Christian Knoke wrote on Sep 10, 13:05 (+0200):
>
> How do I set gcc options correctly?
>
> make -j 4 clean
> ./autogen.sh
> export CFLAGS="-O0"
> export CXXFLAGS="${CFLAGS}"
> ./configure
> make -j 4
>
> is what I currently do.
I am testing with S2_5 R26260
$ env | grep FLAGS
./autogen.sh
make -j 4
client$ ls -l freeciv-gtk2
-rwxr-xr-x 1 chris chris 8775873 10. Sep 13:33 freeciv-gtk2
export CFLAGS="-O2"
export CXXFLAGS="${CFLAGS}"
$ env | grep FLAGS
CXXFLAGS=-O2
CFLAGS=-O2
./autogen.sh
make -j 4
$ ls -l client/freeciv-gtk2
-rwxr-xr-x 1 chris chris 2599529 10. Sep 13:40 client/freeciv-gtk2
export CFLAGS=""
export CXXFLAGS="${CFLAGS}"
$ env | grep FLAGS
CXXFLAGS=
CFLAGS=
./autogen.sh
make -j 4
ls -l client/freeciv-gtk2-r26260-emptyflags
-rwxr-xr-x 1 chris chris 2923988 10. Sep 13:28
client/freeciv-gtk2-r26260-emptyflags
If I set no flags at all, the binary size is 8.7 mb. If I set gcc flags to
-O2 what I think is waht default is in freeciv, size goes down to 2.9 mb
If I set empty flags (what means I think, no optimization), the size is also
down to 2.9 mb
So I wonder why -O2 is so different from default. What is wrong?
Christian
--
Christian Knoke * * * http://cknoke.de
* * * * * * * * * Ceterum censeo Microsoft esse dividendum.
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