# ===========================================================================

#  https://www.gnu.org/software/autoconf-archive/ax_check_enable_debug.html

# ===========================================================================

#

# SYNOPSIS

#

#   AX_CHECK_ENABLE_DEBUG([enable by default=yes/info/profile/no], [ENABLE DEBUG VARIABLES ...], [DISABLE DEBUG VARIABLES NDEBUG ...], [IS-RELEASE])

#

# DESCRIPTION

#

#   Check for the presence of an --enable-debug option to configure, with

#   the specified default value used when the option is not present.  Return

#   the value in the variable $ax_enable_debug.

#

#   Specifying 'yes' adds '-g -O0' to the compilation flags for all

#   languages. Specifying 'info' adds '-g' to the compilation flags.

#   Specifying 'profile' adds '-g -pg' to the compilation flags and '-pg' to

#   the linking flags. Otherwise, nothing is added.

#

#   Define the variables listed in the second argument if debug is enabled,

#   defaulting to no variables.  Defines the variables listed in the third

#   argument if debug is disabled, defaulting to NDEBUG.  All lists of

#   variables should be space-separated.

#

#   If debug is not enabled, ensure AC_PROG_* will not add debugging flags.

#   Should be invoked prior to any AC_PROG_* compiler checks.

#

#   IS-RELEASE can be used to change the default to 'no' when making a

#   release.  Set IS-RELEASE to 'yes' or 'no' as appropriate. By default, it

#   uses the value of $ax_is_release, so if you are using the AX_IS_RELEASE

#   macro, there is no need to pass this parameter.

#

#     AX_IS_RELEASE([git-directory])

#     AX_CHECK_ENABLE_DEBUG()

#

# LICENSE

#

#   Copyright (c) 2011 Rhys Ulerich <rhys.ulerich@gmail.com>

#   Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>

#

#   Copying and distribution of this file, with or without modification, are

#   permitted in any medium without royalty provided the copyright notice

#   and this notice are preserved.

#serial 8

AC_DEFUN([AX_CHECK_ENABLE_DEBUG],[

    AC_BEFORE([$0],[AC_PROG_CC])dnl

    AC_BEFORE([$0],[AC_PROG_CXX])dnl

    AC_BEFORE([$0],[AC_PROG_F77])dnl

    AC_BEFORE([$0],[AC_PROG_FC])dnl

    AC_MSG_CHECKING(whether to enable debugging)

    ax_enable_debug_default=m4_tolower(m4_normalize(ifelse([$1],,[no],[$1])))

    ax_enable_debug_is_release=m4_tolower(m4_normalize(ifelse([$4],,

                                                              [$ax_is_release],

                                                              [$4])))

    # If this is a release, override the default.

    AS_IF([test "$ax_enable_debug_is_release" = "yes"],

      [ax_enable_debug_default="no"])

    m4_define(ax_enable_debug_vars,[m4_normalize(ifelse([$2],,,[$2]))])

    m4_define(ax_disable_debug_vars,[m4_normalize(ifelse([$3],,[NDEBUG],[$3]))])

    AC_ARG_ENABLE(debug,

        [AS_HELP_STRING([--enable-debug=]@<:@yes/info/profile/no@:>@,[compile with debugging])],

        [],enable_debug=$ax_enable_debug_default)

    # empty mean debug yes

    AS_IF([test "x$enable_debug" = "x"],

      [enable_debug="yes"])

    # case of debug

    AS_CASE([$enable_debug],

      [yes],[

        AC_MSG_RESULT(yes)

        CFLAGS="${CFLAGS} -g -O0"

        CXXFLAGS="${CXXFLAGS} -g -O0"

        FFLAGS="${FFLAGS} -g -O0"

        FCFLAGS="${FCFLAGS} -g -O0"

        OBJCFLAGS="${OBJCFLAGS} -g -O0"

      ],

      [info],[

        AC_MSG_RESULT(info)

        CFLAGS="${CFLAGS} -g"

        CXXFLAGS="${CXXFLAGS} -g"

        FFLAGS="${FFLAGS} -g"

        FCFLAGS="${FCFLAGS} -g"

        OBJCFLAGS="${OBJCFLAGS} -g"

      ],

      [profile],[

        AC_MSG_RESULT(profile)

        CFLAGS="${CFLAGS} -g -pg"

        CXXFLAGS="${CXXFLAGS} -g -pg"

        FFLAGS="${FFLAGS} -g -pg"

        FCFLAGS="${FCFLAGS} -g -pg"

        OBJCFLAGS="${OBJCFLAGS} -g -pg"

        LDFLAGS="${LDFLAGS} -pg"

      ],

      [

        AC_MSG_RESULT(no)

        dnl Ensure AC_PROG_CC/CXX/F77/FC/OBJC will not enable debug flags

        dnl by setting any unset environment flag variables

        AS_IF([test "x${CFLAGS+set}" != "xset"],

          [CFLAGS=""])

        AS_IF([test "x${CXXFLAGS+set}" != "xset"],

          [CXXFLAGS=""])

        AS_IF([test "x${FFLAGS+set}" != "xset"],

          [FFLAGS=""])

        AS_IF([test "x${FCFLAGS+set}" != "xset"],

          [FCFLAGS=""])

        AS_IF([test "x${OBJCFLAGS+set}" != "xset"],

          [OBJCFLAGS=""])

      ])

    dnl Define various variables if debugging is disabled.

    dnl assert.h is a NOP if NDEBUG is defined, so define it by default.

    AS_IF([test "x$enable_debug" = "xyes"],

      [m4_map_args_w(ax_enable_debug_vars, [AC_DEFINE(], [,,[Define if debugging is enabled])])],

      [m4_map_args_w(ax_disable_debug_vars, [AC_DEFINE(], [,,[Define if debugging is disabled])])])

    ax_enable_debug=$enable_debug

])