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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/104961] New: compilation never (?) finishes at
 -Og
Date: Wed, 16 Mar 2022 21:29:42 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: compile-time-hog, memory-hog
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104961

            Bug ID: 104961
           Summary: compilation never (?) finishes at -Og
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog, memory-hog
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 52638
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52638&action=3Dedit
reduced testcase

Compiler output:
$ time x86_64-pc-linux-gnu-gcc -O testcase.c -c

real    0m0.034s
user    0m0.028s
sys     0m0.007s

$ time x86_64-pc-linux-gnu-gcc -Og testcase.c -c
^C

real    2m5.070s
user    0m0.001s
sys     0m0.000s


The compilation doesn't seem to ever finish. The cc1 binary is just eating =
more
memory over time.

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=3D/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-g=
cc
COLLECT_LTO_WRAPPER=3D/repo/gcc-trunk/binary-trunk-r12-7654-20220315102422-=
gda24fce323e-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc=
/x86_64-pc-linux-gnu/12.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=3Dc,c++
--enable-valgrind-annotations --disable-nls --enable-checking=3Dyes,rtl,df,=
extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=3Dx86_64-pc-linux-gnu --host=3Dx86_64-pc-linux-gnu
--target=3Dx86_64-pc-linux-gnu --with-ld=3D/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=3D/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=3D/repo/gcc-trunk//binary-trunk-r12-7654-20220315102422-gda24fce32=
3e-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.1 20220315 (experimental) (GCC)=