On Wed, 30 Sep 2020 01:31:29 +0200, Jeff Law wrote:
> -fdebug-types-section a supported option in the sense that it's in the
> compiler and we'll fix bugs in it when we can. But the GCC community
> doesn't really test that option and it's known to be broken with LTO.
I believe you base this information on Jakub Jelinek's internal company mail:
Message-ID: <20200710092926.GJ2363@tucnak>
IIUC that mail contains incorrect information.
My apologies if my deduction is incorrect, I am also writing "IIUC" here.
I am basing my information on explanation by GCC developer Richard Biener:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88878#c8
It is explained there "in_lto_p" means GCC is in second/later phase of LTO.
Not that LTO is enabled at all (as Jakub Jelinek said in the internal mail).
Also GCC does not produce ICEs (=compiler crash, (*)) Jakub Jelinek was
claiming will happen during the 20000+ packages rebuild with LTO and
-fdebug-types-section I have done.
So I really see no indication why GCC would not normally support
-fdebug-types-section even with LTO. Also it is so simple optimization of
DWARF there is no reason why there should be any longterm issues with it.
Jan
(*) There were 7 packages reproducing GCC crashes due to the following two GCC
Bugs specific to -fdebug-types-section.
That is unrelated to the topic of the "in_lto_p" condition discussed above.
ICE: fortran+gnat: build_abbrev_table, at dwarf2out.c: -g
-fdebug-types-section
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96471
ICE: c++: dwarf2out_abstract_function, at dwarf2out.c: -g
-fdebug-types-section
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96472
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