https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93703
Bug ID: 93703
Summary: global const getting lost in g++
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: felix-gcc at fefe dot de
Target Milestone: ---
I suspect this is my mistake, not gcc's, but I'm out of ideas so sorry for
wasting your time if that is true.
Here is my situation:
$ cat a.cc
const int foo = 23;
$ cat b.cc
extern const int foo;
int main() {
return foo;
}
$ g++ -o x a.cc b.cc
/usr/lib64/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../x86_64-pc-linux-gnu/bin/ld:
/tmp/ccXS1J5J.o: in function `main':
b.cc:(.text+0x6): undefined reference to `foo'
collect2: error: ld returned 1 exit status
$
Wait, what?
$ g++ -c a.cc b.cc && nm a.o b.o
a.o:
0000000000000000 r _ZL3foo
b.o:
U foo
0000000000000000 T main
$
What the...? Why is foo mangled in a.o but not in b.o?
I tried this with clang++ too and there it's even worse: a.o is empty and does
not even export a mangled foo.
What am I missing?
