Issue: using Replace to replace ENV PATH

Hello all.

I am a new SCons user as well as new to Open Source development in general, so please forgive me if I'm missing some etiquette with this mail, but I have a minor issue when using the Replace method to replace ENV PATH as follows:


PATH = {'PATH' : ['C:/cygwin/bin']}

env = Environment()

env.Replace(ENV = PATH)

env.Replace(CXX = 'g++')

env.Replace(CC = 'gcc')

print "PATH = ", env['ENV']

print "CXX = ", env['CXX']

print "CC = ", env['CC']

env.Program('helloworld.cxx')
gives:

scons: warning: No version of Visual Studio compiler found - C/C++ compilers most likely not set correctly

File "D:\tony\SConstruct", line 2, in <module>

PATH =  {'PATH': ['C:/cygwin/bin']}

CXX =  g++

CC =  gcc



scons: warning: No version of Visual Studio compiler found - C/C++ compilers most likely not set correctly

File "C:\Python27\Scripts\scons.py", line 204, in <module>

g++ /Fohelloworld.obj /c helloworld.cxx /TP /nologo

g++: error: /Fohelloworld.obj: No such file or directory

g++: error: /c: No such file or directory

g++: error: /TP: No such file or directory

g++: error: /nologo: No such file or directory

scons: *** [helloworld.obj] Error 1

Whereas:

PATH = {'PATH' : ['C:/cygwin/bin']}

env = Environment(ENV = PATH)

# env.Replace()

env.Replace(CXX = 'g++')

env.Replace(CC = 'gcc')

print "PATH = ", env['ENV']

print "CXX = ", env['CXX']

print "CC = ", env['CC']

env.Program('helloworld.cxx')
gives:

scons: Reading SConscript files ...

PATH =  {'PATH': ['C:/cygwin/bin']}

CXX =  g++

CC =  gcc

scons: done reading SConscript files.

scons: Building targets ...



scons: warning: No version of Visual Studio compiler found - C/C++ compilers most likely not set correctly

File "C:\Python27\Scripts\scons.py", line 204, in <module>

g++ -o helloworld.o -c helloworld.cxx

g++ -o helloworld.exe helloworld.o

scons: done building targets.

I'm not particularly tied to the first implementation, so using the second method suits me just fine. I was just wondering if this is intended, and if so, why?

Regards,
Tony Long.

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