Checking in vendor folder for ease of using go get.
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Renan DelValle
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vendor/git.apache.org/thrift.git/aclocal/ax_lib_event.m4
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vendored
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vendor/git.apache.org/thrift.git/aclocal/ax_lib_event.m4
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dnl @synopsis AX_LIB_EVENT([MINIMUM-VERSION])
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dnl
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dnl Test for the libevent library of a particular version (or newer).
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dnl
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dnl If no path to the installed libevent is given, the macro will first try
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dnl using no -I or -L flags, then searches under /usr, /usr/local, /opt,
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dnl and /opt/libevent.
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dnl If these all fail, it will try the $LIBEVENT_ROOT environment variable.
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dnl
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dnl This macro requires that #include <sys/types.h> works and defines u_char.
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dnl
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dnl This macro calls:
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dnl AC_SUBST(LIBEVENT_CPPFLAGS)
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dnl AC_SUBST(LIBEVENT_LDFLAGS)
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dnl AC_SUBST(LIBEVENT_LIBS)
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dnl
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dnl And (if libevent is found):
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dnl AC_DEFINE(HAVE_LIBEVENT)
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dnl
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dnl It also leaves the shell variables "success" and "ax_have_libevent"
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dnl set to "yes" or "no".
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dnl
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dnl NOTE: This macro does not currently work for cross-compiling,
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dnl but it can be easily modified to allow it. (grep "cross").
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dnl
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dnl @category InstalledPackages
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dnl @category C
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dnl @version 2007-09-12
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dnl @license AllPermissive
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dnl
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dnl Copyright (C) 2009 David Reiss
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dnl Copying and distribution of this file, with or without modification,
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dnl are permitted in any medium without royalty provided the copyright
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dnl notice and this notice are preserved.
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dnl Input: ax_libevent_path, WANT_LIBEVENT_VERSION
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dnl Output: success=yes/no
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AC_DEFUN([AX_LIB_EVENT_DO_CHECK],
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[
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# Save our flags.
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CPPFLAGS_SAVED="$CPPFLAGS"
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LDFLAGS_SAVED="$LDFLAGS"
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LIBS_SAVED="$LIBS"
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LD_LIBRARY_PATH_SAVED="$LD_LIBRARY_PATH"
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# Set our flags if we are checking a specific directory.
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if test -n "$ax_libevent_path" ; then
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LIBEVENT_CPPFLAGS="-I$ax_libevent_path/include"
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LIBEVENT_LDFLAGS="-L$ax_libevent_path/lib"
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LD_LIBRARY_PATH="$ax_libevent_path/lib:$LD_LIBRARY_PATH"
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else
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LIBEVENT_CPPFLAGS=""
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LIBEVENT_LDFLAGS=""
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fi
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# Required flag for libevent.
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LIBEVENT_LIBS="-levent"
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# Prepare the environment for compilation.
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CPPFLAGS="$CPPFLAGS $LIBEVENT_CPPFLAGS"
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LDFLAGS="$LDFLAGS $LIBEVENT_LDFLAGS"
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LIBS="$LIBS $LIBEVENT_LIBS"
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export CPPFLAGS
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export LDFLAGS
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export LIBS
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export LD_LIBRARY_PATH
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success=no
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# Compile, link, and run the program. This checks:
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# - event.h is available for including.
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# - event_get_version() is available for linking.
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# - The event version string is lexicographically greater
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# than the required version.
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AC_LANG_PUSH([C])
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dnl This can be changed to AC_LINK_IFELSE if you are cross-compiling,
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dnl but then the version cannot be checked.
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[
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#include <sys/types.h>
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#include <event.h>
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]], [[
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const char* lib_version = event_get_version();
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const char* wnt_version = "$WANT_LIBEVENT_VERSION";
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int lib_digits;
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int wnt_digits;
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for (;;) {
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/* If we reached the end of the want version. We have it. */
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if (*wnt_version == '\0' || *wnt_version == '-') {
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return 0;
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}
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/* If the want version continues but the lib version does not, */
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/* we are missing a letter. We don't have it. */
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if (*lib_version == '\0' || *lib_version == '-') {
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return 1;
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}
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/* In the 1.4 version numbering style, if there are more digits */
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/* in one version than the other, that one is higher. */
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for (lib_digits = 0;
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lib_version[lib_digits] >= '0' &&
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lib_version[lib_digits] <= '9';
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lib_digits++)
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;
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for (wnt_digits = 0;
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wnt_version[wnt_digits] >= '0' &&
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wnt_version[wnt_digits] <= '9';
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wnt_digits++)
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;
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if (lib_digits > wnt_digits) {
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return 0;
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}
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if (lib_digits < wnt_digits) {
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return 1;
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}
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/* If we have greater than what we want. We have it. */
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if (*lib_version > *wnt_version) {
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return 0;
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}
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/* If we have less, we don't. */
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if (*lib_version < *wnt_version) {
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return 1;
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}
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lib_version++;
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wnt_version++;
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}
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return 0;
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]])], [
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success=yes
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])
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AC_LANG_POP([C])
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# Restore flags.
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CPPFLAGS="$CPPFLAGS_SAVED"
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LDFLAGS="$LDFLAGS_SAVED"
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LIBS="$LIBS_SAVED"
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LD_LIBRARY_PATH="$LD_LIBRARY_PATH_SAVED"
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])
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AC_DEFUN([AX_LIB_EVENT],
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[
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dnl Allow search path to be overridden on the command line.
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AC_ARG_WITH([libevent],
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AS_HELP_STRING([--with-libevent@<:@=DIR@:>@], [use libevent [default=yes]. Optionally specify the root prefix dir where libevent is installed]),
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[
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if test "x$withval" = "xno"; then
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want_libevent="no"
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elif test "x$withval" = "xyes"; then
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want_libevent="yes"
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ax_libevent_path=""
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else
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want_libevent="yes"
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ax_libevent_path="$withval"
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fi
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],
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[ want_libevent="yes" ; ax_libevent_path="" ])
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if test "$want_libevent" = "yes"; then
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WANT_LIBEVENT_VERSION=ifelse([$1], ,1.2,$1)
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AC_MSG_CHECKING(for libevent >= $WANT_LIBEVENT_VERSION)
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# Run tests.
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if test -n "$ax_libevent_path"; then
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AX_LIB_EVENT_DO_CHECK
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else
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for ax_libevent_path in "" $lt_sysroot/usr $lt_sysroot/usr/local $lt_sysroot/opt $lt_sysroot/opt/local $lt_sysroot/opt/libevent "$LIBEVENT_ROOT" ; do
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AX_LIB_EVENT_DO_CHECK
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if test "$success" = "yes"; then
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break;
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fi
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done
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fi
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if test "$success" != "yes" ; then
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AC_MSG_RESULT(no)
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LIBEVENT_CPPFLAGS=""
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LIBEVENT_LDFLAGS=""
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LIBEVENT_LIBS=""
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else
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_LIBEVENT,,[define if libevent is available])
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ax_have_libevent_[]m4_translit([$1], [.], [_])="yes"
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fi
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ax_have_libevent="$success"
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AC_SUBST(LIBEVENT_CPPFLAGS)
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AC_SUBST(LIBEVENT_LDFLAGS)
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AC_SUBST(LIBEVENT_LIBS)
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fi
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])
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