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* [Bug ipa/93115] gcc fails to emit inline function on llvm-roc project: -O1 -fPIC -fdevirtualize -fdevirtualize-speculatively -fipa-cp -fipa-cp-clone -fvisibility-inlines-hidden
[not found] <bug-93115-4@http.gcc.gnu.org/bugzilla/>
@ 2020-10-03 9:12 ` slyfox at gcc dot gnu.org
2021-02-08 13:30 ` slyfox at gcc dot gnu.org
2021-02-08 17:16 ` slyfox at gcc dot gnu.org
2 siblings, 0 replies; 3+ messages in thread
From: slyfox at gcc dot gnu.org @ 2020-10-03 9:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93115
Sergei Trofimovich <slyfox at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |slyfox at gcc dot gnu.org
--- Comment #6 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Still happens with gcc-11.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug ipa/93115] gcc fails to emit inline function on llvm-roc project: -O1 -fPIC -fdevirtualize -fdevirtualize-speculatively -fipa-cp -fipa-cp-clone -fvisibility-inlines-hidden
[not found] <bug-93115-4@http.gcc.gnu.org/bugzilla/>
2020-10-03 9:12 ` [Bug ipa/93115] gcc fails to emit inline function on llvm-roc project: -O1 -fPIC -fdevirtualize -fdevirtualize-speculatively -fipa-cp -fipa-cp-clone -fvisibility-inlines-hidden slyfox at gcc dot gnu.org
@ 2021-02-08 13:30 ` slyfox at gcc dot gnu.org
2021-02-08 17:16 ` slyfox at gcc dot gnu.org
2 siblings, 0 replies; 3+ messages in thread
From: slyfox at gcc dot gnu.org @ 2021-02-08 13:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93115
--- Comment #7 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Looks like original test does not trigger the bug as is (probably due to tets
fragility). Here is something shorter (but with warnings):
```c++
struct a {
char at;
char au;
int d() { return av() + au - at; }
virtual void f() {}
virtual int av() { }
};
struct g : a {
void f();
char b;
char c() { return b; }
} b;
#ifdef MAIN_FILE
g e;
void h() {
if (b.c()) {
e.d();
return;
}
}
int main() {}
#endif
#ifdef LIB_FILE
void g::f() {}
#endif
```
$ g++-11.0.0 -Wall -fPIC -O1 -fdevirtualize -fdevirtualize-speculatively
-fipa-cp -fipa-cp-clone -fvisibility-inlines-hidden -fPIC -shared -o libbug.so
bug.cpp -DLIB_FILE
bug.cpp: In member function 'virtual int a::av()':
bug.cpp:6:22: warning: no return statement in function returning non-void
[-Wreturn-type]
6 | virtual int av() { }
| ^
$ g++-11.0.0 -Wall -fPIC -O1 -fdevirtualize -fdevirtualize-speculatively
-fipa-cp -fipa-cp-clone -fvisibility-inlines-hidden -o main bug.cpp -DMAIN_FILE
-L. -lbug
bug.cpp: In member function 'virtual int a::av()':
bug.cpp:6:22: warning: no return statement in function returning non-void
[-Wreturn-type]
6 | virtual int av() { }
| ^
/usr/lib/gcc/x86_64-pc-linux-gnu/11.0.0/../../../../x86_64-pc-linux-gnu/bin/ld:
/tmp/ccbaHYef.o: in function `h()':
bug.cpp:(.text+0x1a): undefined reference to `a::av()'
collect2: error: ld returned 1 exit status
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug ipa/93115] gcc fails to emit inline function on llvm-roc project: -O1 -fPIC -fdevirtualize -fdevirtualize-speculatively -fipa-cp -fipa-cp-clone -fvisibility-inlines-hidden
[not found] <bug-93115-4@http.gcc.gnu.org/bugzilla/>
2020-10-03 9:12 ` [Bug ipa/93115] gcc fails to emit inline function on llvm-roc project: -O1 -fPIC -fdevirtualize -fdevirtualize-speculatively -fipa-cp -fipa-cp-clone -fvisibility-inlines-hidden slyfox at gcc dot gnu.org
2021-02-08 13:30 ` slyfox at gcc dot gnu.org
@ 2021-02-08 17:16 ` slyfox at gcc dot gnu.org
2 siblings, 0 replies; 3+ messages in thread
From: slyfox at gcc dot gnu.org @ 2021-02-08 17:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93115
--- Comment #8 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Slightly better example without warnings (used `__builtin_trap();` to work
around use of uninitialized value):
```c++
struct a {
char ac1;
char ac2;
int d() { return av() + ac1 + ac2; }
virtual void f() {}
virtual int av() { __builtin_trap(); }
a(){}
};
struct g : a {
virtual void f2();
g():a(){}
};
#ifdef LIB_FILE
void g::f2() {}
#endif
#ifdef MAIN_FILE
static g b;
static char bb;
char cc() { return bb; }
void h() {
if (cc()) {
b.d();
return;
}
}
int main() {}
#endif
```
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-02-08 17:16 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-93115-4@http.gcc.gnu.org/bugzilla/>
2020-10-03 9:12 ` [Bug ipa/93115] gcc fails to emit inline function on llvm-roc project: -O1 -fPIC -fdevirtualize -fdevirtualize-speculatively -fipa-cp -fipa-cp-clone -fvisibility-inlines-hidden slyfox at gcc dot gnu.org
2021-02-08 13:30 ` slyfox at gcc dot gnu.org
2021-02-08 17:16 ` slyfox at gcc dot gnu.org
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