I think this still affects package GCC-10 on both focal and groovy.
Specifically the second repro posted above still crashes GCC. I'm
repeating it here for clarity:
```
a;
b() {
int c, d;
__sigsetjmp();
for (; a;)
for (; d;) {
if (c)
c = e();
f();
}
}
```
putting the repro into `/tmp/c.c` and running `gcc-10 -O3 -c /tmp/c.c`
triggers the bug:
```
c.c:1:1: warning: data definition has no type or storage class
1 | a;
| ^
c.c:1:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
c.c:2:1: warning: return type defaults to 'int' [-Wimplicit-int]
2 | b() {
| ^
c.c: In function 'b':
c.c:4:3: warning: implicit declaration of function '__sigsetjmp'
[-Wimplicit-function-declaration]
4 | __sigsetjmp();
| ^~~~~~~~~~~
c.c:8:13: warning: implicit declaration of function 'e'
[-Wimplicit-function-declaration]
8 | c = e();
| ^
c.c:9:7: warning: implicit declaration of function 'f'
[-Wimplicit-function-declaration]
9 | f();
| ^
Unable to coalesce ssa_names 3 and 4 which are marked as MUST COALESCE.
c_3(ab) and c_4(ab)
during RTL pass: expand
c.c:2:1: internal compiler error: SSA corruption
2 | b() {
| ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-10/README.Bugs> for instructions.
```
I tried the same repro on hirsute today and cannot reproduce the error.
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https://bugs.launchpad.net/bugs/1899114
Title:
internal compiler error: SSA corruption
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