[Bug libc/28153] New: [test] gmon/tst-gmon-gprof* may have a f3 line when built with ld.lld

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=28153

            Bug ID: 28153
           Summary: [test] gmon/tst-gmon-gprof* may have a f3 line when
                    built with ld.lld
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Extracted from
https://sourceware.org/pipermail/libc-alpha/2021-July/129450.html

To build LLD 13.0.0:

# https://github.com/llvm/llvm-project/ origin/release/13.x
cmake -H. -Bout/release -G Ninja -DCMAKE_BUILD_TYPE=Release
-DLLVM_ENABLE_PROJECTS='clang;lld'
ninja -C out/release lld

I use
sudo ln -sf out/release/bin/lld /usr/local/bin/ld
to ensure the glibc build system definitely picks ld => lld
(messing around with LDFLAGS=-fuse-ld=lld may work as well)


For gmon/tst-gmon-gprof*, ld.lld linked tst-gmon-gprof has a f3 line, which is
considered a failure by the test. However, having the f3 line appears more
correct to me. I am unclear why ld.bfd tst-gmon-gpro doesn't have f3.

% cat gmon/tst-gmon-gprof.out
--- expected
+++ actual
@@ -1,2 +1,3 @@
 f1 2000
 f2 1000
+f3 1
FAIL

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