[build] Minor fixes for Windows and OS X.

radio/src/CMakeLists.txt

@@ -471,7 +471,8 @@ if(NOT MSVC)
       WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
     )
 
-    if (BASH)
+    find_program(GAWK gawk HINTS "c:/cygwin/bin/" "c:/msys/bin/" DOC "gawk for firmware size report.")  # OS X might only have "awk"
+    if (BASH AND GAWK)
       add_custom_target(firmware-size
         COMMAND ${BASH} -kc '${RADIO_DIRECTORY}/util/elf-size-report.sh --mcu=${CPU_TYPE_FULL} ${SIZE_TARGET_MEM_DEFINE} firmware.elf'
         DEPENDS firmware
@@ -498,7 +499,7 @@ if(NOT MSVC)
     include_directories(storage gui/${GUI_DIR})
 
     set(ALLSRC ${PROJECT_BINARY_DIR}/allsrc.cpp)
-    if (BASH)
+    if (BASH AND NOT WIN32)
       add_custom_command(
         OUTPUT ${ALLSRC}
         COMMAND ${BASH} -kc 'rm -f ${ALLSRC}\; for f in ${SRC}\; do echo "\\# 1 \"$$f\"" >> allsrc.cpp\; cat "$$f" >> ${ALLSRC}\; done'

radio/util/elf-size-report.sh

@@ -63,12 +63,13 @@ for i in "$@" ; do
   esac
 done
 
-# -- prefer gawk to awk if installed
-which gawk 2>&1 > /dev/null
-if [[ $? == 0 ]]; then
-    AWKCMD="gawk -nf"
+# -- make sure gawk is installed
+: ${AWKCMD:=""}
+if gawk --version >/dev/null 2>&1; then
+  [[ "$OSTYPE" == "darwin"* ]] && AWKCMD="gawk -nf"
 else
-    AWKCMD="awk -nf"
+  echo "GAWK is required, exiting."
+  exit 1
 fi
 
 # -- defaults which may change based on MCU