Re: [boost] [tools] gcc compiler version detection

From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2007-01-08 12:52:49

Glenn Schrader wrote:
> The attached patch file fixes a problem that I have been having
> attempting to build a recent version from cvs with gcc 4.1.1

Sorry for not trying to fix this earlier...

> Jam appears to build a single string out of this output, newlines
> and all. The real problem is in tools/build/v2/tools/gcc.jam.
> The line that parses the gcc output is:
> 
> local command-info = [ MATCH "^[^ ]+[ ]+[^ ]+[ ]+([^ ]+)[^(]*[(]?([^)]*)"
> 
> The regex snippet that should match the version number is '([^ ]+)'.
> The problem is that since '\n' != ' '

As it should be.

> The attached patch modifies tools/jam/src/regexp.c to add support for
> using newlines in character ranges and changes the above line in
> gcc.jam to:
> 
> local command-info = [ MATCH "^[^ ]+[ ]+[^ ]+[ ]+([^ 
> \\n]+)[^(]*[(]?([^)]*)"

This would not be the way I would fix it. It will have the likely effect 
of breaking a bunch of other stuff that uses the regex function in bjam. 
The easier fix is to change the regex itself to include the newline as:

         local command-info = [ MATCH "^[^ ]+[ ]+[^ ]+[ ]+([^
  ]+)[^(]*[(]?([^)]*)"

Yes that's a literal newline at the end of the first line. If you could 
test with that change the would be wonderful :-)

> Has anybody else seen this?

Nope, yours is the first GCC that I've seen that doesn't put something 
after the version number.

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