+++
title = "scons"
draft = false
tags = [
    "code",
    "build",
    "scons"
]
date = "2014-03-24"
+++
# SCons 

  1. [SCons Wiki Frontpage](http://www.scons.org/wiki/FrontPage)
  2. [Single HTML Manpage](http://www.scons.org/doc/HTML/scons-man.html#lbAF)
  3. [SCons Construction Variables](http://www.scons.org/doc/0.96.90/HTML/scons-user/a3061.html) om bvb de compiler te specifiëren. 

### Opsplitsen SConstruct en SConscript 

Waarom? http://www.scons.org/doc/2.1.0/HTML/scons-user/c3356.html

Build output definiëren, duplicate source files, etc. Voorbeeld `SConstruct` file:

```python
SConscript('SConscript', variant_dir######'build', duplicate0)
```

Voorbeeld file om Google Test mee te (proberen) builden `SConscript`:

```python
def Glob( pattern ###### '*.*', dir  '.' ):
    import os, fnmatch
    files = []
    for file in os.listdir( Dir(dir).srcnode().abspath ):
        if fnmatch.fnmatch(file, pattern) :
            files.append( os.path.join( dir, file ) )
    return files

# construction variables: http://www.scons.org/doc/0.96.90/HTML/scons-user/a3061.html
env ###### Environment(CXX  'g++',
									CPPPATH = '../:./include')

# add to library search path env.Append(LIBPATH = ['/usr/local/lib/'])
# add to libraries link path env.Append(LIBS = ['SDL_image','GL'])

env.Append(CPPFLAGS = ['-isystem ./include'])
env.Append(CXXFLAGS = ['-g', '-Wall', '-Wextra', '-pthread'])

env.SharedLibrary(target ###### 'gtest_main.dll', source  ['../src/gtest-all.cc'])

# after that, we should link with gtest_main
```

Poging tot converteren van deze voorbeeld `Makefile` - supplied bij de gtest sources:

```
# A sample Makefile for building Google Test and using it in user
# tests.  Please tweak it to suit your environment and project.  You
# may want to move it to your project's root directory.
#
# SYNOPSIS:
#
#   make [all]  - makes everything.
#   make TARGET - makes the given target.
#   make clean  - removes all files generated by make.

# Please tweak the following variable definitions as needed by your
# project, except GTEST_HEADERS, which you can use in your own targets
# but shouldn't modify.

# Points to the root of Google Test, relative to where this file is.
# Remember to tweak this if you move this file.
GTEST_DIR = ..

# Where to find user code.
USER_DIR = ../samples

# Flags passed to the preprocessor.
# Set Google Test's header directory as a system directory, such that
# the compiler doesn't generate warnings in Google Test headers.
CPPFLAGS += -isystem $(GTEST_DIR)/include

# Flags passed to the C++ compiler.
CXXFLAGS += -g -Wall -Wextra -pthread

# All tests produced by this Makefile.  Remember to add new tests you
# created to the list.
TESTS = sample1_unittest

# All Google Test headers.  Usually you shouldn't change this
# definition.
GTEST_HEADERS = $(GTEST_DIR)/include/gtest/*.h <br/>
                $(GTEST_DIR)/include/gtest/internal/*.h

# House-keeping build targets.

all : $(TESTS)

clean :
	rm -f $(TESTS) gtest.a gtest_main.a *.o

# Builds gtest.a and gtest_main.a.

# Usually you shouldn't tweak such internal variables, indicated by a
# trailing _.
GTEST_SRCS_ = $(GTEST_DIR)/src/*.cc $(GTEST_DIR)/src/*.h $(GTEST_HEADERS)

# For simplicity and to avoid depending on Google Test's
# implementation details, the dependencies specified below are
# conservative and not optimized.  This is fine as Google Test
# compiles fast and for ordinary users its source rarely changes.
gtest-all.o : $(GTEST_SRCS_)
	$(CXX) $(CPPFLAGS) -I$(GTEST_DIR) $(CXXFLAGS) -c <br/>
            $(GTEST_DIR)/src/gtest-all.cc

gtest_main.o : $(GTEST_SRCS_)
	$(CXX) $(CPPFLAGS) -I$(GTEST_DIR) $(CXXFLAGS) -c <br/>
            $(GTEST_DIR)/src/gtest_main.cc

gtest.a : gtest-all.o
	$(AR) $(ARFLAGS) $@ $^

gtest_main.a : gtest-all.o gtest_main.o
	$(AR) $(ARFLAGS) $@ $^

# Builds a sample test.  A test should link with either gtest.a or
# gtest_main.a, depending on whether it defines its own main()
# function.

sample1.o : $(USER_DIR)/sample1.cc $(USER_DIR)/sample1.h $(GTEST_HEADERS)
	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $(USER_DIR)/sample1.cc

sample1_unittest.o : $(USER_DIR)/sample1_unittest.cc <br/>
                     $(USER_DIR)/sample1.h $(GTEST_HEADERS)
	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $(USER_DIR)/sample1_unittest.cc

sample1_unittest : sample1.o sample1_unittest.o gtest_main.a
	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -lpthread $^ -o $@
```