https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100610
Bug ID: 100610
Summary: DWARF5, wrong include_directories[0] when building in
/
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: simon.marchi at polymtl dot ca
Target Milestone: ---
If I build a trivial test file while in the /tmp directory:
$ pwd
/tmp
$ cat test.c
#include <stdio.h>
#define FOO 2
int main() {
return FOO;
}
$ /opt/gcc/git/bin/gcc -gdwarf-5 -g3 -O0 -o test test.c
The include_directories table of .debug_line looks fine:
$ readelf --debug-dump=rawline test
The Directory Table (offset 0x22, lines 7, columns 1):
Entry Name
0 (line_strp) (offset: 0x0): /tmp
1 (line_strp) (offset: 0xc): /usr/include
2 (line_strp) (offset: 0x19): /usr/include/bits
3 (line_strp) (offset: 0x2b): /usr/include/sys
4 (line_strp) (offset: 0x3c): /usr/include/gnu
5 (line_strp) (offset: 0x4d):
/opt/gcc/git/lib/gcc/x86_64-pc-linux-gnu/12.0.0/include
6 (line_strp) (offset: 0x85): /usr/include/bits/types
The File Name Table (offset 0x44, lines 26, columns 2):
Entry Dir Name
0 (udata) 0 (line_strp) (offset: 0x5): test.c
1 (udata) 0 (line_strp) (offset: 0x5): test.c
Files #0 and #1 point to directory 0, which gives /tmp/test.c.
However, if I move test.c in the root directory, at /test.c and move there:
$ pwd
/
$ /opt/gcc/git/bin/gcc -gdwarf-5 -g3 -O0 -o /tmp/test test.c
The Directory Table (offset 0x22, lines 7, columns 1):
Entry Name
0 (line_strp) (offset: 0x9): /usr/include
1 (line_strp) (offset: 0x9): /usr/include
2 (line_strp) (offset: 0x16): /usr/include/bits
3 (line_strp) (offset: 0x28): /usr/include/sys
4 (line_strp) (offset: 0x39): /usr/include/gnu
5 (line_strp) (offset: 0x4a):
/opt/gcc/git/lib/gcc/x86_64-pc-linux-gnu/12.0.0/include
6 (line_strp) (offset: 0x82): /usr/include/bits/types
The File Name Table (offset 0x44, lines 26, columns 2):
Entry Dir Name
0 (udata) 0 (line_strp) (offset: 0x0): test.c
1 (udata) 0 (line_strp) (offset: 0x0): test.c
See the files #0 and #1. They point to directory #0, which is /usr/include.
That makes it believe that the source file was at /usr/include/test.c. That
looks wrong to me.
