| Issue |
177040
|
| Summary |
[flang][debug] DW_TAG_imported_module missing for simple USE statement after #168541
|
| Labels |
flang
|
| Assignees |
|
| Reporter |
jiel-nv
|
#### Description
After commit dc9c08e6e0081ae0799597ba5f95ca5a6eddeac0 ([flang][debug] Generate DWARF debug info using fir.use_stmt. (#168541)), simple use module_name statements no longer emit DW_TAG_imported_module in DWARF debug info, causing debuggers like GDB to fail to find module variables.
#### Reproducer
```
module test_module
integer :: module_variable
end module test_module
program module_test
use test_module
implicit none
module_variable = 1
print *,'module_variable = ',module_variable
end program module_test
```
#### Compile and debug
```
flang -g -o test.out test.f90
gdb -q -ex "b 10" -ex "r" -ex "p module_variable" -ex "q" test.out
```
#### Expected Behavior
GDB should print:
`$1 = 1`
#### Actual Behavior
GDB reports:
`No symbol "module_variable" in current context.`
#### Root Cause
The DWARF output is missing DW_TAG_imported_module for the use test_module statement.
Before dc9c08e (working):
```
0x00000052: DW_TAG_subprogram
DW_AT_name ("MODULE_TEST")
...
0x0000006c: DW_TAG_imported_module <-- PRESENT
DW_AT_decl_file ("test.f90")
DW_AT_decl_line (1)
DW_AT_import (0x0000002a "test_module")
```
After dc9c08e (broken):
```
0x00000052: DW_TAG_subprogram
DW_AT_name ("MODULE_TEST")
...
<-- MISSING DW_TAG_imported_module!
```
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