Fix various typos in CMake CONFIG lines. Also add a script that found some of these errors. (#907)

tools/CMakeLists.txt

@@ -4,7 +4,7 @@ function(_pico_init_pioasm)
     find_package(Pioasm REQUIRED)
 endfunction()
 
-# PICO_DEFAULT_PIOASM_OUTPUT_FORMAT, default output format used by pioasm when using pico_generate_pio_header, default=c-sdk, group=build
+# PICO_CMAKE_CONFIG: PICO_DEFAULT_PIOASM_OUTPUT_FORMAT, default output format used by pioasm when using pico_generate_pio_header, default=c-sdk, group=build
 function(pico_generate_pio_header TARGET PIO)
     _pico_init_pioasm()
     cmake_parse_arguments(pico_generate_pio_header "" "OUTPUT_FORMAT;OUTPUT_DIR" "" ${ARGN} )

tools/check_configs.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+# Little script to find possibly-misnamed CONFIG lines
+for CONF in PICO_CONFIG PICO_CMAKE_CONFIG PICO_BUILD_DEFINE; do
+  for DEF in $(git grep "$CONF:" | sed -n "s/.*$CONF: \+\(\w\+\).*/\1/p"); do
+    if [ $(git grep "$DEF" | wc -l) -lt 2 ]; then
+        echo "$CONF: $DEF only appears once"
+    fi
+  done
+done