[Scons-users] Don't understand why scons doesn't rebuild my program

[Dirk Bächle]

Hi Andrew,

I apologize in advance for asking such a seemingly stupid question, but 
do you change your code in a way that really changes its behaviour?
Since SCons usually does its change detection based on MD5 sums, it 
wouldn't relink your newer object files after you've only edited 
comments. SCons would see that the linking inputs didn't change their 
content signatures...and stop right there with nothing further to do.

 From your current description of the problem this might be the case, 
can you confirm?
Else, I would try to look into this some more...

Final questions:

1. How exactly do you call "scons"? Is the problem the same for "scons" 
and "scons install" ?
2. Have you tried to specify your program target explicitly on the 
command-line as in

     scons mp0

?

Best regards,

Dirk


On 04.10.2013 11:59, Andrew McLean wrote:

> I will append my simple SConstruct file, and  an 'opts.py' which it 

> includes.

> If I do 'scons -c' and 'scons' it compiles the source and builds the 

> executable

> as expected.

> But if I then edit the source and do 'scons', it recompiles, but 

> doesn't go on

> to rebuild the executable, even though the .o file is now newer than the

> executable.

> How do I make that dependency work ?

> TIA...

> AM

> ------------------------------------------------

> #!/usr/bin/env python

> # SCONS control file for the PA Program

>

> # Import shared opts

> import AM_opts

>

> # Create Environment for building normal programs

> env = Environment(CPPPATH = ['.'])

> AM_opts.add_opts(env)

> env.Append(CCFLAGS=['-O3'])

>

> # Create Environment for the debug program

> dbg = env.Clone()

> dbg.Append(CCFLAGS=['-DDEBUG', '-g', '-O0'])

>

> Repository('/home/andrew/src/include')

>

> m2o   = env.Object('mbprint.o',  'mbprint.c')

> m2to  = dbg.Object('mbprint.to', 'mbprint.c')

>

> # ol4 makes MBPRINT

> ol4  = m2o

> # Now the T versions...

> ol4t = m2to

>

> # Programs

> mp0  = env.Program('mp0', ol4,  LIBS=['Xext', 'X11', 'm', 'jpeg', 

> 'pthread', 'mb'], LIBPATH=['/usr/local/lib'])

> mp0t  = dbg.Program('mp0t', ol4t,  LIBS=['Xext', 'X11', 'm', 'jpeg', 

> 'pthread', 'mbt'], LIBPATH=['/usr/local/lib'])

>

> # Installation

> im0 = env.Install('/usr/local/bin', mp0)

> im0t = dbg.Install('/usr/local/bin', mp0t)

>

> ----------------------------------------------------------

> # AM's scons_funcs.py.

>

> def add_opts(env):

>     env['STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME']=1

> env.Append(CCFLAGS=['-Wall','-Wno-unused','-W','-ggdb3','--fast-math','-march=core2']) 

>

>     env.Append(CCFLAGS=['-D_GNU_SOURCE', '-pthread'])

>

> env.Alias('install', [im0, im0t])

>

>

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