如何在Scons中使用交叉编译器？ [英] How can I use a cross compiler with Scons?

问题描述

遵循建议在Scons常见问题解答上并通过旧的邮件列表线程，我建立了一个非常简单的 SConstruct 和 SConscript 以为会构建一个示例应用程序，但出现以下错误：

Following the advice on the Scons FAQ and from an old mailing list thread, I've built up a really simple SConstruct and SConscript that I thought would build an example app, but errors out with:

scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
nios2-linux-gnu-g++ -o src/bin/example/example.o -c src/bin/example/example.cpp
sh: nios2-linux-gnu-g++: command not found
scons: *** [src/bin/example/example.o] Error 127
scons: building terminated because of errors.

U。我的 SConstruct 文件：

import os

env_options = {
    "CC"    : "nios2-linux-gnu-gcc",
    "CXX"   : "nios2-linux-gnu-g++",
    "LD"    : "nios2-linux-gnu-g++",
    "AR"    : "nios2-linux-gnu-ar",
    "STRIP" : "nios2-linux-gnu-strip",
    "PATH"  : os.environ['PATH']
}

env = Environment(**env_options)
Export('env')

env.SConscript("src/bin/example/SConscript")

以及它调用的SConscript：

and the SConscript it calls:

Import('env')

env.Program("example", ["example.cpp"])

我认为这是 env.Dump（ ）（如果缺少某些信息，请告诉我）：

Here's what I think are the relevant parts of env.Dump() (If something's missing let me know):

{ 'AR': 'nios2-linux-gnu-ar',
  'CC': 'nios2-linux-gnu-gcc',
  'CCCOM': '$CC -o $TARGET -c $CFLAGS $CCFLAGS $_CCCOMCOM $SOURCES',
  'CCFLAGS': [],
  'CCVERSION': '4.8.2',
  'CFILESUFFIX': '.c',
  'CFLAGS': [],
  'CPPDEFPREFIX': '-D',
  'CPPDEFSUFFIX': '',
  'CPPSUFFIXES': [ '.c',
                   '.C',
                   '.cxx',
                   '.cpp',
                   '.c++',
                   '.cc',
                   '.h',
                   '.H',
                   '.hxx',
                   '.hpp',
                   '.hh',
                   '.F',
                   '.fpp',
                   '.FPP',
                   '.m',
                   '.mm',
                   '.S',
                   '.spp',
                   '.SPP',
                   '.sx'],
  'CXX': 'nios2-linux-gnu-g++',
  'CXXCOM': '$CXX -o $TARGET -c $CXXFLAGS $CCFLAGS $_CCCOMCOM $SOURCES',
  'CXXFILESUFFIX': '.cc',
  'CXXFLAGS': [],
  'CXXVERSION': '4.8.2',
  'HOST_ARCH': None,
  'HOST_OS': None,
  'PATH': '/home/chockey/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/chockey/bin/altera/13.1/quartus/bin:/home/chockey/bin/altera/13.1/quartus/sopc_builder/bin:/home/chockey/bin/altera/13.1/nios2eds/bin:/home/chockey/bin/altera/13.1/nios2eds/sdk2/bin:/home/chockey/bin/altera/13.1/nios2eds/bin/gnu/H-i686-pc-linux-gnu/bin',
  'TOOLS': [ 'default',
             'gnulink',
             'gcc',
             'g++',
             'gfortran',
             'gas',
             'ar',
             'filesystem',
             'm4',
             'lex',
             'yacc',
             'rpcgen',
             'jar',
             'javac',
             'javah',
             'rmic',
             'dvipdf',
             'gs',
             'tar',
             'zip'],

最肯定存在于第一个路径条目中的工具（作为符号链接，如果重要的话， t我尝试将完整路径添加到工具链中，这似乎没有任何改变）：

The tools most certainly exist at the first path entry (as symlinks, if that matters, but I tried adding the full path to the toolchain, that didn't seem to change anything):

/home/chockey/bin/nios2-linux-gnu-addr2line@   /home/chockey/bin/nios2-linux-gnu-gcov@
/home/chockey/bin/nios2-linux-gnu-ar@          /home/chockey/bin/nios2-linux-gnu-gdb@
/home/chockey/bin/nios2-linux-gnu-as@          /home/chockey/bin/nios2-linux-gnu-gprof@
/home/chockey/bin/nios2-linux-gnu-c++@         /home/chockey/bin/nios2-linux-gnu-ld@
/home/chockey/bin/nios2-linux-gnu-c++filt@     /home/chockey/bin/nios2-linux-gnu-nm@
/home/chockey/bin/nios2-linux-gnu-cpp@         /home/chockey/bin/nios2-linux-gnu-objcopy@
/home/chockey/bin/nios2-linux-gnu-elfedit@     /home/chockey/bin/nios2-linux-gnu-objdump@
/home/chockey/bin/nios2-linux-gnu-g++@         /home/chockey/bin/nios2-linux-gnu-ranlib@
/home/chockey/bin/nios2-linux-gnu-gcc@         /home/chockey/bin/nios2-linux-gnu-readelf@
/home/chockey/bin/nios2-linux-gnu-gcc-4.7.3@   /home/chockey/bin/nios2-linux-gnu-size@
/home/chockey/bin/nios2-linux-gnu-gcc-ar@      /home/chockey/bin/nios2-linux-gnu-sprite@
/home/chockey/bin/nios2-linux-gnu-gcc-nm@      /home/chockey/bin/nios2-linux-gnu-strings@
/home/chockey/bin/nios2-linux-gnu-gcc-ranlib@  /home/chockey/bin/nios2-linux-gnu-strip@

如何获取图标以找到我的工具链？

How do I get scons to find my toolchain?

推荐答案

您快到了。您要将 PATH 添加到SCons构造环境中，而不是添加到构造环境的 ENV 项中：

You're almost there. You're adding your PATH to the SCons construction environment instead of to the ENV key of the construction environment:

import os

env_options = {
    "CC"    : "nios2-linux-gnu-gcc",
    "CXX"   : "nios2-linux-gnu-g++",
    "LD"    : "nios2-linux-gnu-g++",
    "AR"    : "nios2-linux-gnu-ar",
    "STRIP" : "nios2-linux-gnu-strip",
}

env = Environment(**env_options)
env.Append(ENV = {'PATH' : os.environ['PATH']})
Export('env')

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