Added recipe.hooks feature to override gcc options

Fix stm32duino#41

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

platform.txt

@@ -30,7 +30,7 @@ compiler.c.elf.cmd=arm-none-eabi-gcc
 compiler.objcopy.cmd=arm-none-eabi-objcopy
 compiler.elf2hex.cmd=arm-none-eabi-objcopy
 
-compiler.extra_flags=-mcpu={build.mcu} -DF_CPU={build.f_cpu} -mthumb
+compiler.extra_flags=-mcpu={build.mcu} -DF_CPU={build.f_cpu} -mthumb @{build.path}/build.opt
 
 compiler.S.flags={compiler.extra_flags} -c -x assembler-with-cpp {compiler.stm.extra_include}
 
@@ -78,6 +78,9 @@ build.enable_usb=
 build.flags.optimize=
 build.flags.ldspecs=
 
+## Pre and post build hooks
+recipe.hooks.prebuild.1.pattern={tools.build_opt.path}/{tools.build_opt.cmd} {build.project_name} {build.source.path} {build.path}
+
 # compile patterns
 # ---------------------
 
@@ -109,6 +112,18 @@ recipe.size.regex=^(?:\.text|\.data|\.rodata)\s+([0-9]+).*
 recipe.size.regex.data=^(?:\.data|\.bss|\._user_heap_stack)\s+([0-9]+).*
 recipe.size.regex.eeprom=^(?:\.eeprom)\s+([0-9]+).*
 
+# Recipe tools
+# -------------------
+
+# Copy build_opt file
+tools.build_opt.cmd=build_opt
+tools.build_opt.cmd.windows=build_opt.bat
+tools.build_opt.cmd.macosx=build_optMacOsX
+tools.build_opt.path={runtime.hardware.path}/tools/win
+tools.build_opt.path.macosx={runtime.hardware.path}/tools/macosx
+tools.build_opt.path.linux={runtime.hardware.path}/tools/linux
+tools.build_opt.path.linux64={runtime.hardware.path}/tools/linux
+
 
 # Uploader tool
 # -------------------