Question

我尝试使用scons函数来检测特定的头文件是否可用。给定文件main.cpp并带有#include "fns.h"。我创造了这个：

env = Environment(CXXFLAGS='-I.')
conf = Configure(env)
if not conf.CheckCXXHeader('fns.h'):
    print 'please get fns.h'
    Exit(1)

env.Program('main.cpp')

我第一次运行它时，实际上会检查标题，但之后它总是使用缓存的结果

$ scons
scons: Reading SConscript files ...
Checking for C++ header file fns.h... no
please get fns.h

$ touch fns.h
$ scons
scons: Reading SConscript files ...
Checking for C++ header file fns.h... yes
scons: done reading SConscript files.
scons: Building targets ...
g++ -o main.o -c -I. main.cpp
g++ -o main main.o
scons: done building targets.

$ rm fns.h # delete it
$ scons # should check again here, but doesn't
scons: Reading SConscript files ...
Checking for C++ header file fns.h... (cached) yes
scons: done reading SConscript files.
scons: Building targets ...
g++ -o main.o -c -I. main.cpp
main.cpp:1:17: fatal error: fns.h: No such file or directory
 #include "fns.h"

Answer 1

请查看SCons手册（man scons），您正在寻找的命令行选项是＆＃34; - config = force＆＃34;。您还可以通过在SConscript文件中设置config选项使其成为构建的默认行为：

SetOption('config', 'force')

scons检查可用文件而不缓存结果

1 个答案: