-ldouble

Allows changing the format for long double (by default IEEE32).

Syntax

  -ldouble_size 4 | 8

The arguments are as follows:

4 : IEEE32

8 : IEEE64

Default

4

Defines

  __LONG_DOUBLE_IS_IEEE32__

  __LONG_DOUBLE_IS_IEEE64__

Remarks

For integrity and compliance to ANSI, the following must hold:

  sizeof(double) <= sizeof(long double) <= sizeof(long long double)

Note: Be careful if you change type sizes. Type sizes must be consistent over the whole application. The libraries delivered with the compiler are compiled with the standard type settings. Also, underflows or overflows might occur following type configuration, for example when you assign a value too large to an object which is now smaller.

For more information, refer to the topic Data Types.