[csw-maintainers] SUNWspro cc Libtool and "fast install" information.

[Dagobert Michelsen]

Hi Mike,

do you mind putting this in the GAR wiki about compilation flags?


Best regards

   -- Dago

Am 20.02.2009 um 00:37 schrieb Mike Watters:

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> - --enable-fast-install is enabled by default on most packages.   
> This is
> not necessarily a problem.  when using Sun's compiler.  the system  
> will
> change the libraries shared objects link against to a more "optimized"
> library.  There are only a handful of cases this is not desirable.
> here is the information I have come across that may be useful to the
> other maintainers.
>
>
> This is the macro libtool uses:
>
> - -- Macro: AC_DISABLE_FAST_INSTALL
>     Change the default behaviour for `AC_PROG_LIBTOOL' to disable
>     optimization for fast installation.  The user may still override
>   this default, depending on platform support, by specifying
>     `--enable-fast-install'.
>
> and
> Below is an excerpt from  the man page for SUNWspro "cc"
>
> - -fast
>          This option is a macro that you can effectively use as
>          a starting point for tuning an executable for maximum
>          run-time performance. The expansion of -fast can change
>          from one release of the compiler to the next and
>          includes options that are target platform specific. Use
>          the -# or the -xdryrun options to examine the expansion
>          of -fast, and incorporate the appropriate options of
>          -fast into the ongoing process of tuning the execut-
>          able.
>
>          The expansion of -fast now includes the new -xlibmopt
>          option. This option enables the compiler to use a
>          library of optimized math routines. For more informa-
>          tion, see the description of -xlibmopt in this man
>          page.
>
>          The -fast option impacts the value of errno. See the
>          NOTES section at the end of this man page for more
>          information.
>
>          Modules that are compiled with -fast must also be
>          linked with -fast. For a complete list of compiler
>          options that must be specified at both compile time and
>          at link time, see the C User's Guide.
>
>          The -fast option is unsuitable for programs that are
>          intended to run on a different target than the compila-
>          tion machine. In such cases, follow -fast with the
>          appropriate -xtarget option. For example:
>
>                % cc -fast -xtarget=ultra
>
>          For C modules depending on exception handling specified
>          by SUID, follow -fast by -xnolibmil
>
>                % cc -fast -xnolibmil
>
>          The -fast option acts like a macro expansion on the
>          command line. Therefore, you can override any of the
>          expanded options by following -fast with the desired
>          option.
>
>          If you combine -fast with other options, the last
>          specification applies.
>
>          These options are turned on for -fast:
>
>          -fns (SPARC, x86)
>          -fsimple=2 (SPARC, x86)
>          -fsingle (SPARC, x86)
>          -nofstore (x86)
>          -xalias_level=basic (SPARC, x86)
>          -xbuiltin=%all (SPARC, x86)
>          -xdepend (SPARC, x86)
>          -xlibmil (SPARC, x86)
>          -xlibmopt (SPARC)
>          -xmemalign=8s (SPARC)
>          -xO5 (SPARC, x86)
>          -xprefetch=auto,explicit (SPARC)
>          -xregs=frameptr (x86)
>          -xtarget=native (SPARC, x86)
>
>          Note that this selection of component option flags is
>          subject to change with each release of the compiler.
>          For details on the options set by -fast, see the C
>          User's Guide.
>
>          To determine the expansion of -fast on a running sys-
>          tem, execute the command cc -fast -xdryrun |& grep ###
>
>          Note: Some optimizations make certain assumptions about
>          program behavior. If the program does not conform to
>          these assumptions, the application may crash or produce
>          incorrect results. Please refer to the description of
>          the individual options to determine if your program is
>          suitable for compilation with -fast.
>
>          Do not use this option for programs that depend on IEEE
>          standard exception handling; you can get different
>          numerical results, premature program termination, or
>          unexpected SIGFPE signals.
>
>
>
> - --
>
> Thanks,
> Mike
>
> "Any intelligent fool can make things bigger, more complex,
> and more violent.  It takes a touch of genius -- and a lot of  
> courage --
> to move in the opposite direction."
>
> * Albert Einstein 1879 - 1955
>    US German-born Theoretical Physicist
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