Fix unwanted build step for nobuild target // Resolve platformio#355, resolve platformio#356

Author: valeros

builder/main.py

@@ -210,7 +210,7 @@ def __fetch_spiffs_size(target, source, env):
 # Target: Build executable and linkable firmware or SPIFFS image
 #
 
-target_elf = env.BuildProgram()
+target_elf = None
 if "nobuild" in COMMAND_LINE_TARGETS:
     target_elf = join("$BUILD_DIR", "${PROGNAME}.elf")
     if set(["uploadfs", "uploadfsota"]) & set(COMMAND_LINE_TARGETS):
@@ -219,6 +219,7 @@ def __fetch_spiffs_size(target, source, env):
     else:
         target_firm = join("$BUILD_DIR", "${PROGNAME}.bin")
 else:
+    target_elf = env.BuildProgram()
     if set(["buildfs", "uploadfs", "uploadfsota"]) & set(COMMAND_LINE_TARGETS):
         target_firm = env.DataToBin(
             join("$BUILD_DIR", "${ESP32_SPIFFS_IMAGE_NAME}"), "$PROJECTDATA_DIR")