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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLVM ERROR when using flto, debug and instrument-functions after r318199"
href="https://bugs.llvm.org/show_bug.cgi?id=35412">35412</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LLVM ERROR when using flto, debug and instrument-functions after r318199
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ilia.taraban@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This test fails at compilation when using "flto", "g" and
"finstrument-functions" after 318199 revision:
================= nice.c ==============
int main()
{
return 0;
}
=======================================
============ profile_funcs.c ==========
void __cyg_profile_func_enter (void *this_fn, void *call_site) {}
void __cyg_profile_func_exit (void *this_fn, void *call_site) {}
=======================================
<span class="quote">>>> clang -v</span >
clang version 6.0.0 (trunk 318198)
Target: x86_64-unknown-linux-gnu
Thread model: posix
...
<span class="quote">>>> clang -c -g -flto -finstrument-functions nice.c
>>> clang -c -g -flto profile_funcs.c
>>> clang -g -flto nice.o profile_funcs.o</span >
=============== nice.o.ll =============
...
define i32 @main() #0 !dbg !7 {
entry:
%retval = alloca i32, align 4
%callsite = call i8* @llvm.returnaddress(i32 0), !dbg !11
call void @__cyg_profile_func_enter(i8* bitcast (i32 ()* @main to i8*), i8*
%callsite) #2, !dbg !11
store i32 0, i32* %retval, align 4
store i32 0, i32* %retval, align 4, !dbg !12
%callsite1 = call i8* @llvm.returnaddress(i32 0), !dbg !11
call void @__cyg_profile_func_exit(i8* bitcast (i32 ()* @main to i8*), i8*
%callsite1) #2, !dbg !11
%0 = load i32, i32* %retval, align 4, !dbg !12
ret i32 %0, !dbg !12
}
...
=======================================
Now let's look after commit:
<span class="quote">>>> clang -v</span >
clang version 6.0.0 (trunk 318199)
Target: x86_64-unknown-linux-gnu
Thread model: posix
...
<span class="quote">>>> clang -c -g -flto -finstrument-functions nice.c
>>> clang -c -g -flto profile_funcs.c
>>> clang -g -flto nice.o profile_funcs.o</span >
inlinable function call in a function with debug info must have a !dbg location
call void @__cyg_profile_func_enter(i8* bitcast (i32 ()* @main to i8*), i8*
%1)
inlinable function call in a function with debug info must have a !dbg location
call void @__cyg_profile_func_exit(i8* bitcast (i32 ()* @main to i8*), i8*
%3)
inlinable function call in a function with debug info must have a !dbg location
call void @__cyg_profile_func_enter(i8* bitcast (i32 ()* @main to i8*), i8*
%1)
inlinable function call in a function with debug info must have a !dbg location
call void @__cyg_profile_func_exit(i8* bitcast (i32 ()* @main to i8*), i8*
%3)
LLVM ERROR: Broken module found, compilation aborted!
clang-6.0: error: linker command failed with exit code 1 (use -v to see
invocation)
=============== nice.o.ll =============
...
define i32 @main() #0 !dbg !7 {
entry:
%0 = call i8* @llvm.returnaddress(i32 0)
call void @__cyg_profile_func_enter(i8* bitcast (i32 ()* @main to i8*), i8*
%0)
%retval = alloca i32, align 4
store i32 0, i32* %retval, align 4
%1 = call i8* @llvm.returnaddress(i32 0)
call void @__cyg_profile_func_exit(i8* bitcast (i32 ()* @main to i8*), i8*
%1)
ret i32 0, !dbg !11
}
...
=======================================</pre>
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