https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87680
Bug ID: 87680
Summary: Small program produces 400 meg .s file
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gnu at kosak dot com
Target Milestone: ---
This small program takes over a minute to compile and produces a 160 meg object
file. sizeof(Bar) is large and it looks like the compiler wants to write down a
precompiled version of it to the object file for the benefit of Bar's
constructor. There are no static variables or anything like that so the object
file really should be modest in size.
% cat test.cc
constexpr int size = 10000000;
class Foo {
int a = 10;
int b = 11;
int c = 12;
int d = 13;
};
class Bar {
Foo foo[size];
};
void somefunc(const Bar *);
int main() {
Bar *bar = new Bar();
somefunc(bar);
}
% time g++ -O2 -c test.cc
real 1m9.696s
user 1m6.486s
sys 0m2.806s
% ls -l test.o
-rw-rw-r-- 1 kosak kosak 160001760 Oct 22 01:41 test.o
