The PowerPC port(s) of GCC have included auto-detection of host cpu
type through the "native" option, but it had not been documented.
This patch adds the documentation to the GCC Manual.
* doc/invoke.texi (PowerPC Options): Document 'native' cpu type.
Thanks, David
Index: invoke.texi
===================================================================
--- invoke.texi (revision 257055)
+++ invoke.texi (working copy)
@@ -22333,7 +22333,7 @@
@samp{titan}, @samp{power3}, @samp{power4}, @samp{power5}, @samp{power5+},
@samp{power6}, @samp{power6x}, @samp{power7}, @samp{power8},
@samp{power9}, @samp{powerpc}, @samp{powerpc64}, @samp{powerpc64le},
-and @samp{rs64}.
+@samp{rs64}, and @samp{native}.
@option{-mcpu=powerpc}, @option{-mcpu=powerpc64}, and
@option{-mcpu=powerpc64le} specify pure 32-bit PowerPC (either
@@ -22341,6 +22341,12 @@
architecture machine types, with an appropriate, generic processor
model assumed for scheduling purposes.
+Specifying @samp{native} as cpu type detects and selects the
+architecture option that corresponds to the host processor of the
+system performing the compilation.
+@option{-march=native} has no effect if GCC does not recognize the
+processor.
+
The other options specify a specific processor. Code generated under
those options runs best on that processor, and may not run at all on
others.
