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I found I needed to use identifier_global_value() to grab a handle on signgam. This function only appears in the C-family frontends. So I ended up deciding to use a langhook. The langhook defaults to returning NULL_TREE which stops the transformation in most languages. From the C-family, c_get_signgam() will return a usable tree for signgam if it's been declared extern int at that point in the user's code. (Simply including math.h will declare it in conforming C99 libc implementations.) I didn't bother to declare signgam on-the-fly if it wasn't found since I wasn't sure that was safe.
langhooks are bad will not work in LTO. A better way is to add a function to libgcc for setting of signgam and a configure test for signgam in libgcc to check if it exists and the function would just simply not do anything if it does not exist.
Thanks, Andrew Pinski
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