On 8/26/2014 5:43 PM, Steven Watanabe wrote:
AMDG
On 08/26/2014 03:23 PM, Edward Diener wrote:
I did not mean to imply that it was building with some other toolset but that it is executing some other executables mentioned in my user-config.jam, for what reason I do not understand. I posted the result of:
b2 --debug-configuration toolset=gcc-4.8.1
on the Boost Build forum after asked to do so but never heard anything further. The output shows that clang is being executed for some reason or other.
I see. That's the expected behavior. It's running clang in order to get the version number from the compiler. using clang ... ; is a function call which configures the clang toolset and it does so immediately.
I think it is wrong to do so immediately. If I am using the clang toolset I would understand it, but if I am not using the clang toolset I do not understand what purpose configuring the clang toolset could serve. I do understand that as far as Boost Build is concerned user-config.jam is probably just another jamfile, which follows the rules of how jam files are processed, and that this may make programming Boost Build easier. But I think an exception should be made for user-config.jam ( and probably site-config.jam also ) in that the end-user may place jam statements in it which are totally irrelevant for the particular jam file(s) being invoked and the toolset used, but which will of course be relevant in another situation. Therefore completely configuring toolsets which appear in user-config.jam, before the toolsets are specified anywhere in the jam file(s) being invoked, every time b2 is run against jam file(s) and a toolset is specified, does not seem the right way of doing things to me. Besides the local problem I encountered, described in my OP, which admittedly is very probably a rare situation, Boost Build is doing all sorts of extra processing it probably doesn't need to do the majority of the time when b2 is run, when it auomatically configures every toolset in user-config.jam which has the 'using toolset ... ' statement. I will file this as a suggestion on Trac and I hope it will be considered in Boost Build.