[R] broken inline exp in glibc/x86??!

[RenE J.V. Bertin]

I read the following in acinclude.m4:

## R_PROG_CC_FLAG_D__NO_MATH_INLINES
## ---------------------------
## In current glibc, inline version [x86] of exp is broken.
## We fix this by adding '-D__NO_MATH_INLINES' to R_XTRA_CFLAGS rather
## than AC_DEFINE(__NO_MATH_INLINES) as the former also takes care of
## compiling C code for add-on packages.

Is this documented anywhere (where?), e.g. what is broken, which glibc versions are implicated, etc? If not, could anyone please tell me what is the matter -- I to use exp(), and I reckon that gcc will by default use the inline version!

Thanks in advance,
RenE
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