[nrf temphack]: Limit number of parallel jobs for TF-M build to 1

Fixes: NCSDK-10008

Set number of parallel jobs for TF-M build to 1.
In some circumstances it has been experienced that building TF-M with
multiple parallel jobs then `permission denied` may occur.
Root cause on Windows has not been identified but current suspicion
is around folder / file lock mechanism. To ensure correct behaviour
in all cases, limit number of parallel jobs to 1.

This issue is especially experienced when building TF-M through SES-NE.

This fix should be reverted when the root cause has been identified and
fixed.

Signed-off-by: Torsten Rasmussen <[email protected]>

Author: tejlmand

modules/trusted-firmware-m/CMakeLists.txt

@@ -224,12 +224,22 @@ function(trusted_firmware_build)
 
   include(ExternalProject)
 
+  if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL Windows)
+    # Set number of parallel jobs for TF-M build to 1.
+    # In some circumstances it has been experienced that building TF-M with
+    # multiple parallel jobs then `permission denied` may occur. Root cause on
+    # Windows has not been identified but current suspicion is around folder /
+    # file lock mechanism. To ensure correct behaviour in all cases, limit
+    # number of parallel jobs to 1.
+    set(PARALLEL_JOBS -j 1)
+  endif()
+
   ExternalProject_Add(
     tfm
     SOURCE_DIR ${ZEPHYR_TRUSTED_FIRMWARE_M_MODULE_DIR}/trusted-firmware-m
     BINARY_DIR ${TFM_BINARY_DIR}
     CONFIGURE_COMMAND ""
-    BUILD_COMMAND ${CMAKE_COMMAND} --build .
+    BUILD_COMMAND ${CMAKE_COMMAND} --build . ${PARALLEL_JOBS}
     INSTALL_COMMAND ${CMAKE_COMMAND} --install .
     BUILD_ALWAYS True
     USES_TERMINAL_BUILD True