https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87501
Bug ID: 87501
Summary: lto1: error: Alias and target's section differs
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: hubicka at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
It's also an older issue:
$ cat 1.ii
struct a {
virtual void f();
};
struct b : a {};
struct S : a, b {
void f() {}
};
main() { S c; }
$ cat 2.ii
struct S {
void f();
};
void S::f() {}
$ g++ -flto 1.ii 2.ii -fchecking
1.ii:5:8: warning: direct base ‘a’ inaccessible in ‘S’ due to ambiguity
struct S : a, b {
^
1.ii:8:6: warning: ISO C++ forbids declaration of ‘main’ with no type
[-Wreturn-type]
main() { S c; }
^
1.ii:5:8: warning: type ‘struct S’ violates the C++ One Definition Rule [-Wodr]
struct S : a, b {
^
2.ii:1:8: note: a type with different bases is defined in another translation
unit
struct S {
^
1.ii:6:8: warning: ‘f’ violates the C++ One Definition Rule [-Wodr]
void f() {}
^
2.ii:4:6: note: implicit this pointer type mismatch
void S::f() {}
^
2.ii:1:8: note: type ‘struct S’ itself violates the C++ One Definition Rule
struct S {
^
1.ii:5:8: note: the incompatible type is defined here
struct S : a, b {
^
2.ii:4:6: note: ‘f’ was previously declared here
void S::f() {}
^
2.ii:4:6: note: code may be misoptimized unless -fno-strict-aliasing is used
lto1: error: Alias and target's section differs
_ZN1S1fEv/26 (f) @0x7ffff657c5c0
Type: function definition analyzed
Visibility: force_output externally_visible no_reorder prevailing_def_ironly
public
Address is taken.
References:
Referring: *.LTHUNK0/1 (alias)_ZTV1S/13 (addr)
Read from file: /tmp/ccaPfjxk.o
First run: 0
Function flags:
Called by:
Calls:
lto1: error: Alias and target's comdat groups differs
_ZN1S1fEv/26 (f) @0x7ffff657c5c0
Type: function definition analyzed
Visibility: force_output externally_visible no_reorder prevailing_def_ironly
public
Address is taken.
References:
Referring: *.LTHUNK0/1 (alias)_ZTV1S/13 (addr)
Read from file: /tmp/ccaPfjxk.o
First run: 0
Function flags:
Called by:
Calls:
*.LTHUNK0/1 (*.LTHUNK0) @0x7ffff657c170
Type: function definition analyzed alias
Visibility: comdat_group:_ZN1S1fEv section:.text._ZN1S1fEv (implicit_section)
artificial
Same comdat group as: _ZThn8_N1S1fEv/2
References: _ZN1S1fEv/26 (alias)
Referring:
Read from file: /tmp/ccF6bEVE.o
First run: 0
Function flags:
Called by: _ZThn8_N1S1fEv/2 (can throw external)
Calls:
(null):0: confused by earlier errors, bailing out
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/usr/lib64/gcc/x86_64-suse-linux/8/../../../../x86_64-suse-linux/bin/ld: error:
lto-wrapper failed
collect2: error: ld returned 1 exit status
