[ast-developers] [-Wstrict-aliasing] warnings in ast-open.2013-07-27's vmalloc code ...

Glenn Fowler

2013-08-02 15:27:47 UTC

I also get those in one of my builds -- will check

hmm diff between ast-ksh and ast-open is mamake vs nmake build
try this from the ast-open PACKAGEROOT to see if a hunch I have is correct

bin/package use
cd libast
nmake -n --nativepp=-1 vmbest.o > xx 2>&1

then edit xx to make it executable and run it
(doing it this way will only make vmbest.o out of date the next time you run nmake)

Post by Roland Mainz
Hi!
----
I'm getting the following strict aliasing warnings when building
ast-open.2013-07-27 (and only on ast-open... ast-ksh doesn't seem to
be affected) on SuSE 12.3/AMD64/64bit: (gcc version is "gcc (SUSE
Linux) 4.7.2 20130108 [gcc-4_7-branch revision 195012]")
-- snip --
+ cc '-DSHOPT_CMDLIB_BLTIN=0' '-DSH_CMDLIB_DIR="/usr/ast/bin"'
'-DSHOPT_CMDLIB_HDR="$BUILDROOT/tmp_gnulinux_builtin_header.h"'
-DSHOPT_SYSRC '-D_map_libc=1' -g -ggdb -fno-builtin
-fstrict-aliasing -Wstrict-aliasing -Wsequence-point -Wno-parentheses
-Wno-unused -Wno-trigraphs -Wclobbered -Waddress -D_BLD_ast -I.
-I$BUILDROOT/src/lib/libast/vmalloc -I$BUILDR
OOT/src/lib/libast/include -I$BUILDROOT/src/lib/libast/std -I- -I. -I.
-I$BUILDROOT/src/lib/libast/include -I$BUILDROOT/src/lib/libast/comp
-I$BUILDROOT/src/lib/libast/std -I$BUIL
DROOT/src/lib/libast/vmalloc -D_BLD_DEBUG -D_PACKAGE_ast -c
$BUILDROOT/src/lib/libast/vmalloc/vmbest.c
cc1: note: obsolete option -I- used, please use -iquote instead
dereferencing type-punned pointer will break strict-aliasing rules
[-Wstrict-aliasing]
+ cc '-DSHOPT_CMDLIB_BLTIN=0' '-DSH_CMDLIB_DIR="/usr/ast/bin"'
'-DSHOPT_CMDLIB_HDR="$BUILDROOT/tmp_gnulinux_builtin_header.h"'
-DSHOPT_SYSRC '-D_map_libc=1' -g -ggdb -fno-builtin -fstrict-aliasing
-Wstrict-aliasing -Wsequence-point -Wno-parentheses -Wno-unused
-Wno-trigraphs -Wclobbered -Waddress -D_BLD_ast -I.
-I$BUILDROOT/src/lib/libast/vmalloc
-I$BUILDROOT/src/lib/libast/include -I$BUILDROOT/src/lib/libast/std
-I- -I. -I. -I$BUILDROOT/src/lib/libast/include
-I$BUILDROOT/src/lib/libast/comp -I$BUILDROOT/src/lib/libast/std
-I$BUILDROOT/src/lib/libast/vmalloc -D_BLD_DEBUG -D_PACKAGE_ast -c
$BUILDROOT/src/lib/libast/vmalloc/vmclear.c
cc1: note: obsolete option -I- used, please use -iquote instead
dereferencing type-punned pointer will break strict-aliasing rules
[-Wstrict-aliasing]
--snip --
Erm... any idea why this happens for ast-open only ?
----
Bye,
Roland
--
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