http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51936
Bug #: 51936
Summary: template function not instantiated
Classification: Unclassified
Product: gcc
Version: 4.6.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: [email protected]
ReportedBy: [email protected]
Created attachment 26405
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26405
test case
It appears that in some circumstances g++ fails to instantiate a template
function, and so end up in link time errors.
Consider the code in attachment. If compiled with:
g++ -Wall -std=c++0x testcase.cpp
the result is:
testcase.cpp:(.text+0x13): undefined reference to `int asd<int, 0>(int*)'
collect2: ld returned 1 exit status
whereas if compiled with:
g++ -Wall -std=c++0x -DWORKAROUND testcase.cpp
it does warn for the unused variable 'inted', but compiles and run correctly.
It looks like that getting the pointer of a template function and immediately
cast it to something else "weakens" the usage of the template, so that g++
doesn't instantiate it.
