Re: [jamboost] Jam Tutorial example doesn't work with Boost's Jam

From: Rene Rivera (grafik666_at_[hidden])
Date: 2002-12-22 01:06:12

[2002-12-20] David Abrahams wrote:

>"Felix E. Klee <felix.klee_at_[hidden]>" <felix.klee_at_[hidden]> writes:
>
>> Hi,
>>
>> I'm a jam newbie and, therefore, started reading the "Getting Started
>> with Jam/MR" tutorial available from Perforce's web site. However, I
>> found that some examples work with Perforce's original jam but not
>> with the jam as part of Boost 1.29.0. The source code of a file called
>> test reads
>>
>> rule MyRule
>> {
>> TouchFile $(1) ;
>> }
>>
>> actions TouchFile
>> {
>> touch $(1)
>> }
>>
>> MyRule test.output1 ;
>> MyRule test.output2 ;
>> MyRule test.output3 ;
>>
>> When I run "jam -ftest test.output2" with Boost's jam (or bjam) I get
>> the error messages
>> don't know how to make all
>> ...found 1 target...
>> ...can't find 1 target...
>> whereas I get the expected messages
>> ...found 1 target(s)...
>> ...updating 1 target(s)...
>> TouchFile test.output2 
>> ...updated 1 target(s)...
>> when using Perforce's jam. Am I doing something wrong or is this a
>> bug/feature in Boost's Jam?
>
>Yes ;-)
>
>The problem is this:
>
>Perforce Jam automatically updates everything that doesn't look like
>an option on the command line. We wanted to be able to control what
>gets updated, so we turned that off in core jam and wrote this little
>thing in Jambase which does it programmatically:
>
> for local e in $(ARGV[2-]) 
> {
> if ! [ MATCH "^(-).*" : $(e) ] 
> {
> # This is not an option, so it is a target name.
> UPDATE $(e) ;
> }
> }
>
>Unfortunately, that broke compatibility with Perforce Jam for cases
>where the users adds -f to the command-line. I don't think that was
>intentional, so I guess I'd call it a bug. You can add the code above
>to any file foo you use with -ffoo to get it to work like Perforce Jam
>while we figure out what to do about it.

I think I wrote that bit of code already at the bottom of build.jam. As in I
copied the code and then noticed the bug in it, but hadn't changed Jambase
version also.

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