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Subject: [Bug c++/58060] New: separate compilation of gnu multiversioning gives undefined/multiple defined symbols at link time
Date: Fri, 02 Aug 2013 14:52:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58060

            Bug ID: 58060
           Summary: separate compilation of gnu multiversioning gives
                    undefined/multiple defined symbols at link time
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mib.bugzilla at gmail dot com

Created attachment 30592
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30592&action=edit
test case part 1

I tried gnu multiversioning with separate compilation but I get both these
messages at link time: multiple defined symbols and undefined symbol. 

g++ -o foo.exe mv6c-1.o mv6c.o
mv6c.o: In function `foo()':
mv6c.C:(.text+0x0): multiple definition of `foo()'
mv6c-1.o:mv6c-1.C:(.text+0x0): first defined here
mv6c-1.o: In function `_Z3foov.resolver':
mv6c-1.C:(.text._Z3foov.resolver[_Z3foov.resolver]+0x1b): undefined reference
to `_Z3foov.arch_corei7'
collect2: error: ld returned 1 exit status
-bash-4.1$ cp mv6c*C ~/my_home
-bash-4.1$ cat mv6c.C
  /* corei7 version of foo.  */
  __attribute__ ((target("arch=corei7")))
  int foo () { return 7; }
// I thought this compilation unit would create a function with the name
arch_corei7, but it just creates a foo without target decoration