Localize g++ compile options within code

I'm looking for a simple way to localize certain g++ (g++-4.9 to be specific) compile options to certain lines of code or at least targeted functions. I'm interested generally speaking, but also specifically to the -fast-math, -ffinite-math-only and -fno-signed-zeros options.

I presume that localization at the *.cpp file level is possible with make utility, but I'm hoping there is a way to enable it in the code itself, through #pragma or __attribute__ or something. I want to do this not only to minimize dependencies to external files (i.e. risk of incorrect makefile) but also to hopefully hyperlocalize certain FP behavior to specific equations within a function.

Alternatively, if localization of FP behavior by inline directives is NOT possible, what can I do to at least trigger a compile time error if desired compiler directive is NOT enabled in project build (e.g. makefile is lost or inappropriately modified).

I would presume that such inline optimization might be compiler specific, g++ in this case, but that is a compromise I'm willing to take.