## Process this file with autoconf to produce configure.
## In general, the safest way to proceed is to run ./autogen.sh

# make sure we're interpreted by some minimal autoconf
AC_PREREQ(2.57)

AC_INIT(gflags, 1.7, opensource@google.com)
# Update this value for every release!  (A:B:C will map to foo.so.(A-C).C.B)
# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
SO_VERSION=3:0:1

# 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([dist-zip])
AM_CONFIG_HEADER(src/config.h)

# Checks for programs.
AC_PROG_CXX
AC_PROG_CC
AC_PROG_CPP
AM_CONDITIONAL(GCC, test "$GCC" = yes)   # let the Makefile know if we're gcc
AC_CANONICAL_HOST

# MinGW uses autoconf, but also needs the windows shim routines
# (since it doesn't have its own support for, say, pthreads).
# This requires us to #include a special header file, and also to
# link in some windows versions of .o's instead of the unix versions.
AH_BOTTOM([
#if defined( __MINGW32__) || defined(__MINGW64__)
#include "windows/port.h"
#endif
])
# Populate $host_cpu, $host_os, etc.
AC_CANONICAL_HOST
case $host_os in
  *mingw*)
    # Disabling fast install keeps libtool from creating wrapper scripts
    # around the executables it builds.  Such scripts have caused failures on
    # MinGW.  Using this option means an extra link step is executed during
    # "make install".
    AC_DISABLE_FAST_INSTALL
    # /tmp is a mount-point in mingw, and hard to use.  use cwd instead
    TEST_TMPDIR=gflags_testdir
    ;;
    *)
    AC_ENABLE_FAST_INSTALL
    TEST_TMPDIR=/tmp/gflags
    ;;
esac
AC_SUBST(TEST_TMPDIR)

# Uncomment this if you'll be exporting libraries (.so's)
AC_PROG_LIBTOOL
AC_SUBST(LIBTOOL_DEPS)
AC_SUBST(SO_VERSION)

# 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([fnmatch.h])
AC_CHECK_HEADERS([sys/stat.h])
AC_CHECK_HEADERS([unistd.h])

# 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(__int16, ac_cv_have___int16=1, ac_cv_have___int16=0)

AC_CHECK_FUNCS([strtoll strtoq])

AX_C___ATTRIBUTE__
# We only care about __attribute__ ((unused))
if test x"$ac_cv___attribute__" = x"yes"; then
  ac_cv___attribute__unused="__attribute__ ((unused))"
else
  ac_cv___attribute__unused=
fi

ACX_PTHREAD

# 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)

# Solaris 10 6/06 has a bug where /usr/sfw/lib/libstdc++.la is empty.
# If so, we replace it with our own version.
LIBSTDCXX_LA_LINKER_FLAG=
if test -f /usr/sfw/lib/libstdc++.la && ! test -s /usr/sfw/lib/libstdc++.la
then
  LIBSTDCXX_LA_LINKER_FLAG='-L$(top_srcdir)/src/solaris'
fi
AC_SUBST(LIBSTDCXX_LA_LINKER_FLAG)

# These are what's needed by gflags.h.in
AC_SUBST(ac_google_start_namespace)
AC_SUBST(ac_google_end_namespace)
AC_SUBST(ac_google_namespace)
AC_SUBST(ac_cv___attribute__unused)
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_uint16_t)
AC_SUBST(ac_cv_have_u_int16_t)
AC_SUBST(ac_cv_have___int16)

## Check out ../autoconf/ for other macros you can call to do useful stuff

# For windows, this has a non-trivial value (__declspec(export)), but any
# system that uses configure wants this to be the empty string.
AC_DEFINE(GFLAGS_DLL_DECL,,
          [Always the empty-string on non-windows systems.
           On windows, should be "__declspec(dllexport)".
	   This way, when we compile the dll, we export our functions/classes.
	   It's safe to define this here because config.h is only used
	   internally, to compile the DLL, and every DLL source file
	   #includes "config.h" before anything else.])

# Write generated configuration file, and also .h files
AC_CONFIG_FILES([Makefile
                 src/gflags/gflags.h src/gflags/gflags_declare.h
                 src/gflags/gflags_completions.h])
AC_OUTPUT