fxsdk: add update command and fix LD flag order

fxsdk/assets/Makefile

@@ -16,8 +16,8 @@ cf-fx     := $(cf) -m3 -DFX9860G
 cf-cg     := $(cf) -m4-nofpu -DFXCG50
 
 # Linker flags
-lf-fx     := $(LDFLAGS) -Tfx9860g.ld -lgint-fx -lgcc -Wl,-Map=build-fx/map
-lf-cg     := $(LDFLAGS) -Tfxcg50.ld  -lgint-cg -lgcc -Wl,-Map=build-cg/map
+lf-fx     := -Tfx9860g.ld -lgint-fx $(LDFLAGS) -lgcc -Wl,-Map=build-fx/map
+lf-cg     := -Tfxcg50.ld  -lgint-cg $(LDFLAGS) -lgcc -Wl,-Map=build-cg/map
 
 dflags     = -MMD -MT $@ -MF $(@:.o=.d) -MP
 cpflags   := -R .bss -R .gint_bss

fxsdk/fxsdk.sh

@@ -39,6 +39,13 @@ Installation:
   Sends the target file to the calculator. Uses p7 (which must be installed
   externally) for fx-9860G. Currently not implemented for fx-CG 50, as it
   requires detecting and mounting the calculator (same of the Graph 35+E II).
+
+Project update:
+  fxsdk update
+
+  Copies the latest version of the Makefile to your project. *This will
+  discard any changes made to your Makefile.* If you have edited your
+  Makefile, make a backup and merge the changes after updating.
 EOF
 )
 
@@ -138,7 +145,8 @@ ICON_CG_SEL = assets-cg/icon-cg-sel.png
 
 # Additional compiler flags
 CFLAGS = -std=c11 -Os
-# Additional linker flags
+# Additional linker flags. This is followed by -lgcc. When using fxlib, add
+# libfx.a to the projet directory and set LDFLAGS to "-L . -lfx".
 LDFLAGS =
 EOF
 }
@@ -222,6 +230,17 @@ fxsdk_send_cg() {
   echo "error: this is tricky and not implemented yet, sorry x_x"
 }
 
+fxsdk_update() {
+  if [[ ! -e "project.cfg" ]]; then
+    echo "No file 'project.cfg' was found. This does not look like an fxSDK"
+    echo "project folder. (Nothing done.)"
+  fi
+
+  assets="$PREFIX/share/fxsdk/assets"
+  cp "$assets"/Makefile .
+  echo "Succesfully copied $assets/Makefile to the current directory."
+}
+
 # Parse command name
 
 case $1 in
@@ -250,6 +269,10 @@ case $1 in
   "send-cg"|"sc"|"scg")
     fxsdk_send_cg;;
 
+  # Project update
+  "update")
+    fxsdk_update;;
+
   # Misc
   -h|--help|-\?)
     usage 0;;