Add missing \ before return inside string.

From-SVN: r3627

gcc/gcc.c

@@ -576,7 +576,7 @@ static int n_default_compilers
 #ifdef LINK_LIBGCC_SPECIAL_1
 /* Have gcc do the search for libgcc.a, but generate -L options as usual.  */
 static char *link_command_spec = "\
-%{!fsyntax-only:
+%{!fsyntax-only: \
  %{!c:%{!M:%{!MM:%{!E:%{!S:ld %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
 			%{r} %{s} %{T*} %{t} %{u*} %{x} %{z}\
 			%{!A:%{!nostdlib:%S}} %{static:}\
@@ -585,7 +585,7 @@ static char *link_command_spec = "\
 #ifdef LINK_LIBGCC_SPECIAL
 /* Have gcc do the search for libgcc.a, and don't generate -L options.  */
 static char *link_command_spec = "\
-%{!fsyntax-only:
+%{!fsyntax-only: \
  %{!c:%{!M:%{!MM:%{!E:%{!S:ld %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
 			%{r} %{s} %{T*} %{t} %{u*} %{x} %{z}\
 			%{!A:%{!nostdlib:%S}} %{static:}\
@@ -593,7 +593,7 @@ static char *link_command_spec = "\
 #else
 /* Use -L and have the linker do the search for -lgcc.  */
 static char *link_command_spec = "\
-%{!fsyntax-only:
+%{!fsyntax-only: \
  %{!c:%{!M:%{!MM:%{!E:%{!S:ld %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
 			%{r} %{s} %{T*} %{t} %{u*} %{x} %{z}\
 			%{!A:%{!nostdlib:%S}} %{static:}\