missing FILE symbol for .(s|S) files

[llvmbot]

Bugzilla Link	34019
Version	unspecified
OS	All
Reporter	LLVM Bugzilla Contributor
CC	@pogo59

Extended Description

Hello

When compiling .(s|S) files with clang, a FILE symbol is missing from the object file, unless explicitly setting one with the .file directive. Not using the integrated as, also fixes the issue:

$ clang -g bzero.S a.c && readelf -Ws a.out | grep FILE 33: 0000000000000000 0 FILE LOCAL DEFAULT ABS a.c

$ clang -no-integrated-as -g bzero.S a.c && readelf -Ws a.out | grep FILE 31: 0000000000000000 0 FILE LOCAL DEFAULT ABS bzero.S 33: 0000000000000000 0 FILE LOCAL DEFAULT ABS a.c

$ gcc -g bzero.S a.c && readelf -Ws a.out | grep FILE
31: 0000000000000000 0 FILE LOCAL DEFAULT ABS bzero.S 33: 0000000000000000 0 FILE LOCAL DEFAULT ABS a.c

This seems like a bug and the FILE symbol should be added with the integrated as as well.

Thank you!

[llvmbot]

I see no reason why using the integrated assembler vs gas should differ here so this is a bug.

Can you add your patch and a test case on phabricator (reviews.llvm.org)?

[llvmbot]

It's been more than a month now. Any input anyone?

[llvmbot]

emit file directive all the time Second patch makes sure to always emit the file directive even if -g is used and avoids adding an empty or an - (stdin) entry.

[llvmbot]

emit file directive if not generating dwarf The patch that I've attached works for me and generates the proper file directive for the non-dwarf case.

[llvmbot]

Is this a bug, undefined behaviour or intended?