Fixes test failures because of wrong line endings on Windows.

Multi-threaded applictions basically MUST set CURLOPT_NO_SIGNAL to 1L to
avoid the risk of getting a SIGPIPE.

Either way, a multi-threaded application that uses libcurl/openssl needs
to have a signhandler for or ignore SIGPIPE on its own.

Based on discussions in #2800
Closes #2904

- test 1268 requires unix sockets
- test 2072 must be disabled also for MSYS/MinGW

When Curl_http2_done() gets called before the http2 data is setup all
the way, we cannot send anything and this should just return an error.

Detected by OSS-Fuzz
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10012

Closes #2903

... as no other comments are accepted since 014ed7c2

Modifying the locale with environment variables doesn't work for native
Windows applications. Just disable the test in this case if the decimal
separator is something different than a point. Use a precheck with a
small C program to achieve that.

Closes https://github.com/curl/curl/pull/2786

This enables the following additional warnings:
-Wold-style-definition
-Warray-bounds=2 instead of the default 1
-Wformat=2, but only for GCC 4.8+ as Wno-format-nonliteral is not
 respected for older versions
-Wunused-const-variable, which enables level 2 instead of the default 1
-Warray-bounds also in debug mode through -ftree-vrp
-Wnull-dereference also in debug mode through
 -fdelete-null-pointer-checks

Closes https://github.com/curl/curl/pull/2747

This enables level 4 instead of the default level 3, which of the
currently used comments only allows /* FALLTHROUGH */ to silence the
warning.

Closes https://github.com/curl/curl/pull/2747

This warning used to be enabled only for clang as it's a bit stricter
on GCC. Silence the remaining occurrences and enable it on GCC too.

Closes https://github.com/curl/curl/pull/2747

Enable pedantic-errors for GCC >= 5 with --enable-werror. Before GCC 5,
pedantic-errors was synonymous to -Werror=pedantic [0], which is still
the case for clang [1]. With GCC 5, it became complementary [2].

Also fix a resulting error in acinclude.m4 as main's return type was
missing, which is illegal in C99.

[0] https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/Warning-Options.html
[1] https://clang.llvm.org/docs/UsersManual.html#options-to-control-error-and-warning-messages
[2] https://gcc.gnu.org/onlinedocs/gcc-5.1.0/gcc/Warning-Options.html

Closes https://github.com/curl/curl/pull/2747

Closes https://github.com/curl/curl/pull/2747

and remove the private SIZE_T_MAX define and use the generic one.

Closes #2902

Since the public pinning support was brought in e644866c. GnuTLS
2.11.3 was released in October 2010.

Figured out in #2890

... before the stream is started, we have it set to -1.

Fixes #2894
Closes #2898

... for extracting certs from a live HTTPS server to make a cacerts.pem
from them.

To make uploads significantly faster in some circumstances.

Part 2 of #2888
Closes #2892

Saves 16KB on the easy handle for operations that don't need that
buffer.

Part 1 of #2888

Handles created with curl_easy_duphandle do not use the SSL engine set
up in the original handle. This fixes the issue by storing the engine
name in the internal url state and setting the engine from its name
inside curl_easy_duphandle.

Reported-by: Anton Gerasimov
Signed-of-by: Laurent Bonnans
Fixes #2829
Closes #2833

If this is the last stream on this connection, the RST_STREAM might not
get pushed to the wire otherwise.

Fixes #2882
Closes #2887
Researched-by: Michael Kaufmann

Follow-up to 099f37e9

Pointed-out-by: Marcel Raad

This struct field is never set TRUE in any existing code path. This
change removes the field completely.

Closes #2871

... simply because this is usually a sign of the user having omitted the
file name and the next option is instead "eaten" by the parser as a file
name.

Add test1268 to verify

Closes #2885

Might help bug #2688 debugging

Closes #2880

... since the gcc-8 ones seem to fail frequently.

Follow-up from b8520719

Closes #2886

... and now listed in alphabetical order!

This change allows to use the CMake config files generated by Curl's
CMake scripts for static builds of the library.
The symbol CURL_STATIC lib must be defined to compile downstream,
thus the config package is the perfect place to do so.

Fixes #2817
Closes #2823
Reported-by: adnn on github
Reviewed-by: Sergei Nikulov

Added test 656 (based on test 604) to verify the fix.

Bug: https://bugzilla.redhat.com/1595135

Closes #2879

The verbose message "Authentication using SSH public key file" was
printed each time the ssh_userauth_publickey_auto() was called, which
meant each time a packet was transferred over network because the API
operates in non-blocking mode.

This patch makes sure that the verbose message is printed just once
(when the authentication state is entered by the SSH state machine).

Since they started to fail almost 100% since a few days.

Closes #2876

Closes https://github.com/curl/curl/pull/2869

Deal with tiny "HTTP/0.9" (header-less) responses by checking the
status-line early, even before a full "HTTP/" is received to allow
detecting 0.9 properly.

Test 1266 and 1267 added to verify.

Fixes #2420
Closes #2872

... to make make the files appear in distribution tarballs

Closes #2856

... when curl is built from distribution tarball

Closes #2856

Split off testing file names with double quotes into new test 1158.
Disable it for MSYS using a precheck as it doesn't support file names
with double quotes (but Cygwin does, for example).

Fixes https://github.com/curl/curl/issues/2796
Closes https://github.com/curl/curl/pull/2854

- Determine if perl is in the user's PATH by running perl.exe.

Prior to this change detection was done by checking the PATH for perl/
but that did not work in all cases (eg git install includes perl but
not in perl/ path).

Bug: https://github.com/curl/curl/pull/2865
Reported-by: Daniel Jeliński