[Scons-users] Running two commands after build

[Gary Oberbrunner]

For the first, use AddPostAction to add the executable-modifying command
(see the man page or users guide).  It'll run that action any time that
target is rebuilt, immediately after it's rebuilt and before building any
further targets that depend on it.

For the second, this is normal SCons: your method should work, though it's
usually better to use the nodes rather than filename strings:
  # Create c2 from c1
  c2 = env.Command('build/test.out.x',c1, 'echo test >> ${TARGET}')


On Tue, Aug 11, 2015 at 8:33 AM, Adam Wysocki <scons at chmurka.net> wrote:

> Hello,
>
> Hi,
>
> I'm trying to use scons as my build environment and I have some problems.
> I use scons 2.3.6 with Python 2.7 on Windows 7 64-bit, but the solution
> should be portable to Linux.
>
> I need to compile and link C++ sources into an executable. That goes fine.
> However, I need to execute two commands after a file has been linked. First
> one (let's call it c1) modifies the generated executable file, second one
> (let's call it c2) generates another file basing on (modified by c1)
> executable file.
>
> Also I need to have separate source and build directories. So the sequence
> is:
>
> - compile src/test/test.cpp to build/test/test.o
> - link build/test/test.o to build/test.out (.out is my executable suffix)
> - execute c1 on build/test.out (build/test.out will be modified)
> - execute c2 on build/test.out (build/test.out will NOT be modified,
>   build/test.out.x will be created)
>
> My simple test environment can be created with:
>
> mkdir build
> mkdir src
> mkdir src\test
> echo int main; > src\test\test.cpp
>
> My sconstruct file for this environment:
>
> ---------------------------------------
> # My executable file suffix is .out
> env = Environment(PROGSUFFIX = '.out')
>
> # I have sources in src directory, but all output should be in build
> directory
> env.VariantDir('build', 'src', duplicate = 0)
>
> # Let's compile the program, it goes fine
> p = env.Program('build/test.out', Glob('build/test/*.cpp'))
>
> # After a program is compiled, I need to modify it's executable
> c1 = env.Command(None, 'build/test.out', 'echo test >> ${TARGET}.out')
>
> # After this executable has been modified, I need to generate new file
> (test.out.x)
> c2 = env.Command('build/test.out.x', 'build/test.out', 'echo test >>
> ${TARGET}')
>
> # Let's add dependencies
> env.Depends(c1, p)
> env.Depends(c2, c1)
> ---------------------------------------
>
> Now how it works and how I expect it will work.
>
> ---------------------------------------
> T:\tmp\scons>scons -Q
> echo test >> build\test.out
> g++ -o build\test\test.o -c src\test\test.cpp
> Assembler messages:
> Fatal error: can't create build\test\test.o: No such file or directory
> scons: *** [build\test\test.o] Error 1
> ---------------------------------------
>
> Two things happened here.
>
> 1. Command "c1" was executed before command "p", but it should be executed
>    after command "p"
>
> 2. scons did not create subdirectory for object files (it does it when c1,
>    c2 and Depends are commented out)
>
> When I create this intermediate directory by hand, all goes fine.
>
> ---------------------------------------
> T:\tmp\scons>mkdir build\test
>
> T:\tmp\scons>scons -Q
> g++ -o build\test\test.o -c src\test\test.cpp
> g++ -o build\test.out build\test\test.o
> echo test >> build\test.out
> echo test >> build\test.out.x
> ---------------------------------------
>
> Which leads to my second problem. When I execute scons once again, command
> c2
> gets executed once again:
>
> ---------------------------------------
> T:\tmp\scons>scons -Q
> echo test >> build\test.out.x
> ---------------------------------------
>
> When I execute scons one more time, it does not execute c2 (which is
> correct):
>
> ---------------------------------------
> T:\tmp\scons>scons -Q
> scons: `.' is up to date.
> ---------------------------------------
>
> Ok, now to my questions.
>
> 1. Is it possible to make scons behave as expected even when no
> intermediate
>    directory for object files is found? Is it a bug in scons, or in my
>    sconstruct file?
>
> 2. Is it possible to make scons execute c2 only one time (so the second
>    invocation will lead to "`.' is up to date")?
>
> Thanks for any feedback!
>
> --
> AW
> _______________________________________________
> Scons-users mailing list
> Scons-users at scons.org
> https://pairlist4.pair.net/mailman/listinfo/scons-users
>



-- 
Gary
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