[llvm-bugs] [Bug 46488] New: [thinLTO] Unable to compile with IFUNC symbol

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46488

            Bug ID: 46488
           Summary: [thinLTO] Unable to compile with IFUNC symbol
           Product: new-bugs
           Version: trunk
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: och95 at yandex.ru
          Reporter: och95 at yandex.ru
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org
          Assignee: och95 at yandex.ru

The code example:

$ cat thinlto-ifunc.c
typedef int (*func)(void);

int called(void)
{
    return 1;
}

func resolver(void)
{
    return called;
}

__attribute__ ((ifunc ("resolver"))) int foo(void);

int main(int argc, char *argv[])
{
    foo();
}

$ clang -O3 -flto=thin thinlto-ifunc.c -o out
/usr/bin/ld: /tmp/lto-llvm-1798eb.o: in function `main':
thinlto-ifunc.c:(.text.main+0x2): undefined reference to `resolver'
clang: error: linker command failed with exit code 1 (use -v to see invocation)


And in case if ifunc call is in another C file:
$ clang -O3 -flto=thin thinlto-ifunc.c ex.c -o out
/tmp/lto-llvm-d8c1fd.o: in function `main':
ex.c:(.text.main+0x2): undefined reference to `foo'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

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