Merge branch 'dp/autoconf-curl-ssl' into maint

The ./configure script generated from configure.ac was taught how
to detect support of SSL by libcurl better.

* dp/autoconf-curl-ssl:
./configure.ac: detect SSL in libcurl using curl-config

diff --combined configure.ac
index 7f39fd029b38381273111c89547d10093ef26d01,5e9ba59d59dee9eb0452e73a2d2808507f0ffda5..0b15f04b1089e48f20353cf068d7d37587b8d966
--- 1/configure.ac
--- 2/configure.ac
+++ b/configure.ac
@@@ -528,16 -528,6 +528,6 @@@ AC_CHECK_LIB([curl], [curl_global_init]
  [NO_CURL=],
  [NO_CURL=YesPlease])
  
- if test -z "${NO_CURL}" && test -z "${NO_OPENSSL}"; then
- 
- AC_CHECK_LIB([curl], [Curl_ssl_init],
- [NEEDS_SSL_WITH_CURL=YesPlease],
- [NEEDS_SSL_WITH_CURL=])
- 
- GIT_CONF_SUBST([NEEDS_SSL_WITH_CURL])
- 
- fi
- 
  GIT_UNSTASH_FLAGS($CURLDIR)
  
  GIT_CONF_SUBST([NO_CURL])
@@@ -550,6 -540,17 +540,17 @@@ AC_CHECK_PROG([CURL_CONFIG], [curl-conf
  
  if test $CURL_CONFIG != no; then
      GIT_CONF_SUBST([CURL_CONFIG])
+     if test -z "${NO_OPENSSL}"; then
+       AC_MSG_CHECKING([if Curl supports SSL])
+       if test $(curl-config --features|grep SSL) = SSL; then
+          NEEDS_SSL_WITH_CURL=YesPlease
+          AC_MSG_RESULT([yes])
+       else
+          NEEDS_SSL_WITH_CURL=
+          AC_MSG_RESULT([no])
+       fi
+       GIT_CONF_SUBST([NEEDS_SSL_WITH_CURL])
+     fi
  fi
  
  fi
@@@ -835,10 -836,9 +836,10 @@@ AC_CHECK_TYPE([struct addrinfo],
  ])
  GIT_CONF_SUBST([NO_IPV6])
  #
 -# Define NO_REGEX if you have no or inferior regex support in your C library.
 -AC_CACHE_CHECK([whether the platform regex can handle null bytes],
 - [ac_cv_c_excellent_regex], [
 +# Define NO_REGEX if your C library lacks regex support with REG_STARTEND
 +# feature.
 +AC_CACHE_CHECK([whether the platform regex supports REG_STARTEND],
 + [ac_cv_c_regex_with_reg_startend], [
  AC_EGREP_CPP(yippeeyeswehaveit,
        AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
  #include <regex.h>
@@@ -847,10 -847,10 +848,10 @@@
  yippeeyeswehaveit
  #endif
  ]),
 -      [ac_cv_c_excellent_regex=yes],
 -      [ac_cv_c_excellent_regex=no])
 +      [ac_cv_c_regex_with_reg_startend=yes],
 +      [ac_cv_c_regex_with_reg_startend=no])
  ])
 -if test $ac_cv_c_excellent_regex = yes; then
 +if test $ac_cv_c_regex_with_reg_startend = yes; then
        NO_REGEX=
  else
        NO_REGEX=YesPlease
@@@ -1109,19 -1109,14 +1110,19 @@@ GIT_CONF_SUBST([HAVE_BSD_SYSCTL]
  AC_DEFUN([PTHREADTEST_SRC], [
  AC_LANG_PROGRAM([[
  #include <pthread.h>
 +static void *noop(void *ignore) { return ignore; }
  ]], [[
        pthread_mutex_t test_mutex;
        pthread_key_t test_key;
 +      pthread_t th;
        int retcode = 0;
 +      void *ret = (void *)0;
        retcode |= pthread_key_create(&test_key, (void *)0);
        retcode |= pthread_mutex_init(&test_mutex,(void *)0);
        retcode |= pthread_mutex_lock(&test_mutex);
        retcode |= pthread_mutex_unlock(&test_mutex);
 +      retcode |= pthread_create(&th, ret, noop, ret);
 +      retcode |= pthread_join(th, &ret);
        return retcode;
  ]])])