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+# ===========================================================================
+# http://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 5
+
+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
+])