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/usr/src/gcc-8/debian/patches/gdc-driver-nophobos.diff is in gcc-8-source 8-20180414-1ubuntu2.

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# DP: Modify gdc driver to have no libphobos by default.

Index: b/src/gcc/d/d-lang.cc
===================================================================
--- a/src/gcc/d/d-lang.cc
+++ b/src/gcc/d/d-lang.cc
@@ -309,7 +309,7 @@ static void
 d_init_options_struct (gcc_options *opts)
 {
   /* GCC options.  */
-  opts->x_flag_exceptions = 1;
+  opts->x_flag_exceptions = 0;
 
   /* Avoid range issues for complex multiply and divide.  */
   opts->x_flag_complex_method = 2;
Index: b/src/gcc/d/d-spec.c
===================================================================
--- a/src/gcc/d/d-spec.c
+++ b/src/gcc/d/d-spec.c
@@ -60,7 +60,7 @@ static int library = 0;
 
 /* If true, use the standard D runtime library when linking with
    standard libraries. */
-static bool need_phobos = true;
+static bool need_phobos = false;
 
 void
 lang_specific_driver (cl_decoded_option **in_decoded_options,