https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103766
Bug ID: 103766
Summary: [12 Regression] Initialization of variable passed via
static chain is lost.
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: iains at gcc dot gnu.org
Target Milestone: ---
In the following code (by FX)
program crash
implicit none
real :: a
a = 1.
call sub()
contains
subroutine sub()
print *, a
end subroutine sub
end program crash
when we build with O0, we get the correct result
for O >= 1 we get a random number
What appears to be happening is that the crash () routine is inlined into main
() but the code that initialises the frame (including the 'a' variable) is
dropped which means that sub() sees and prints an uninitialised var.
