Hannes Magnusson wrote:
On Thu, Nov 6, 2008 at 21:42, David Soria Parra <[EMAIL PROTECTED]> wrote:
dsp Thu Nov 6 20:42:12 2008 UTC
Modified files: (Branch: PHP_5_3)
/php-src acinclude.m4 configure.in NEWS
Log:
MFH: Detect Sun C compiler and set default flags if it is used
[...]
+- Added default flags for suncc compiler. (David Soria Parra)
Thats great.. what are those default flags and "why should I care"?
Hi Hannes,
so the complete list is at
http://docs.sun.com/app/docs/doc/819-5265/bjapp?a=view but let me get
through the most important parts of the list:
xtarget=native
Causes to generate processor specific code.
xalias_level=basic
does optimization based on basic assumptions about the c types e.g.
float* will not point to int*.
fsimple=2
will simplify floating point arithmetic
xipo=1
will do an analysis of all object files and try to optimize across all
object files.
xlibmopt
optimize math routines, according to the documentation this might result
in slight differences to the std math lib. But I asked some sun
engineers and it was considered safe.
So actually I picked options that usually are set by the -fast option,
but removed the onces that might cause problems. That's why the list is
that long and that's even why I don't use -xO5 but -xO4 to not run in
errors (this was recommand by some webstack guy).
The only sad thing is that you still need to set the compiler using the
CC env variable as by default we are looking for gcc and ignoring other
compilers even though they are the default cc compiler on those
machines. I acutally think that this is not desirable.
David
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