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

#         http://autoconf-archive.cryp.to/ax_check_enable_debug.html

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

#

# SYNOPSIS

#

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

#   allow/avoid compiled debugging flags appropriately.

#

#   AX_CHECK_ENABLE_DEBUG([enable by default=yes/info/profile/no],

#                         [ENABLE DEBUG VARIABLES …],

#                         [DISABLE DEBUG VARIABLES NDEBUG …])

#

# 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.

#

# LAST MODIFICATION

#

#   2014-05-12

#

# COPYLEFT

#

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

#   Copyright © 2014 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.

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)

    m4_define(ax_enable_debug_default,[m4_tolower(m4_normalize(ifelse([$1],,[no],[$1])))])

    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]@<:@=ax_enable_debug_default@:>@,[compile with debugging; one of yes/info/profile/no])],

        [],enable_debug=ax_enable_debug_default)

    if test "x$enable_debug" = "xyes" || test "x$enable_debug" = "x"; then

        AC_MSG_RESULT(yes)

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

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

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

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

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

        dnl Define various variables if debugging is enabled.

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

    else

        if test "x$enable_debug" = "xinfo"; then

            AC_MSG_RESULT(info)

            CFLAGS="${CFLAGS} -g"

            CXXFLAGS="${CXXFLAGS} -g"

            FFLAGS="${FFLAGS} -g"

            FCFLAGS="${FCFLAGS} -g"

            OBJCFLAGS="${OBJCFLAGS} -g"

        elif test "x$enable_debug" = "xprofile"; then

            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"

        else

            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

            if test "x${CFLAGS+set}" != "xset"; then

                CFLAGS=""

            fi

            if test "x${CXXFLAGS+set}" != "xset"; then

                CXXFLAGS=""

            fi

            if test "x${FFLAGS+set}" != "xset"; then

                FFLAGS=""

            fi

            if test "x${FCFLAGS+set}" != "xset"; then

                FCFLAGS=""

            fi

            if test "x${OBJCFLAGS+set}" != "xset"; then

                OBJCFLAGS=""

            fi

        fi

        dnl Define various variables if debugging is disabled.

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

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

    fi

    ax_enable_debug=$enable_debug

])