Hi, this is a short progress report (with a current patch ontop of the debug-early branch attached).
So I worked towards making regular non-LTO mode output DWARF in two stages,
early (before .text) and late (after .text). I've also prototyped the
LTO side (BLOCK support
still missing) to show what breaks in dwarf2out.c - only
-flto-partition=none is currently
supported because I'm lazy. Also only a single CU ;)
What works is the following C testcase:
typedef int Mint;
struct X { Mint res; };
int main(int argc, char **argv) { { struct X x; x.res = 0; Mint res =
x.res; return res; } }
and the following C++ testcase:
class X { public: X(int r) : res(r) {} int get() { return res; }
private: int res; };
int main() { X x(0); return x.get (); }
they work in the non-LTO mode only (well, didn't check the LTO side yet). Work
means I can debug them with gdb (7.9 tested) and the DWARF looks like I expect
it to look for LTO.
There is no support yet in the LTO driver (so the early debuginfo
section will be
missing in the final object), but I currently ICE always anyway. The late dwarf
generation doesn't quite work in an ideal way (sharing the central
dwarf2out_decl
path ... :/), but well.
Richard.
early-lto-debug-day1
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