Detect GCC compile-time flags of a binary


Detect GCC compile-time flags of a binary



Is there a way to find out what gcc flags a particular binary was compiled with?




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1:



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causes the command line that was used to invoke the compiler to be recorded into the object file that is being created.

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2:


Experimental proof:.
diciu$ gcc -O2 /tmp/tt.c -o /tmp/a.out.o2 diciu$ gcc -O3 /tmp/tt.c -o /tmp/a.out.o3 diciu$ diff /tmp/a.out.o3 /tmp/a.out.o2  diciu$ 
I take that as a no as the binaries are identical..


3:


I'm the one who asked Brian to post this originally.

My question had to do with the samba binary.

I found out that you can run smb -b to get information on how it was built..


4:


I don't think so.

. You can see if it has debug symbols, which means -g was used ;) But I can't think of any way how you could find out which directories have been used to search for include headers for example.. Maybe a better answer is possible if you only target for a specific flag; e.g.

if you only want to know if the flag "..." was set when this binary was compiled or not.

In that case, what flag would this be?.



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