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Well, for Os 3.1.4, we had kinna the reverse problem, namely to let SAS/C accept IEEE single precision constants. The solution there, albeit hacky, was to have a (self-written) preprocessor (not the standard C preprocessor) which took these constants, and converted them to references (i.e. __3_14159), and then later in the build stage, C was compiled to assembler (not object code), and a second script then converted those constants by suitable immediate hex values.
It was really a sort of abuse of the SAS/C compiler chain, and an external "hack" that abused that chain.
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