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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - unable to access optimized away parameters, clang Debugging Optimized Code"
href="https://bugs.llvm.org/show_bug.cgi?id=43289">43289</a>
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<th>Summary</th>
<td>unable to access optimized away parameters, clang Debugging Optimized Code
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Keywords</th>
<td>new-feature
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>sourav0311@gmail.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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</tr></table>
<p>
<div>
<pre>For CLANG compiled following test case, GDB is not able access and locate
optimized away parameters.
CLANG 10, gdb 8.3 --used
$clang++ -Xclang -femit-debug-entry-values -O2 -ggdb test1.cpp
#include <iostream>
int func(int* ptr){
std::cout << *ptr;
return *ptr + 5;
}
int main(int argc, char** argv){
int a = 4;
int* ptr_a = &a;
int b = func(ptr_a);
return 0;
}
gdb -q a.out -ex "b func" -ex "r" -ex "print ptr"
Reading symbols from a.out...
Breakpoint 1 at 0x2010f4: func. (2 locations)
Starting program: /home/sourabh/work/dwarf/c_c++/c++11/a.out
Breakpoint 1, func (ptr=<optimized out>) at ../doc/test1.cpp:4
4 std::cout << *ptr;
$1 = <optimized out>
(gdb) print *ptr
value has been optimized out</pre>
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