Martin Sarrazac wrote:
Hi, compiler: mingw gcc 3.4.4 I would like to compile boost.signals without exception handling, I read somewhere about the <exception-handling> feature so I tried:
bjam --builddir=c:\temp -sTOOLS=mingw "-sBUILD=debug <exception-handling>off <runtime-link>dynamic <threading>single" --libdir=C:\boost\lib\noe --with-signals -d2 install
without success, it compiles fine but not without exception handling. specifically the -fno-exception command line option should be passed to gcc and it's not.
I had a look at tools/build/v1/gcc-tools.jam and I found this line for rtti support for instance:
flags gcc C++FLAGS <rtti>off : -fno-rtti ;
However there is nothing equivalent for exceptions...
Good job on the investigation :-) Very few users bother to go this far. Yes even though "<exception-handling>" is defined there is no handling for it in the GCC toolset. It's easy enough to add that you could easily do it, as it's basically the same as the <rtti> flag you found. But it is also possible to specify any additional compile flags with the -sBUILD setting. One just needs to use the <cxxflags> feature.
On a side note I don't know how to give a new tag to the 'no exception' version of the library, so I compiled it in an other directory (--libdir=C:\boost\lib\noe). However I would much prefer to give it a specific name.
Now that's a tough one. There's no non-intrusive way to change the tags. You would need to modify the Boost.Build code some. The place to do it at would be in the "tools/build/v1/boost-base.jam" file. In there there's a "rule common-variant-tag ..." which you would need to change to add another letter to the tags when a build with <exception-handling>off shows up.
Is there somewhere information about all the -sBUILD flags can be found? Can't seem to locate it.
The only complete docs on that are on the source itself: http://www.boost.org/tools/build/v1/features.jam - Don't worry if you got far enough to somewhat parse the gcc-tools.jam file that one should be a cake walk. -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - Grafik/jabber.org