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 ## Process this file with autoconf to produce configure.

 ## In general, the safest way to proceed is to run the following:

 ##    % aclocal -I . -I `pwd`/../autoconf && autoheader && autoconf && automake

 # make sure we're interpreted by some minimal autoconf

 AC_PREREQ(2.57)

 AC_INIT(glog, 0.3.1, opensource@google.com)

 # The argument here is just something that should be in the current directory

 # (for sanity checking)

 AC_CONFIG_SRCDIR(README)

 AC_CONFIG_MACRO_DIR([m4])

 AM_INIT_AUTOMAKE

 AM_CONFIG_HEADER(src/config.h)

 AC_LANG(C++)

 # Checks for programs.

 AC_PROG_CC

 AC_PROG_CPP

 AC_PROG_CXX

 AM_CONDITIONAL(GCC, test "$GCC" = yes)   # let the Makefile know if we're gcc

 AC_PROG_LIBTOOL

 AC_SUBST(LIBTOOL_DEPS)

 # Check whether some low-level functions/files are available

 AC_HEADER_STDC

 # These are tested for by AC_HEADER_STDC, but I check again to set the var

 AC_CHECK_HEADER(stdint.h, ac_cv_have_stdint_h=1, ac_cv_have_stdint_h=0)

 AC_CHECK_HEADER(sys/types.h, ac_cv_have_systypes_h=1, ac_cv_have_systypes_h=0)

 AC_CHECK_HEADER(inttypes.h, ac_cv_have_inttypes_h=1, ac_cv_have_inttypes_h=0)

 AC_CHECK_HEADERS(unistd.h, ac_cv_have_unistd_h=1, ac_cv_have_unistd_h=0)

 AC_CHECK_HEADERS(syscall.h)

 AC_CHECK_HEADERS(sys/syscall.h)

 # For backtrace with glibc.

 AC_CHECK_HEADERS(execinfo.h)

 # For backtrace with libunwind.

 AC_CHECK_HEADERS(libunwind.h, ac_cv_have_libunwind_h=1, ac_cv_have_libunwind_h=0)

 AC_CHECK_HEADERS(ucontext.h)

 AC_CHECK_HEADERS(sys/utsname.h)

 AC_CHECK_HEADERS(pwd.h)

 AC_CHECK_HEADERS(syslog.h)

 AC_CHECK_HEADERS(sys/time.h)

 AC_CHECK_HEADERS(glob.h)

 AC_CHECK_SIZEOF(void *)

 # These are the types I need.  We look for them in either stdint.h,

 # sys/types.h, or inttypes.h, all of which are part of the default-includes.

 AC_CHECK_TYPE(uint16_t, ac_cv_have_uint16_t=1, ac_cv_have_uint16_t=0)

 AC_CHECK_TYPE(u_int16_t, ac_cv_have_u_int16_t=1, ac_cv_have_u_int16_t=0)

 AC_CHECK_TYPE(__uint16, ac_cv_have___uint16=1, ac_cv_have___uint16=0)

 AC_CHECK_FUNC(sigaltstack,

               AC_DEFINE(HAVE_SIGALTSTACK, 1,

                         [Define if you have the `sigaltstack' function]))

 AC_CHECK_FUNC(dladdr,

               AC_DEFINE(HAVE_DLADDR, 1,

                         [Define if you have the `dladdr' function]))

 AC_CHECK_FUNC(fcntl,

               AC_DEFINE(HAVE_FCNTL, 1,

                         [Define if you have the `fcntl' function]))

 AX_C___ATTRIBUTE__

 # We only care about these two attributes.

 if test x"$ac_cv___attribute__" = x"yes"; then

   ac_cv___attribute___noreturn="__attribute__ ((noreturn))"

   ac_cv___attribute___printf_4_5="__attribute__((__format__ (__printf__, 4, 5)))"

 else

   ac_cv___attribute___noreturn=

   ac_cv___attribute___printf_4_5=

 fi

 AX_C___BUILTIN_EXPECT

 if test x"$ac_cv___builtin_expect" = x"yes"; then

   ac_cv_have___builtin_expect=1

 else

   ac_cv_have___builtin_expect=0

 fi

 AX_C___SYNC_VAL_COMPARE_AND_SWAP

 # On x86_64, instead of libunwind, we can choose to compile with frame-pointers

 # (This isn't needed on i386, where -fno-omit-frame-pointer is the default).

 AC_ARG_ENABLE(frame_pointers,

               AS_HELP_STRING([--enable-frame-pointers],

                              [On x86_64 systems, compile with -fno-omit-frame-pointer (see INSTALL)]),,

               enable_frame_pointers=no)

 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [return __x86_64__ == 1 ? 0 : 1])],

                   [is_x86_64=yes], [is_x86_64=no])

 AM_CONDITIONAL(ENABLE_FRAME_POINTERS, test "$enable_frame_pointers" = yes)

 AM_CONDITIONAL(X86_64, test "$is_x86_64" = yes)

 # Some of the code in this directory depends on pthreads

 ACX_PTHREAD

 if test x"$acx_pthread_ok" = x"yes"; then

   # To make libglog depend on libpthread on Linux, we need to add

   # -lpthread in addition to -pthread.

   AC_CHECK_LIB(pthread, pthread_self)

 fi

 # Check if there is google-gflags library installed.

 SAVE_CFLAGS="$CFLAGS"

