+O[no]rotating_fpregs
+O[no]rotating_fpregs
The +O[no]rotating_fpregs option specifies whether the compiler is allowed [not allowed] to make use of the rotating subset of the
The default is +Orotating_fpregs.
+O[no]sumreduction
+O[no]sumreduction
This option enables [disables] sum reduction optimization. It allows the compiler to compute partial sums to allow faster computations. It is not technically legal to do this in C or C++ because of
When sum reduction optimization is enabled, the compiler may evaluate intermediate partial sums of float or double precision terms using (wider) extended precision, which reduces variation in the result caused by different optimization strategies and generally produces a more accurate result.
Header File Options
Following are the
cc
The
+hdr_create
aCC progname
This option extracts the header from a program file and saves it as a precompiled header file.
Example:
aCC ApplicTemplate.C
+hdr_use
aCC progname +hdr_use headerfile
This option adds a precompiled header file to a program when the program is compiled.
Example:
aCC Applic.C +hdr_use ApplicHeader
directory is the
During the compile phase, this option adds directory to the directories to be searched for #include files during preprocessing. During the link phase, this option adds directory to the directories to be searched for #include files by the
For #include files that are enclosed in double quotes (" ") within a source file and do not begin with a /, the preprocessor searches in the following order:
Header File Options 45