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msbuild fails and returns 1 when when I assign stdout and stdout to os.devnull, returns 0 otherwise
from subprocess import call
import os
import tempfile
import sys


def main():

    temp_repo_name = 'temprepo'
    d = tempfile.mkdtemp()
    os.chdir(os.path.normpath(d))

    command1 = ['hg', 'clone', r'C:temp1jxg_hcr', temp_repo_name]

    devnull = open(os.devnull,'w')

    rc1 = call(command1,stdout=devnull, stderr=devnull)

    if rc1 != 0:
        print('could not clone repo into temporary directory.  Terminating Program')
        sys.exit(1)

    devnull.close()

    devnull = open(os.devnull,'w')

    os.chdir(temp_repo_name)

    command2 = [r'msbuild', r'hcr_dll.sln', r'/t:Rebuild',r'/p:Configuration=Release']
    rc2 = call(command2,stdout=devnull, stderr=devnull)

    print rc2
    if rc2 != 0:
        print('could not build repo.  Terminating Program')
        sys.exit(1)

    devnull.close()

if __name__ == '__main__':
    main()

C:programmingeclipse_workspacehcr_cli_build>python hcr_cli_build.py
0
1
could not build repo.  Terminating Program

rc2 = call(command2)

0
<bunch of build output>
0

#!/bin/bash
for i in 1 2 3 4
 do
  echo "doing $i"
  msbuild.exe /c/temp/$i/jxg_hcr/hcr_dll.sln //t:Rebuild //p:Configuration=Release
  echo $?
 done

#!/bin/bash
for i in 1 2 3 4
 do
  echo "doing $i"
  msbuild.exe /c/temp/$i/jxg_hcr/hcr_dll.sln //t:Rebuild //p:Configuration=Release > /dev/null
  echo $?
 done