make CURLOPT_PROXYUSERPWD sort of deprecated. The primary motive for adding
  these new options is that they have no problems with the colon separator
  that the CURLOPT_PROXYUSERPWD option does.

that's not exported by the lib

used in strequal.c so now all test cases run fine for me again.

are consecutive and with a 0x20 "distance" to the uppercase letter), since we do
support EBCDIC as well. Thus I replaced the macro with a (larger) switch case.

I better change the function name...

  (http://curl.haxx.se/bug/view.cgi?id=2154627) which pointed out that libcurl
  uses strcasecmp() in multiple places where it causes failures when the
  Turkish locale is used. This is because 'i' and 'I' isn't the same letter so
  strcasecmp() on those letters are different in Turkish than in English (or
  just about all other languages). I thus introduced a totally new internal
  function in libcurl (called Curl_ascii_equal) for doing case insentive
  comparisons for english-(ascii?) style strings that thus will make "file"
  and "FILE" match even if the Turkish locale is selected.

to the shell echo command are not interpreted when trying to
remove extra whitespace from shell variable content.

return code.  This way, if the precheck command can't be run at all for
whatever reason, it's treated as a precheck failure which causes the
test to be skipped.

  (http://curl.haxx.se/bug/view.cgi?id=2155496) pointing out an error case
  without a proper human-readable error message. When a read callback returns
  a too large value (like when trying to return a negative number) it would
  trigger and the generic error message then makes the proplem slightly
  different to track down. I've added an error message for this now.

  Disable warnings on structure members padding.

  `variable' might be clobbered by `longjmp' or `vfork'

  Remove -b from debug-enabled configuration, as Tiny C might have
  been built without the memory and bounds checker support.

  Better disable following warnings when cross-compiling with a gcc older
  than 3.0, to avoid warnings from third party system headers:

    -Wmissing-declarations
    -Wmissing-prototypes
    -Wunused
    -Wshadow

options don't succeed in opening the target file etc. Detected by coverity.com

coverity.com

has already been dereferenced so it is bound to be valid. Pointed out to us
by coverity.com

  Disable following warnings when cross-compiling with a gcc older
  than 3.0, to avoid warnings from third party system headers:

    -Wmissing-prototypes
    -Wunused
    -Wshadow

And on the other hand a message after setsockopt() certainly must use SOCKERRNO.

  Do not enable -pedantic when cross-compiling with a gcc older
  than 3.0, to avoid warnings from third party system headers.