https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89730
Bug ID: 89730
Summary: -flive-patching=inline-only-static should grant
always_inline attribute for extern function
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: qinzhao at gcc dot gnu.org
Target Milestone: ---
for the following small testing case:
extern int sum, n, m;
extern inline __attribute__((always_inline)) int foo (int a);
inline __attribute__((always_inline)) int foo (int a)
{
return a + n;
}
static int bar (int b)
{
return b * m;
}
int main()
{
sum = foo (m) + bar (n);
return 0;
}
with the latest upstream gcc9:
/home/qinzhao/Install/latest/bin/gcc -O3 -flive-patching=inline-only-static
-fdump-tree-einline -fdump-ipa-inline -fopt-info-inline-all=inline.txt t.c
t.c: In function ‘main’:
t.c:7:43: error: inlining failed in call to always_inline ‘foo’: function has
external linkage when the user requests only inlining static for live patching
7 | inline __attribute__((always_inline)) int foo (int a)
| ^~~
t.c:20:9: note: called from here
20 | sum = foo (m) + bar (n);
| ^~~~~~~
t.c:7:43: error: inlining failed in call to always_inline ‘foo’: function has
external linkage when the user requests only inlining static for live patching
7 | inline __attribute__((always_inline)) int foo (int a)
| ^~~
t.c:20:9: note: called from here
20 | sum = foo (m) + bar (n);
| ^~~~~~~
We should grant extern alway_inline routine to be inlined even with
-flive-patching=inline-only-static.
