[EXT_EP-9294] Compiler may crash when auto as return type of uninstantiated member function in template class resolves to template parameter Created: 01/Mar/19  Updated: 19/Feb/20  Resolved: 01/Mar/19

Status: Fixed
Project: Embedded Software & Tools
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Bug Priority: Medium
Reporter: TI User Assignee: TI User
Resolution: Fixed Votes: 0
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Product: Code Generation Tools
Internal ID: CODEGEN-5986
Forum URL: https://e2e.ti.com/support/tools/ccs/f/81/t/778491
Found In Release: ARM_18.1.0.LTS
MSP430_18.1.0.LTS
C6000_8.3.0
ARM_18.12.0.LTS
ARM_19.6.0.STS
MSP430_18.12.0.LTS
MSP430_19.6.0.STS
Fix In Release: ARM_18.1.6.LTS
MSP430_18.1.6.LTS
ARM_19.6.0.STS
C6000_8.3.4
ARM_18.12.3.LTS
MSP430_19.6.0.STS
MSP430_18.12.3.LTS
Affected Platform/Device: default
Workaround: Avoid "auto" as the return type of a member function if its immediate resolution is a template parameter.

Or explicitly instantiate the class or function. In the given test case, there's a variable defined with type EventSubscriberTable<int>. To avoid the problem, then, include either

    template class EventSubscriberTable<int>;

or

    template auto EventSubscriberTable<int>::getBroadcastList(void);

in the source file.
Release Notes: Given a class definition like

template <typename T>
class Table {
public :
  auto getList(void) { return m_Callbacks; }

private :
  T m_Callbacks;
};

where the member function getList() returns "auto" and that "auto" can be seen to be "T", and this program:

int main(int argc, char* argv[])
{
    Table<int> m_Table;
    return 0;
}

in which the Table class is instantiated but the function getList() is never used, the compiler may crash.

The problem requires the combination of auto, template parameter, and uninstantiated function. Changing any of those details will avoid it.

 Description   

Compiler may crash when auto as return type of uninstantiated member function in template class resolves to template parameter
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