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Diffstat (limited to '')
| -rw-r--r-- | src/jaegertracing/thrift/aclocal/ax_lib_event.m4 | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/jaegertracing/thrift/aclocal/ax_lib_event.m4 b/src/jaegertracing/thrift/aclocal/ax_lib_event.m4 new file mode 100644 index 000000000..d4dcdc9a6 --- /dev/null +++ b/src/jaegertracing/thrift/aclocal/ax_lib_event.m4 @@ -0,0 +1,194 @@ +dnl @synopsis AX_LIB_EVENT([MINIMUM-VERSION]) +dnl +dnl Test for the libevent library of a particular version (or newer). +dnl +dnl If no path to the installed libevent is given, the macro will first try +dnl using no -I or -L flags, then searches under /usr, /usr/local, /opt, +dnl and /opt/libevent. +dnl If these all fail, it will try the $LIBEVENT_ROOT environment variable. +dnl +dnl This macro requires that #include <sys/types.h> works and defines u_char. +dnl +dnl This macro calls: +dnl AC_SUBST(LIBEVENT_CPPFLAGS) +dnl AC_SUBST(LIBEVENT_LDFLAGS) +dnl AC_SUBST(LIBEVENT_LIBS) +dnl +dnl And (if libevent is found): +dnl AC_DEFINE(HAVE_LIBEVENT) +dnl +dnl It also leaves the shell variables "success" and "ax_have_libevent" +dnl set to "yes" or "no". +dnl +dnl NOTE: This macro does not currently work for cross-compiling, +dnl but it can be easily modified to allow it. (grep "cross"). +dnl +dnl @category InstalledPackages +dnl @category C +dnl @version 2007-09-12 +dnl @license AllPermissive +dnl +dnl Copyright (C) 2009 David Reiss +dnl Copying and distribution of this file, with or without modification, +dnl are permitted in any medium without royalty provided the copyright +dnl notice and this notice are preserved. + +dnl Input: ax_libevent_path, WANT_LIBEVENT_VERSION +dnl Output: success=yes/no +AC_DEFUN([AX_LIB_EVENT_DO_CHECK], + [ + # Save our flags. + CPPFLAGS_SAVED="$CPPFLAGS" + LDFLAGS_SAVED="$LDFLAGS" + LIBS_SAVED="$LIBS" + LD_LIBRARY_PATH_SAVED="$LD_LIBRARY_PATH" + + # Set our flags if we are checking a specific directory. + if test -n "$ax_libevent_path" ; then + LIBEVENT_CPPFLAGS="-I$ax_libevent_path/include" + LIBEVENT_LDFLAGS="-L$ax_libevent_path/lib" + LD_LIBRARY_PATH="$ax_libevent_path/lib:$LD_LIBRARY_PATH" + else + LIBEVENT_CPPFLAGS="" + LIBEVENT_LDFLAGS="" + fi + + # Required flag for libevent. + LIBEVENT_LIBS="-levent" + + # Prepare the environment for compilation. + CPPFLAGS="$CPPFLAGS $LIBEVENT_CPPFLAGS" + LDFLAGS="$LDFLAGS $LIBEVENT_LDFLAGS" + LIBS="$LIBS $LIBEVENT_LIBS" + export CPPFLAGS + export LDFLAGS + export LIBS + export LD_LIBRARY_PATH + + success=no + + # Compile, link, and run the program. This checks: + # - event.h is available for including. + # - event_get_version() is available for linking. + # - The event version string is lexicographically greater + # than the required version. + AC_LANG_PUSH([C]) + dnl This can be changed to AC_LINK_IFELSE if you are cross-compiling, + dnl but then the version cannot be checked. + AC_LINK_IFELSE([AC_LANG_PROGRAM([[ + #include <sys/types.h> + #include <event.h> + ]], [[ + const char* lib_version = event_get_version(); + const char* wnt_version = "$WANT_LIBEVENT_VERSION"; + int lib_digits; + int wnt_digits; + for (;;) { + /* If we reached the end of the want version. We have it. */ + if (*wnt_version == '\0' || *wnt_version == '-') { + return 0; + } + /* If the want version continues but the lib version does not, */ + /* we are missing a letter. We don't have it. */ + if (*lib_version == '\0' || *lib_version == '-') { + return 1; + } + /* In the 1.4 version numbering style, if there are more digits */ + /* in one version than the other, that one is higher. */ + for (lib_digits = 0; + lib_version[lib_digits] >= '0' && + lib_version[lib_digits] <= '9'; + lib_digits++) + ; + for (wnt_digits = 0; + wnt_version[wnt_digits] >= '0' && + wnt_version[wnt_digits] <= '9'; + wnt_digits++) + ; + if (lib_digits > wnt_digits) { + return 0; + } + if (lib_digits < wnt_digits) { + return 1; + } + /* If we have greater than what we want. We have it. */ + if (*lib_version > *wnt_version) { + return 0; + } + /* If we have less, we don't. */ + if (*lib_version < *wnt_version) { + return 1; + } + lib_version++; + wnt_version++; + } + return 0; + ]])], [ + success=yes + ]) + AC_LANG_POP([C]) + + # Restore flags. + CPPFLAGS="$CPPFLAGS_SAVED" + LDFLAGS="$LDFLAGS_SAVED" + LIBS="$LIBS_SAVED" + LD_LIBRARY_PATH="$LD_LIBRARY_PATH_SAVED" + ]) + + +AC_DEFUN([AX_LIB_EVENT], + [ + + dnl Allow search path to be overridden on the command line. + AC_ARG_WITH([libevent], + AS_HELP_STRING([--with-libevent@<:@=DIR@:>@], [use libevent [default=yes]. Optionally specify the root prefix dir where libevent is installed]), + [ + if test "x$withval" = "xno"; then + want_libevent="no" + elif test "x$withval" = "xyes"; then + want_libevent="yes" + ax_libevent_path="" + else + want_libevent="yes" + ax_libevent_path="$withval" + fi + ], + [ want_libevent="yes" ; ax_libevent_path="" ]) + + + if test "$want_libevent" = "yes"; then + WANT_LIBEVENT_VERSION=ifelse([$1], ,1.2,$1) + + AC_MSG_CHECKING(for libevent >= $WANT_LIBEVENT_VERSION) + + # Run tests. + if test -n "$ax_libevent_path"; then + AX_LIB_EVENT_DO_CHECK + else + 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 + AX_LIB_EVENT_DO_CHECK + if test "$success" = "yes"; then + break; + fi + done + fi + + if test "$success" != "yes" ; then + AC_MSG_RESULT(no) + LIBEVENT_CPPFLAGS="" + LIBEVENT_LDFLAGS="" + LIBEVENT_LIBS="" + else + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_LIBEVENT,,[define if libevent is available]) + ax_have_libevent_[]m4_translit([$1], [.], [_])="yes" + fi + + ax_have_libevent="$success" + + AC_SUBST(LIBEVENT_CPPFLAGS) + AC_SUBST(LIBEVENT_LDFLAGS) + AC_SUBST(LIBEVENT_LIBS) + fi + + ]) |