[nrf toup] Test: Build: Don't put host filepaths into firmware

Replace the path of tf-m-tests repo with the literal
"TFM_TEST_REPO_PATH" in C preprocessor macro expansions to prevent
host file path information from leaking into __FILE__ macros and
breaking reproducible builds.

Signed-off-by: Sebastian Bøe <[email protected]>
(cherry picked from commit a9bbcff)

Author: SebastianBoe

CMakeLists.txt

@@ -81,6 +81,14 @@ add_subdirectory(tools)
 add_subdirectory(secure_fw)
 
 if(NS OR TFM_S_REG_TEST OR TFM_NS_REG_TEST OR TEST_BL2 OR TEST_BL1_1 OR TEST_BL1_2)
+    # Replace the path of the tf-m-tests repo with the literal
+    # "TFM_TEST_REPO_PATH" in C preprocessor macro expansions to
+    # prevent host file path information from leaking into __FILE__
+    # macros and breaking reproducible builds.
+    add_compile_options(
+      -fmacro-prefix-map=${TFM_TEST_REPO_PATH}=TFM_TEST_REPO_PATH
+      )
+
     add_subdirectory(${TFM_TEST_REPO_PATH} ${CMAKE_CURRENT_BINARY_DIR}/tf-m-tests)
 endif()