[vbox-dev] gcc version 4.8.0 found

Frank Mehnert frank.mehnert at oracle.com
Thu Feb 21 15:48:57 GMT 2013


On Tuesday 29 January 2013 08:39:54 Frank Mehnert wrote:
> On Monday 28 January 2013 21:27:54 Sérgio Basto wrote:
> > Next Fedora (19) will have gcc 4.8 and gcc 4.8 hit rawhide,
> > have you already begin devel support for gcc 4.8 ?
> > if yes where I found the patches ?
> No support yet. gcc 4.8.0 is not released yet and even not yet branched.
> We cannot waste resources fixing bugs against beta development tools. So
> patience please. The adaptions will be visible in the public subversion
> repository, as usual.

Btw, I just tried to compile VirtualBox 4.2 with gcc-4.8 and it works
after I upgraded to a recent gcc build. I'm currently using

gcc version 4.8.0 20130218 (experimental) [trunk revision 196115] (Debian 4.8-20130217-1)

Older gcc-4.8 snapshots had a bug which made it stop compiling some VBox
inline assembler functions.

Using the following patch prevents a bunch of warnings:

--- Config.kmk  (revision 83894)
+++ Config.kmk  (working copy)
@@ -1479,7 +1479,7 @@
 # Compiler optimization flags.
-VBOX_GCC_WARN     ?= -Wall $(VBOX_GCC_Wextra) $(VBOX_GCC_Wno-missing-field-initializers) -Wno-unused -Wno-
trigraphs $(VBOX_GCC_fdiagnostics-show-option)
+VBOX_GCC_WARN     ?= -Wall $(VBOX_GCC_Wextra) $(VBOX_GCC_Wno-missing-field-initializers) -Wno-unused -Wno-
trigraphs $(VBOX_GCC_fdiagnostics-show-option) -Wno-unused-parameter -Wno-unused-but-set-parameter -Wno-unused-but-
 VBOX_GCC_WARN_PEDANTIC = -Wshadow $(VBOX_GCC_WARN) -Wno-long-long
  VBOX_GCC_WARN_PEDANTIC += -Wunused-variable -Wunused-function -Wunused-label -Wunused-parameter

We might fix some of these unused parameter warnings but certainly not in
the next time.

Kind regards,

Dr.-Ing. Frank Mehnert | Software Development Director, VirtualBox
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