feat: shorten __FILE__

Append -fmacro-prefix-map option to change __FILE__
absolute path of the board platform folder to a
relative path by using '.'.
(i.e. the folder containing boards.txt)

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

platform.txt

@@ -120,9 +120,9 @@ build.opt.path={build.path}/sketch/{build.opt.name}
 
 extras.path={build.system.path}/extras
 
-# Create empty {build.opt} if not exists in the output sketch dir and force include of SrcWrapper library
-recipe.hooks.prebuild.1.pattern="{extras.path}/prebuild.sh" "{build.path}" "{build.source.path}"
-recipe.hooks.prebuild.1.pattern.windows="{runtime.tools.STM32Tools.path}/win/busybox.exe" sh "{extras.path}/prebuild.sh" "{build.path}" "{build.source.path}"
+# Create {build.opt} if not exists in the output sketch dir and force include of SrcWrapper library
+recipe.hooks.prebuild.1.pattern="{extras.path}/prebuild.sh" "{build.path}" "{build.source.path}" "{runtime.platform.path}"
+recipe.hooks.prebuild.1.pattern.windows="{runtime.tools.STM32Tools.path}/win/busybox.exe" sh "{extras.path}/prebuild.sh" "{build.path}" "{build.source.path}" "{runtime.platform.path}"
 
 # compile patterns
 # ---------------------

system/extras/prebuild.sh

@@ -2,6 +2,7 @@
 
 BUILD_PATH="$1"
 BUILD_SOURCE_PATH="$2"
+BOARD_PLATFORM_PATH="$3"
 
 # Create sketch dir if not exists
 if [ ! -f "$BUILD_PATH/sketch" ]; then
@@ -18,5 +19,10 @@ else
   cp "$BUILD_SOURCE_PATH/build_opt.h" "$BUILD_PATH/sketch/build.opt"
 fi
 
+# Append -fmacro-prefix-map option to change __FILE__ absolute path of the board
+# platform folder to a relative path by using '.'.
+# (i.e. the folder containing boards.txt)
+printf '\n-fmacro-prefix-map=%s=.' "${BOARD_PLATFORM_PATH//\\/\\\\}" > "$BUILD_PATH/sketch/build.opt"
+
 # Force include of SrcWrapper library
 echo "#include <SrcWrapper.h>" > "$BUILD_PATH/sketch/SrcWrapper.cpp"