Re: Package dependencies in cross gcc

[Phil Endecott <phil_qtefy_endecott@chezphil.org>]

Nikita V. Youshchenko wrote:
> running 'arm-linux-g++ -D_REENTRANT -c test.cpp' completes without any 
> errors.

Ah, OK.  It seems that I don't need to define -D_REENTRANT on my x86 PC; 
 I get:

g++ test.cc ->  #error "...threading support not enabled...
g++ -pthread test.cc -> OK
g++ -D_REENTRANT test.cc -> OK

But with the cross-compiler, I get

armeb-linux-g++ test.cc ->  #error "...threading support not enabled...
armeb-linux-g++ -pthread test.cc -> #error "...threading support not 
enabled...
armeb-linux-g++ -D_REENTRANT test.cc -> OK

On the PC, passing -pthread defines _REENTRANT, but it doesn't for the 
cross-compiler.  Why?  What is the recommended platform-independent way 
to ask for thread-safe code?  I just obeyed Boost's error message, which 
says "Please set the correct command line options for threading: 
-pthread (Linux)"; should it instead suggest -D_REENTRANT?  I suppose 
this is getting OT for this list.

Thanks for your help.

--Phil.