# Citus autoconf input script.
#
# Converted into an actual configure script by autogen.sh. This
# conversion only has to be done when configure.in changes. To avoid
# everyone needing autoconf installed, the resulting files are checked
# into the SCM.

AC_INIT([Citus], [7.0.0])
AC_COPYRIGHT([Copyright (c) 2012-2017, Citus Data, Inc.])

# we'll need sed and awk for some of the version commands
AC_PROG_SED
AC_PROG_AWK

# CITUS_VERSION definition
AC_DEFINE_UNQUOTED(CITUS_VERSION, "$PACKAGE_VERSION", [Citus version as a string])

# CITUS_MAJORVERSION definition
[CITUS_MAJORVERSION=`expr "$PACKAGE_VERSION" : '\([0-9][0-9]*\.[0-9][0-9]*\)'`]
AC_DEFINE_UNQUOTED(CITUS_MAJORVERSION, "$CITUS_MAJORVERSION", [Citus major version as a string])

# CITUS_VERSION_NUM definition
# awk -F is a regex on some platforms, and not on others, so make "." a tab
[CITUS_VERSION_NUM="`echo "$PACKAGE_VERSION" | sed 's/[A-Za-z].*$//' |
tr '.' '	' |
$AWK '{printf "%d%02d%02d", $1, $2, (NF >= 3) ? $3 : 0}'`"]
AC_DEFINE_UNQUOTED(CITUS_VERSION_NUM, $CITUS_VERSION_NUM, [Citus version as a number])

# CITUS_EXTENSIONVERSION definition
[CITUS_EXTENSIONVERSION="`grep '^default_version' $srcdir/src/backend/distributed/citus.control | cut -d\' -f2`"]
AC_DEFINE_UNQUOTED([CITUS_EXTENSIONVERSION], "$CITUS_EXTENSIONVERSION", [Extension version expected by this Citus build])

# Re-check for flex. That allows to compile citus against a postgres
# which was built without flex available (possible because generated
# files are included)
AC_PATH_PROG([FLEX], [flex])

# Locate pg_config binary
AC_ARG_VAR([PG_CONFIG], [Location to find pg_config for target PostgreSQL instalation (default PATH)])
AC_ARG_VAR([PATH], [PATH for target PostgreSQL install pg_config])

if test -z "$PG_CONFIG"; then
  AC_PATH_PROG(PG_CONFIG, pg_config)
fi

if test -z "$PG_CONFIG"; then
   AC_MSG_ERROR([Could not find pg_config. Set PG_CONFIG or PATH.])
fi

# check we're building against a supported version of PostgreSQL
citusac_pg_config_version=$($PG_CONFIG --version 2>/dev/null)
version_num=$(echo "$citusac_pg_config_version"|
              $SED -e 's/^PostgreSQL \([[0-9]]*\)\(\.[[0-9]]*\)\{0,1\}\(.*\)$/\1\2/')

# if PostgreSQL version starts with two digits, the major version is those digits
version_num=$(echo "$version_num"| $SED -e 's/^\([[0-9]]\{2\}\)\(.*\)$/\1/')

if test -z "$version_num"; then
  AC_MSG_ERROR([Could not detect PostgreSQL version from pg_config.])
fi

if test "$version_num" != '9.6' -a "$version_num" != '10'; then
   AC_MSG_ERROR([Citus is not compatible with the detected PostgreSQL version ${version_num}.])
else
   AC_MSG_NOTICE([building against PostgreSQL $version_num])
fi;

# Check whether we're building inside the source tree, if not, prepare
# the build directory.
if test "$srcdir" -ef '.' ; then
  vpath_build=no
else
  vpath_build=yes
  _AS_ECHO_N([preparing build tree... ])
  citusac_abs_top_srcdir=`cd "$srcdir" && pwd`
  $SHELL "$citusac_abs_top_srcdir/prep_buildtree" "$citusac_abs_top_srcdir" "." \
      || AC_MSG_ERROR(failed)
  AC_MSG_RESULT(done)
fi
AC_SUBST(vpath_build)

# Allow to overwrite the C compiler, default to the one postgres was
# compiled with. We don't want autoconf's default CFLAGS though, so save
# those.
SAVE_CFLAGS="$CFLAGS"
AC_PROG_CC([$($PG_CONFIG --cc)])
CFLAGS="$SAVE_CFLAGS"


# Locate source and build directory of the postgres we're building
# against. Can't rely on either still being present, but e.g. optional
# test infrastructure can rely on it.
POSTGRES_SRCDIR=$(grep ^abs_top_srcdir $(dirname $($PG_CONFIG --pgxs))/../Makefile.global|cut -d ' ' -f3-)
POSTGRES_BUILDDIR=$(grep ^abs_top_builddir $(dirname $($PG_CONFIG --pgxs))/../Makefile.global|cut -d ' ' -f3-)


# check for a number of CFLAGS that make development easier

# CITUSAC_PROG_CC_CFLAGS_OPT
# -----------------------
# Given a string, check if the compiler supports the string as a
# command-line option. If it does, add the string to CFLAGS.
AC_DEFUN([CITUSAC_PROG_CC_CFLAGS_OPT],
[define([Ac_cachevar], [AS_TR_SH([citusac_cv_prog_cc_cflags_$1])])dnl
AC_CACHE_CHECK([whether $CC supports $1], [Ac_cachevar],
[citusac_save_CFLAGS=$CFLAGS
CFLAGS="$citusac_save_CFLAGS $1"
ac_save_c_werror_flag=$ac_c_werror_flag
ac_c_werror_flag=yes
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
                   [Ac_cachevar=yes],
                   [Ac_cachevar=no])
ac_c_werror_flag=$ac_save_c_werror_flag
CFLAGS="$citusac_save_CFLAGS"])
if test x"$Ac_cachevar" = x"yes"; then
  CITUS_CFLAGS="$CITUS_CFLAGS $1"
fi
undefine([Ac_cachevar])dnl
])# CITUSAC_PROG_CC_CFLAGS_OPT

CITUSAC_PROG_CC_CFLAGS_OPT([-Wall])
CITUSAC_PROG_CC_CFLAGS_OPT([-Wextra])
# disarm options included in the above, which are too noisy for now
CITUSAC_PROG_CC_CFLAGS_OPT([-Wno-unused-parameter])
CITUSAC_PROG_CC_CFLAGS_OPT([-Wno-sign-compare])
CITUSAC_PROG_CC_CFLAGS_OPT([-Wno-missing-field-initializers])
CITUSAC_PROG_CC_CFLAGS_OPT([-Wno-clobbered])
# And add a few extra warnings
CITUSAC_PROG_CC_CFLAGS_OPT([-Wdeclaration-after-statement])
CITUSAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])
CITUSAC_PROG_CC_CFLAGS_OPT([-Wmissing-format-attribute])
CITUSAC_PROG_CC_CFLAGS_OPT([-Wmissing-declarations])
CITUSAC_PROG_CC_CFLAGS_OPT([-Wmissing-prototypes])

#
# --enable-coverage enables generation of code coverage metrics with gcov
#
AC_ARG_ENABLE([coverage], AS_HELP_STRING([--enable-coverage], [build with coverage testing instrumentation]))
if test "$enable_coverage" = yes; then
    CITUS_CFLAGS="$CITUS_CFLAGS -fprofile-arcs -ftest-coverage"
fi

AC_SUBST(CITUS_CFLAGS, "$CITUS_CFLAGS")
AC_SUBST(POSTGRES_SRCDIR, "$POSTGRES_SRCDIR")
AC_SUBST(POSTGRES_BUILDDIR, "$POSTGRES_BUILDDIR")

AC_CONFIG_FILES([Makefile.global])
AC_CONFIG_HEADERS([src/include/citus_config.h] [src/include/citus_version.h])
AH_TOP([
/*
 * citus_config.h.in is generated by autoconf/autoheader and
 * converted into citus_config.h by configure.  Include when code needs to
 * depend on determinations made by configure.
 *
 * Do not manually edit!
 */
])
AC_OUTPUT