL_CHECK_FUNC_POLL: disable poll completely on mac

... so that the same libcurl build easier can run on any version.

Follow-up to issue #1057

configure: detect the broken poll() in macOS 10.12

Fixes #1057

configure: ac_cv_ -> curl_cv_ for write-only vars

These configure vars are modified in a curl-specific way but never
evaluated or loaded from cache, even though they are designated as

configure: ac_cv_ -> curl_cv_ for write-only vars

These configure vars are modified in a curl-specific way but never
evaluated or loaded from cache, even though they are designated as
_cv_. We could either implement proper AC_CACHE_CHECKs for them, or
remove them completely.

Fixes #603 as ac_cv_func_gethostbyname is no longer clobbered, and
AC_CHECK_FUNC(gethostbyname...) will no longer spuriously succeed after
the first configure run with caching.

`ac_cv_func_strcasecmp` is curious, see #770.

`eval "ac_cv_func_$func=yes"` can still cause problems as it works in
tandem with AC_CHECK_FUNCS and then potentially modifies its result. It
would be best to rewrite this test to use a new CURL_CHECK_FUNCS macro,
which works the same as AC_CHECK_FUNCS but relies on caching the values
of curl_cv_func_* variables, without modifiying ac_cv_func_*.

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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://

configure: detect IPv6 support on Windows

This patch was "nicked" from the MINGW-packages project by Daniel.

https://github.com/Alexpux/MINGW-packages/commit/9253d0bf58a1486e91f7efb

configure: detect IPv6 support on Windows

This patch was "nicked" from the MINGW-packages project by Daniel.

https://github.com/Alexpux/MINGW-packages/commit/9253d0bf58a1486e91f7efb5316e7fdb48fa4007
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

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Enable poll on darwin13

Poll has long been broken on Mac OS X. Starting with 10.9 (darwin13) it
now works correctly so this patch enables it there.

strcasestr: remove check for this unused function

strlcat: remove function

This function was only used twice, both in places where performance
isn't crucial (socks + if2ip). Removing the use of this function removes
the need to have

strlcat: remove function

This function was only used twice, both in places where performance
isn't crucial (socks + if2ip). Removing the use of this function removes
the need to have our private version for systems without it == reduced
amount of code.

Also, in the SOCKS case it is clearly better to fail gracefully rather
than to truncate the results.

This work was triggered by a bug report on the strcal prototype in
strequal.h.

strlcat was added in commit db70cd28 in February 2001!

Bug: http://curl.haxx.se/bug/view.cgi?id=1192
Reported by: Jeremy Huddleston

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