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/usr/src/gcc-4.9/debian/patches/gdc-config-ml.diff is in gcc-4.9-source 4.9.3-13ubuntu2.

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# DP: config-ml.in: Add D support.

2015-04-30  Matthias Klose  <doko@ubuntu.com>

        * config-ml.in: Add D support: treat GDC and GDCFLAGS like other
        compiler/flag environment variables.

Index: b/src/config-ml.in
===================================================================
--- a/src/config-ml.in
+++ b/src/config-ml.in
@@ -506,6 +506,7 @@ multi-do:
 				GCJFLAGS="$(GCJFLAGS) $${flags}" \
 				GOCFLAGS="$(GOCFLAGS) $${flags}" \
 				CXXFLAGS="$(CXXFLAGS) $${flags}" \
+				DFLAGS="$(DFLAGS) $${flags}" \
 				LIBCFLAGS="$(LIBCFLAGS) $${flags}" \
 				LIBCXXFLAGS="$(LIBCXXFLAGS) $${flags}" \
 				LDFLAGS="$(LDFLAGS) $${flags}" \
@@ -738,7 +739,7 @@ if [ -n "${multidirs}" ] && [ -z "${ml_n
         break
       fi
     done
-    ml_config_env='CC="${CC_}$flags" CXX="${CXX_}$flags" F77="${F77_}$flags" GCJ="${GCJ_}$flags" GFORTRAN="${GFORTRAN_}$flags" GOC="${GOC_}$flags"'
+    ml_config_env='CC="${CC_}$flags" CXX="${CXX_}$flags" F77="${F77_}$flags" GCJ="${GCJ_}$flags" GFORTRAN="${GFORTRAN_}$flags" GOC="${GOC_}$flags" GDC="${GDC_}$flags"'
 
     if [ "${with_target_subdir}" = "." ]; then
 	CC_=$CC' '
@@ -747,6 +748,7 @@ if [ -n "${multidirs}" ] && [ -z "${ml_n
 	GCJ_=$GCJ' '
 	GFORTRAN_=$GFORTRAN' '
 	GOC_=$GOC' '
+	GDC_=$GDC' '
     else
 	# Create a regular expression that matches any string as long
 	# as ML_POPDIR.
@@ -823,6 +825,18 @@ if [ -n "${multidirs}" ] && [ -z "${ml_n
 	  esac
 	done
 
+	GDC_=
+	for arg in ${GDC}; do
+	  case $arg in
+	  -[BIL]"${ML_POPDIR}"/*)
+	    GDC_="${GDC_}"`echo "X${arg}" | sed -n "s/X\\(-[BIL]${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X-[BIL]${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  "${ML_POPDIR}"/*)
+	    GDC_="${GDC_}"`echo "X${arg}" | sed -n "s/X\\(${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  *)
+	    GDC_="${GDC_}${arg} " ;;
+	  esac
+	done
+
 	if test "x${LD_LIBRARY_PATH+set}" = xset; then
 	  LD_LIBRARY_PATH_=
 	  for arg in `echo "$LD_LIBRARY_PATH" | tr ':' ' '`; do