https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85893
Bug ID: 85893
Summary: [regression] Variables promoted to Gimple registers by
aliasing are not getting debug statements (if -flto
used).
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: jason.vas.dias at gmail dot com
CC: marxin at gcc dot gnu.org
Target Milestone: ---
After building gcc-5-branch, gcc-6-branch, and gcc-7-branch,
on an x86_64 Linux glibc-2.17 + binutils 2.30 (also on a
glibc-2.27 + binutils 2.30 system), they all fail the
gcc.dg/guality/pr41616-1.C testsuite test with any
'-flto' enabling arguments:
Without -flto enabled, the tests pass:
../xgcc -B../gcc/ ../gcc.dg/guality/pr41616-1.c ...\
-flto -fno-use-linker-plugin -flto-partition=none \
-O2 -g -fgnu89-inline -lm -o ./pr41616-1.exe
spawn [open ...]
PASS: b is -1
PASS: b is 1
PASS: 2 PASS, 0 FAIL, 0 UNRESOLVED
PASS: gcc.dg/guality/pr41616-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none execution test
...
With -flto enabled, they fail:
../xgcc -B../gcc/ ../gcc.dg/guality/pr41616-1.c ...\
-flto -fuse-linker-plugin -fno-fat-lto-objects \
-O2 -g -fgnu89-inline -lm -o ./pr41616-1.exe
spawn [open ...]
PASS: b is -1
FAIL: b is -1, not 1
FAIL: 1 PASS, 1 FAIL, 0 UNRESOLVED
FAIL: gcc.dg/guality/pr41616-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects execution test
This happens with builds of gcc-5.5.0, gcc-6.4.1, and gcc-7.3.1 .
All other -flto testsuite tests of these builds are passing.
