Remove enable-thread / disable-thread configure option. These were only placebo
options. The library is always built as thread safe as possible on every system.

ares/configure.ac

@@ -382,33 +382,6 @@ AC_HELP_STRING([--enable-libgcc],[use libgcc when linking]),
 )
 
 
-dnl Default is to try the thread-safe versions of a few functions
-OPT_THREAD=on
-
-AC_ARG_ENABLE(thread,dnl
-AC_HELP_STRING([--disable-thread],[don't look for thread-safe functions])
-AC_HELP_STRING([--enable-thread],[look for thread-safe functions]),
-[ case "$enableval" in
-  no)
-    OPT_THREAD=off
-    AC_MSG_WARN(c-ares will not get built using thread-safe functions)
-    ;;
-  *)
-    ;;
-  esac
-]
-)
-
-if test X"$OPT_THREAD" = Xoff
-then
-  AC_DEFINE(DISABLED_THREADSAFE, 1,
-    [Set to explicitly specify we don't want to use thread-safe functions])
-fi
-
-dnl for recent AIX versions, we skip all the thread-safe checks above since
-dnl they claim a thread-safe libc using the standard API. But there are
-dnl some functions still not thread-safe. Check for these!
-
 dnl Let's hope this split URL remains working:
 dnl http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/ \
 dnl genprogc/thread_quick_ref.htm

configure.ac

@@ -1827,51 +1827,6 @@ case "$LIBIDN" in
        ;;
 esac
 
-dnl Default is to try the thread-safe versions of a few functions
-OPT_THREAD=on
-
-AC_ARG_ENABLE(thread,dnl
-AC_HELP_STRING([--disable-thread],[don't look for thread-safe functions])
-AC_HELP_STRING([--enable-thread],[look for thread-safe functions]),
-[ case "$enableval" in
-  no)
-    OPT_THREAD=off
-    AC_MSG_WARN(libcurl will not get built using thread-safe functions)
-    ;;
-  *)
-    ;;
-  esac
-]
-)
-
-if test X"$OPT_THREAD" = Xoff
-then
-  AC_DEFINE(DISABLED_THREADSAFE, 1,
-    [Set to explicitly specify we don't want to use thread-safe functions])
-else
-  dnl if test "$ipv6" != "yes"; then
-    dnl dig around for gethostbyname_r()
-    dnl the old gethostbyname_r check was done here
-
-    dnl dig around for gethostbyaddr_r()
-    dnl the old gethostbyaddr_r check was here BUT COMMENTED OUT
-  dnl fi
-
-  dnl poke around for inet_ntoa_r()
-  dnl the old inet_ntoa_r check was done here
-
-  dnl is there a localtime_r()
-  dnl the old localtime_r check was done here
-
-  dnl is there a strerror_r()
-  dnl the old strerror_r check was done here
-
-  checkfor_gmtime_r="yes"
-fi
-
-dnl for recent AIX versions, we skip all the thread-safe checks above since
-dnl they claim a thread-safe libc using the standard API. But there are
-dnl some functions still not thread-safe. Check for these!
 
 dnl Let's hope this split URL remains working:
 dnl http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/ \

lib/config-os400.h

@@ -54,9 +54,6 @@
 /* Define this to your Entropy Gathering Daemon socket pathname */
 #undef EGD_SOCKET
 
-/* Set to explicitly specify we don't want to use thread-safe functions */
-#undef DISABLED_THREADSAFE
-
 /* Define to 1 if you have the alarm function. */
 #define HAVE_ALARM 1
 

lib/config-riscos.h

@@ -50,9 +50,6 @@
 /* Define this to your Entropy Gathering Daemon socket pathname */
 #undef EGD_SOCKET
 
-/* Set to explicitly specify we don't want to use thread-safe functions */
-#define DISABLED_THREADSAFE
-
 /* Define if you want to enable IPv6 support */
 #undef ENABLE_IPV6
 

lib/config-symbian.h

@@ -57,9 +57,6 @@
 /* when not building a shared library */
 /* #undef CURL_STATICLIB */
 
-/* Set to explicitly specify we don't want to use thread-safe functions */
-/* #undef DISABLED_THREADSAFE */
-
 /* your Entropy Gathering Daemon socket pathname */
 /* #undef EGD_SOCKET */
 

lib/config-tpf.h

@@ -47,9 +47,6 @@
 /* when not building a shared library */
 /* #undef CURL_STATICLIB */
 
-/* Set to explicitly specify we don't want to use thread-safe functions */
-/* #undef DISABLED_THREADSAFE */
-
 /* lber dynamic library file */
 /* #undef DL_LBER_FILE */
 

lib/config-vxworks.h

@@ -68,9 +68,6 @@
 /* when not building a shared library */
 /* #undef CURL_STATICLIB */
 
-/* Set to explicitly specify we don't want to use thread-safe functions */
-/* #undef DISABLED_THREADSAFE */
-
 /* your Entropy Gathering Daemon socket pathname */
 /* #undef EGD_SOCKET */
 

src/config-riscos.h

@@ -53,9 +53,6 @@
 /* Define this to your Entropy Gathering Daemon socket pathname */
 #undef EGD_SOCKET
 
-/* Set to explicitly specify we don't want to use thread-safe functions */
-#define DISABLED_THREADSAFE
-
 /* Define if you want to enable IPv6 support */
 #undef ENABLE_IPV6