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[bug #57071] Fix math.h and function names that block 64-bit double


From: Georg-Johann Lay
Subject: [bug #57071] Fix math.h and function names that block 64-bit double
Date: Fri, 25 Oct 2019 11:52:55 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0

Follow-up Comment #8, bug #57071 (project avr-libc):

FYI, there is the according GCC issue + patch

http://gcc.gnu.org/PR92055

>From the doc of
https://gcc.gnu.org/bugzilla/attachment.cgi?id=47114&action=diff


+@item -mdouble=@var{bits}
+@opindex mdouble
+Set the size (in bits) of the @code{double} type.  Valid values for
+@var{bits} are 32 and 64. This option is only available if the compiler
+is configured with @code{--with-double=32} or with @code{--with-double=64},
+and the argument of @code{--with-double=} specifies the default layout of
+@code{double}.
+
+@item -mlong-double=@var{bits}
+@opindex mlong-double
+Set the size (in bits) of the @code{long double} type.  Valid values for
+@var{bits} are 32 and 64. This option is only available if the compiler
+is configured with @code{--with-long-double=32} or with
+@code{--with-long-double=64}, and the argument of @code{--with-long-double=}
+specifies the default layout of @code{long double}.




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