gcc: Support Canadian cross builds on microblazeel

Picolibc uses the linker during the build process to construct crt0.o
files, but the microblazeel spec from gcc adds -dT xilinx.ld when no
-T argument is provided to introduce default linking
parameters. However, during a Canadian cross build, the xilinx.ld file
isn't installed before picolibc gets built causing the build to fail.

Fix this by not using xilinx.ld when the -r flag is selected.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

gcc/config/microblaze/microblaze.h

@@ -110,7 +110,7 @@ extern enum pipeline_type microblaze_pipe;
   %{Zxl-mode-xmdstub:-defsym _TEXT_START_ADDR=0x800} \
   %{mxl-mode-xmdstub:-defsym _TEXT_START_ADDR=0x800} \
   %{mxl-gp-opt:%{G*}} %{!mxl-gp-opt: -G 0} \
-  %{!T*: -dT xilinx.ld%s}"
+  %{!r:%{!T*: -dT xilinx.ld%s}}"
 
 /* Specs for the compiler proper  */