https://bugs.exim.org/show_bug.cgi?id=2240

--- Comment #1 from Jeffrey Walton <noloa...@gmail.com> ---
Regarding this pattern, I've seen this issues on occasion with old tools:

   503  #ifdef SLJIT_IS_FPU_AVAILABLE
   504                  return SLJIT_IS_FPU_AVAILABLE;

I believe the workaround is

   503  #if SLJIT_IS_FPU_AVAILABLE+0
   504                  return SLJIT_IS_FPU_AVAILABLE;

The "+0" tricks the preprocessor into making SLJIT_IS_FPU_AVAILABLE an integral
value that can be tested with a plain #if.

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