On 6 September 2017 at 08:32, A.J. Bonnema wrote: > Hello, > > I started using _Decimal64. According to the gcc extension this should work > for x86_64. However, the compiler does not recognize the type. Is there any > way to make gcc recognize the type _Decimal64 or should I use the > libdecnumber in stead? > > According to a mail in this mailing list of 3rd may 2013 by Ian Lance Taylor > users should not use libdecnumber but just refer to _Decimal64 / 32 /128 in > stead. > > The manual page I found on the subject is: > https://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html#Decimal-Float. It does > not specify any header I need to include. The header file that the N1154 > document specifies (decfloat.h) is not on my system (should be below > /usr/include). N1154 is an outdated draft, the manual page refers to N1312 which doesn't say anything about <decfloat>. No additional header is needed. That manual page specifically talks about GNU C, not C++, are you using C or C++?