py/mkrules: fix pipe command failure on windows.

GeorgeCGV · GeorgeCGV · commit 5f176ff7a89c · 2022-09-28T21:14:34.000+02:00
Piped commands fail when forward slash is used with
executable. For example: `echo a | C:/gcc/bin/gcc.exe`
fails with the following error:

'C:' is not recognized as an internal or external
command, operable program or batch file.

Converting path to backslash avoids the error.

Signed-off-by: Georgij Cernysiov &lt;geo.cgv@gmail.com&gt;
diff --git a/py/mkrules.cmake b/py/mkrules.cmake
@@ -16,6 +16,12 @@ set(MICROPY_ROOT_POINTERS_COLLECTED "${MICROPY_GENHDR_DIR}/root_pointers.collect
 set(MICROPY_ROOT_POINTERS "${MICROPY_GENHDR_DIR}/root_pointers.h")
 
 if(CMAKE_HOST_WIN32)
+  # On Windows piped commands fail when forward slash is used with executable.
+  #
+  # For example: `echo a | C:/gcc/bin/gcc.exe` fails with the following error:
+  # 'C:' is not recognized as an internal or external command, operable program or batch file.
+  # Converting path to backslash avoids the error.
+  string(REGEX REPLACE "/" "\\\\" CMAKE_C_COMPILER ${CMAKE_C_COMPILER})
   # CMD requires additional escapes for CMD
   set(MICROPY_QSTRDEFS_PREPROCESS_SED0 "s/^^Q(.*)/\"^&\"/")
   set(MICROPY_QSTRDEFS_PREPROCESS_SED1 "s/^^\\\"\\(Q(.*)\\)\\\"/\\1/")