 SAVE_LIBS="$LIBS"

 AC_ARG_WITH(gflags, AS_HELP_STRING[--with-gflags=GFLAGS_DIR],

   GFLAGS_CFLAGS="-I${with_gflags}/include"

   GFLAGS_LIBS="-L${with_gflags}/lib -lgflags"

   CFLAGS="$CFLAGS $GFLAGS_CFLAGS"

   LIBS="$LIBS $GFLAGS_LIBS"

 )

 AC_CHECK_LIB(gflags, main, ac_cv_have_libgflags=1, ac_cv_have_libgflags=0)

 if test x"$ac_cv_have_libgflags" = x"1"; then

   AC_DEFINE(HAVE_LIB_GFLAGS, 1, [define if you have google gflags library])

   if test x"$GFLAGS_LIBS" = x""; then

     GFLAGS_LIBS="-lgflags"

   fi

 else

   GFLAGS_CFLAGS=

   GFLAGS_LIBS=

 fi

 CFLAGS="$SAVE_CFLAGS"

 LIBS="$SAVE_LIBS"

 # TODO(hamaji): Use official m4 macros provided by testing libraries

 #               once the m4 macro of Google Mocking becomes ready.

 # Check if there is Google Test library installed.

 AC_CHECK_PROG(GTEST_CONFIG, gtest-config, "yes")

 if test x"$GTEST_CONFIG" = "xyes"; then

   GTEST_CFLAGS=`gtest-config --cppflags --cxxflags`

   GTEST_LIBS=`gtest-config --ldflags --libs`

   AC_DEFINE(HAVE_LIB_GTEST, 1, [define if you have google gtest library])

   # Check if there is Google Mocking library installed.

   AC_CHECK_PROG(GMOCK_CONFIG, gmock-config, "yes")

   if test x"$GMOCK_CONFIG" = "xyes"; then

     GMOCK_CFLAGS=`gmock-config --cppflags --cxxflags`

     GMOCK_LIBS=`gmock-config --ldflags --libs`

     AC_DEFINE(HAVE_LIB_GMOCK, 1, [define if you have google gmock library])

   else

     # We don't run test cases which use Google Mocking framework.

     GMOCK_CFLAGS=

     GMOCK_LIBS=

   fi

 else

   # We'll use src/googletest.h for our unittests.

   GTEST_CFLAGS=

   GTEST_LIBS=

 fi

 AM_CONDITIONAL(HAVE_GMOCK, test x"$GMOCK_CONFIG" = "xyes")

 # We want to link in libunwind if it exists

 UNWIND_LIBS=

 # Unfortunately, we need to check the header file in addition to the

 # lib file to check if libunwind is available since libunwind-0.98

 # doesn't install all necessary header files.

 if test x"$ac_cv_have_libunwind_h" = x"1"; then

  AC_CHECK_LIB(unwind, backtrace, UNWIND_LIBS=-lunwind)

 fi

 AC_SUBST(UNWIND_LIBS)

 if test x"$UNWIND_LIBS" != x""; then

   AC_DEFINE(HAVE_LIB_UNWIND, 1, [define if you have libunwind])

 fi

 # We'd like to use read/write locks in several places in the code.

 # See if our pthreads support extends to that.  Note: for linux, it

 # does as long as you define _XOPEN_SOURCE appropriately.

 AC_RWLOCK

 # Find out what namespace 'normal' STL code lives in, and also what namespace

 # the user wants our classes to be defined in

 AC_CXX_STL_NAMESPACE

 AC_DEFINE_GOOGLE_NAMESPACE(google)

 AC_CXX_USING_OPERATOR

 AC_PC_FROM_UCONTEXT(AC_MSG_WARN(Could not find the PC.  Will not output failed addresses...))

 AC_DEFINE_UNQUOTED(TEST_SRC_DIR, "$srcdir", [location of source code])

 # These are what's needed by logging.h.in and raw_logging.h.in

 AC_SUBST(ac_google_start_namespace)

 AC_SUBST(ac_google_end_namespace)

 AC_SUBST(ac_google_namespace)

 AC_SUBST(ac_cv_cxx_using_operator)

 AC_SUBST(ac_cv___attribute___noreturn)

 AC_SUBST(ac_cv___attribute___printf_4_5)

 AC_SUBST(ac_cv_have___builtin_expect)

 AC_SUBST(ac_cv_have_stdint_h)

 AC_SUBST(ac_cv_have_systypes_h)

 AC_SUBST(ac_cv_have_inttypes_h)

 AC_SUBST(ac_cv_have_unistd_h)

 AC_SUBST(ac_cv_have_uint16_t)

 AC_SUBST(ac_cv_have_u_int16_t)

 AC_SUBST(ac_cv_have___uint16)

 AC_SUBST(ac_cv_have_libgflags)

 AC_SUBST(GFLAGS_CFLAGS)

 AC_SUBST(GTEST_CFLAGS)

 AC_SUBST(GMOCK_CFLAGS)

 AC_SUBST(GFLAGS_LIBS)

 AC_SUBST(GTEST_LIBS)

 AC_SUBST(GMOCK_LIBS)

 # Write generated configuration file

 AC_CONFIG_FILES([Makefile src/glog/logging.h src/glog/raw_logging.h src/glog/vlog_is_on.h src/glog/stl_logging.h])

 AC_OUTPUT(libglog.pc)