Hello,
I am observing a weird behavior in clang, inconsistent with gcc.
Consider the following file (bug.c):
extern int x;
int main()
{
#line 10 “foo.c”
{
#line 100 “bug.c”
int y=0;
}
++x;
return 0;
}
Obviously building it fails in the linking stage, as “x” is undefined. That’s fine.
The problem is that clang reports the “++x” coming from a wrong file.
I expected to see the report on “bug.c”, line 102.
However, clang reports it on “foo.c”, line 102.
i.e. in the last #line pragma (#line 100 “bug.c”) it used the line information “100”, but ignored the file information “bug.c”
Here’s the command line I used:
clang -g bug.c -o bug.out
And this is the output it produced:
/usr/lib64/gcc/x86_64-suse-linux/4.1.2/…/…/…/…/x86_64-suse-linux/bin/ld: Dwarf Error: Invalid or unhandled FORM value: 25.
/usr/lib64/gcc/x86_64-suse-linux/4.1.2/…/…/…/…/x86_64-suse-linux/bin/ld: Dwarf Error: Invalid or unhandled FORM value: 25.
/tmp/bug-4lmk6q.o: In functionmain': ..../**foo.c:102**: undefined reference tox’
…/foo.c:102: undefined reference to `x’
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I observed this on the on version 3.1, 3.2 and the latest code from the trunk.
Any ideas?
Much thanks,
Eran