Is it possible to display compiler warnings in Arduino?

Question

I would like the Arduino IDE to display compiler warnings, and I would rather not have to compile once in the terminal for warnings, and again through Arduino to generate th

Answer 1

The feature as described @Matthew, not only displays the warnings, but a lot of distracting information on how the compiler was called as well.

See the addendum to my question Have Arduino IDE set compiler warnings to error implement the changes to the arduino script:

-export PATH="${APPDIR}/java/bin:${PATH}"
+export ORGPATH="${APPDIR}/java/bin:${PATH}"
+export PATH="${APPDIR}/extra:${ORGPATH}"

and make the extra/avr-g++:

#! /usr/bin/env python

import os
import sys
import subprocess

checklibpat = [
    'SoftwareSerial',
    'GSM_GPRS',
]

werr = '-Werror'
wall = '-Wall'

cmd = ['avr-g++'] + sys.argv[1:]
os.environ['PATH'] = os.environ['ORGPATH']
fname = sys.argv[-2][:]
extend = False
warn = False
if cmd[-2].startswith('/tmp'):
    extend = True
    warn = True
if not extend:
    for l in checklibpat:
        if l in cmd[-2]:
            warn = True
            break
if warn:
    #print len(fname), list(fname)
    for i, c in enumerate(cmd):
        if c == '-w':
            cmd[i] = wall
            break
    if extend:
        cmd.insert(1, werr)
## to enable deprecated stuff (Print.cpp) with gcc 4.7.0
#cmd.insert(1, '-D__PROG_TYPES_COMPAT__=1')
subprocess.call(cmd)

Comment out extend = True if you do not want the compiler to interpret warnings in your source as errors.