Hi Pritam,
You can use -frecord-gcc-switches.
This switch causes the command line that was used to invoke the compiler to be recorded into the object file that is being created.
$ gcc -O2 -frecord-gcc-switches -g -o test test.c
$ readelf -p .GCC.command.line test
String dump of section '.GCC.command.line':
[ 0] test.c
[ 7] -D_FORTIFY_SOURCE=2
[ 1b] -mtune=generic
[ 2a] -march=i686
[ 36] -g
[ 39] -O2
[ 3d] -frecord-gcc-switches
[ 53] -fstack-protector
[ 0] test.c
[ 7] -D_FORTIFY_SOURCE=2
[ 1b] -mtune=generic
[ 2a] -march=i686
[ 36] -g
[ 39] -O2
[ 3d] -frecord-gcc-switches
[ 53] -fstack-protector
$
$ readelf --debug-dump test
checkout the .debug_info section of readelf output.
Thanks & Regards,
PraviN
On Thu, Aug 23, 2012 at 7:50 PM, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> wrote:
Hi..
try something like:
On Thu, Aug 23, 2012 at 4:37 PM, Pritam Bankar
<pritambankar1988@xxxxxxxxx> wrote:
> How to know default flags used in specific gcc version ? I am looking
> for difference between 3.4.3 and 4.1.1 These two have some difference
> regarding -nosse option but how can I find this ?
echo "" | gcc -E -v - 2>&1 | grep -i cc
and find the line like below:
/usr/lib/gcc/i686-linux-gnu/4.6/cc1 -E -quiet -v -imultilib .
-imultiarch i386-linux-gnu - -mtune=generic -march=i686
-fstack-protector
(that's mine on Core Duo, Linux Mint 13 32 bit)
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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Thanks & Regards,
---------PraviN---------
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