In bug #784923 we found out that portage complains about pre-stripped files on glibc due to binutils-2.36 not emitting unused ".symtab". Executable exeample: $ cat > crtn.S .section .init,"ax",@progbits addq $8, %rsp ret .section .fini,"ax",@progbits addq $8, %rsp ret $ x86_64-pc-linux-gnu-gcc -O2 crtn.S -c -o crtn-2.36.o # -B/usr/x86_64-pc-linux-gnu/binutils-bin/2.35.2/ $ x86_64-pc-linux-gnu-gcc -O2 crtn.S -c -o crtn-2.35.o -B/usr/x86_64-pc-linux-gnu/binutils-bin/2.35.2/ $ scanelf -yqRBF '#k%F' -k '!.symtab' crtn-2.35.o crtn-2.36.o crtn-2.36.o Note: 2.36 file does not contain '.symtab' that portage expects as a proxy of unstripped binary: https://gitweb.gentoo.org/proj/portage.git/tree/bin/estrip#n329
bug #795810 is another example where ELF file without program headers is slagged as "stripped". `readelf` complains on these files as: "There are no program headers in this file."
Ideally `scanelf` should provide a mechanism for us to finter on files with program headers only. I don't think it has that as a one-liner. I wonder if '#e' is expected to Just work. It does not today: $ scanelf -yqRBF '#e#k%F' -k '!.symtab' crtn-2.36.o crtn-2.36.o
(In reply to Sergei Trofimovich from comment #2) > Ideally `scanelf` should provide a mechanism for us to finter on files with > program headers only. I don't think it has that as a one-liner. > > I wonder if '#e' is expected to Just work. It does not today: > > $ scanelf -yqRBF '#e#k%F' -k '!.symtab' crtn-2.36.o > crtn-2.36.o Ah, it does not work as is because '#e#k' works as "any of", not "all of".
Also, absence of program headers is expected: It's not a final executable. We'll need a different, heuristic. Maybe, presence of non-empty executable PROGBITS sections: [ 1] .text PROGBITS 0000000000000000 00000040 0000000000000007 0000000000000000 AX 0 0 1
Later code in estrip uses 'file' to check type of file: https://gitweb.gentoo.org/proj/portage.git/tree/bin/estrip?id=36dbd3e4336fa199a35b4f74c1679511707138f5#n492 f=$(file "${x}") || exit 0 ... if [[ ${f} == *"current ar archive"* ]] ; then process_ar "${x}" elif [[ ${f} == *"SB executable"* || ${f} == *"SB pie executable"* || ${f} == *"SB shared object"* ]] ; then process_elf "${x}" "${inode_link}" ${PORTAGE_STRIP_FLAGS} elif [[ ${f} == *"SB relocatable"* ]] ; then process_elf "${x}" "${inode_link}" ${SAFE_STRIP_FLAGS} fi So maybe earlier code in estrip (https://gitweb.gentoo.org/proj/portage.git/tree/bin/estrip?id=36dbd3e4336fa199a35b4f74c1679511707138f5#n406) should ignore *"SB relocatable"* files (i.e. *.o files)?
