AMDG On 11/07/2018 09:09 AM, James E. King III via Boost wrote:

I'm looking for an example for how I could check to see if "-fPIC" is supported for the compiler as part of project requirements.

In some recent PRs that include building a static library which then gets included in a shared library, code needs to be built with "-fPIC" on supported platforms/toolsets. There is some code in gcc.jam to do this if the overall link mode is shared (note: this code is not in clang.jam!), but in this case the overall link mode is static, and a Jamfile wraps the result in a shared library, so the directives in gcc.jam are not applied.

So at the top level Jamfile, I want to add a project requirement that basically says, "if the compiler supports <cxxflags>-fPIC then use it".

import flags ; project : requirements [ check-has-flag <cxxflags>-fPIC : <cxxflags>-fPIC ] ; Note 1: The documentation for this is only in `b2 --help flags.check-has-flag`. It isn't integrated into the html docs yet. Note 2: This is pretty new, so if you run into any problems, please let me know. Note 3: It might be more reliable to separate the object files out and set <link>shared on them: obj x.o : x.cpp : <link>shared ; ... lib l : x.o y.o ... ; (This will only work if the library is one that is specifically built for the test, not if it's a generic Boost library.) In Christ, Steven Watanabe