#  compiler all happy.

			flags="$flags -fno-strict-aliasing"

			# Warn about casting-out 'const' with regular C-style cast.

			#  The preferred way is const_cast<>() which doesn't warn.

			flags="$flags -Wcast-qual"

		fi

		if [ $cc_version -ge 42 ]; then

			# GCC 4.2+ automatically assumes that signed overflows do

			# not occur in signed arithmetics, whereas we are not

			# sure that they will not happen. It furthermore complains

			# about its own optimized code in some places.

			flags="$flags -fno-strict-overflow"

			# GCC 4.2 no longer includes -Wnon-virtual-dtor in -Wall.

			# Enable it in order to be consistent with older GCC versions.

			flags="$flags -Wnon-virtual-dtor"

		fi

		if [ $cc_version -ge 43 ]; then

			# Use gnu++0x mode so static_assert() is available.

			# Don't use c++0x, it breaks mingw (with gcc 4.4.0).

			cxxflags="$cxxflags -std=gnu++0x"

		fi

		if [ "$enable_lto" != "0" ]; then

			# GCC 4.5 outputs '%{flto}', GCC 4.6 outputs '%{flto*}'

			has_lto=`$1 -dumpspecs | grep '\%{flto'`

			if [ -n "$has_lto" ]; then

				# Use LTO only if we see LTO exists and is requested

				if [ $cc_version -lt 46 ]; then

					flags="$flags -flto"

				else

					flags="$flags -flto=jobserver"

				fi

				ldflags="$ldflags -fwhole-program"

				features="$features lto"

			fi

		fi

		has_rdynamic=`$1 -dumpspecs | grep rdynamic`

		if [ -n "$has_rdynamic" ]; then

			# rdynamic is used to get useful stack traces from crash reports.

			flags="$flags -rdynamic"

			ldflags="$ldflags -rdynamic"

		fi

	fi

	eval "$2=\"$flags\""