[LLVMbugs] [Bug 12925] New: always_inline attribute isn't honored when optimizing for code size

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed May 23 09:32:42 PDT 2012


             Bug #: 12925
           Summary: always_inline attribute isn't honored when optimizing
                    for code size
           Product: new-bugs
           Version: trunk
          Platform: Sun
        OS/Version: Solaris
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sbn at tbricks.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


When building my application on Solaris using clang and libc++ I got linker
error about unresolved symbol which is marked as always_inline.
I was able to minimize it to the following:

$ cat a.cpp
extern unsigned strlen(const char *);

template<class _CharT>
class basic_string
    __attribute__ ((__always_inline__))
    basic_string(_CharT const* __s);

    void __init(_CharT const* __s, unsigned __sz);

typedef basic_string<char> string;

template <class _CharT>
__attribute__ ((__always_inline__)) inline
basic_string<_CharT>::basic_string(_CharT const* __s)
    __init(__s, strlen(__s));

extern template class basic_string<char>;

struct S
    virtual char const* get_info() const;

struct P
    S* m_s;

    virtual S& get_s() const { return *m_s; }

struct I
    virtual string get_info() const = 0;

struct PI : P, I
    virtual string get_info() const
        return this->get_s().get_info();

PI pi;
$ /opt/clang/bin/clang++ -Os -c a.cpp && nm a.o|g UNDEF | gc++filt | grep
[47]    |         0|         0|NOTY |GLOB |0    |UNDEF 
|basic_string<char>::__init(char const*, unsigned int)
[48]    |         0|         0|NOTY |GLOB |0    |UNDEF 
|basic_string<char>::basic_string(char const*)
$ /opt/clang/bin/clang++ -v
clang version 3.1 (branches/release_31)
Target: i386-pc-solaris2.10
Thread model: posix

As one can see even though basic_string<char> constructor from const char* is
marked as always_inline it nevertheless is undefined.

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