| Issue |
144312
|
| Summary |
[Clang] C++ Modules: Setting section attribute on variable in module causes miscompilation
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
Gurah
|
Setting the output section of a variable by attribute in a module interface causes miscompilation.
Code works fine if not using c++ modules or if removing section attribute.
**Example**
test.ccm:
```
export module test;
int foo __attribute__((section(".data.foo"))) = 2;
export int get_foo()
{
return foo;
}
export void set_foo(int val)
{
foo = val;
}
```
main.cc:
```
import test;
int main()
{
set_foo(5);
return get_foo();
}
```
Compile and run:
clang++ -std=c++23 -O1 -c test.ccm -fmodule-output=test.pcm
clang++ -std=c++23 -O1 -c main.cc -fmodule-file=test=test.pcm
clang++ test.o main.o -o test
./test
echo $?
**Expected result:**
5
**Actual result:**
2
**Clang version**
clang++ --version
clang version 19.1.7
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
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