Mika Heiskanen wrote:

Hello,

Jam documentation mentions that "Jam picks up variable settings from your environment by default". However, I could not find any documentation on what environment variables affect what options. In particular, I am looking for a way to pass on to Jam the --layout and --build-type options via environment variables. Currently I am building a boost rpm for local distribution by using the following command sequence in the rpm .spec file:

%build ./configure --prefix=%{_prefix} --libdir=%{_libdir} cat Makefile | sed -e 's/BJAM_CONFIG=/BJAM_CONFIG=--layout=system --build-type=complete/' > Makefile.new mv Makefile.new Makefile make all

If I understand correctly, I should be able to define the compile options via environment variables instead of resorting to a hack like above.

I'd appreciate any pointers to more detailed documentation on how to accomplish the above with environment variables alone.

It's not possible. Whereas all environment variables are picked from environemnt in are present in global jam module and can be accessed as documented in the manual, no environment variable affects layout or build type. The only (good) think that configure call above does is creating user-config.jam file with some guessed values. If you look at Makefile, you can find --user-config option is used to point Boost.Build at that user-config.jam. So, instead of using make, you can invoke bjam as: bjam --user-config=<user-config.jam> <other options> and you'll be in position to pass whatever options you want. - Volodya