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From: "msebor at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/29588] New: Cannot find bounds of current function in Clang
Date: Tue, 20 Sep 2022 15:29:30 +0000
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X-Bugzilla-Version: HEAD
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29588

            Bug ID: 29588
           Summary: Cannot find bounds of current function in Clang
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: msebor at gmail dot com
  Target Milestone: ---

The latest GDB () as well as GNU gdb (GDB) Fedora 11.1-5.fc35 fails with the
following error when debugging the top of tree Clang.  LLDB 13.0.0 works fi=
ne.

$ ~/bin/gdb-13.0.50.20220919/bin/gdb -nx -q -ex 'break
clang::Sema::VerifyIntegerConstantExpression' -ex 'r -S t.C' -ex n -ex n
/build/llvm-clang/bin/clang
Reading symbols from /build/llvm-clang/bin/clang...
Function "clang::Sema::VerifyIntegerConstantExpression" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (clang::Sema::VerifyIntegerConstantExpression) pending.
Starting program: /ssd/build/llvm-clang/bin/clang -S t.C

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.fedoraproject.org/>
Enable debuginfod for this session? (y or [n]) y
Debuginfod has been enabled.
To make this setting permanent, add 'set debuginfod enabled on' to .gdbinit.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Breakpoint 1, 0x00007fffe32ee180 in
clang::Sema::VerifyIntegerConstantExpression(clang::Expr*, llvm::APSInt*,
clang::Sema::AllowFoldKind)@plt ()
   from /ssd/build/llvm-clang/bin/../lib/../lib/libclangSema.so.16git
Single stepping until exit from function
_ZN5clang4Sema31VerifyIntegerConstantExpressionEPNS_4ExprEPN4llvm6APSIntENS=
0_13AllowFoldKindE@plt,
which has no line number information.
0x00007fffe32e5840 in ?? ()
   from /ssd/build/llvm-clang/bin/../lib/../lib/libclangSema.so.16git
Cannot find bounds of current function

To reproduce git clone the latest Clang, build it with GCC (I used gcc vers=
ion
11.2.1 20220127 (Red Hat 11.2.1-9) (GCC)), and run it as shown above with t=
he
following in t.C:

enum { e =3D "" !=3D 0 };

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