On 05/06/13 22:05, Michel Dupront wrote:
hello,
I installed the getfem++ dev library on my ubuntu 12.04 platform
using synaptic.
I supposed that the c++ code has been compiled with optimization
options.
How can I know what options have been used ?
Thanks in advance.
Here is how I think it can be done:
First, go to this Ubuntu page for getfem++:
https://launchpad.net/ubuntu/+source/getfem++/
Then, near the bottom you'll find a link to the 12.04 version (called
Lucid). Click on the little triangle next to the link "4.0.0-3" within
that section. Then click on the link called "amd64" that has just
emerged. That sends you to a page with a link called "buildlog".
Within that file I search for e.g. for "./configure" to find the
detailed configure command that was run on the Ubuntu build server. It was:
./configure --build x86_64-linux-gnu --prefix=/usr --enable-boost
--enable-shared --with-pic --enable-python --disable-matlab
--disable-superlu CFLAGS="-g -O2"
So you can see that these options were used for the configure script,
and the last item tells us that "-g -O2" were used as options for GCC.
However, there is something slightly strange there, because if you
inspect the g++ commands in detail further down in the buildlog, it
shows that -O3 is used as well. E.g.:
g++ -DHAVE_CONFIG_H -I. -I.. -I../src -I../src -I.. -DGMM_USES_BLAS -g
-O2 -O3 -Wall -W -fmessage-length=0 -ftemplate-depth-40 -pedantic
-Wshadow -Wpointer-arith -Wcast-qual -Wwrite-strings -Wconversion
-Wredundant-decls -Wno-long-long -MT bgeot_poly.lo -MD -MP -MF
.deps/bgeot_poly.Tpo -c bgeot_poly.cc -fPIC -DPIC -o .libs/bgeot_poly.o
All g++ invocations seem to use "-g -O2 -O3".
Hope this helps.
Best regards
Torquil Sørensen
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