[cfe-users] How to emit optimization reports

[Nick Lewycky]

On 21 November 2014 04:32, Björn Pollex <bjoern.pollex at sbgenomics.com>
wrote:

> Hi all,
>
> according to the documentation, clang supports options to emit
> optimisation reports
> <http://llvm.org/releases/3.5.0/tools/clang/docs/UsersManual.html#options-to-emit-optimization-reports>.
> However, when I try to use them, I get an error:
>
> $ clang test.cpp -c -Rpass=inline
> clang: error: unknown argument: '-Rpass=inline’
>
>
It looks like your version of clang is too old for the remark flags.

Also, you didn't pass any optimization flags so the inliner won't fire
(except __attribute__((always_inline)) maybe?). You probably wanted to add
-O2 too.

$ clang -c -Rpass=inline hello.cpp -O2
In file included from hello.cpp:1:
In file included from
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/iostream:39:
In file included from
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/ostream:38:
In file included from
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/ios:44:
*/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/basic_ios.h:152:21:
remark: _ZNKSt9basic_iosIcSt11char_traitsIcEE7rdstateEv inlined into*
*      _ZNSt9basic_iosIcSt11char_traitsIcEE8setstateESt12_Ios_Iostate
[-Rpass=inline]*
      { this->clear(this->rdstate() | __state); }
*                    ^*
*/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/basic_ios.h:152:21:
remark: _ZStorSt12_Ios_IostateS_ inlined into*
*      _ZNSt9basic_iosIcSt11char_traitsIcEE8setstateESt12_Ios_Iostate
[-Rpass=inline]*
In file included from hello.cpp:1:
In file included from
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/iostream:39:
*/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/ostream:533:2:
remark: _ZNSt9basic_iosIcSt11char_traitsIcEE8setstateESt12_Ios_Iostate
inlined into*
*      _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
[-Rpass=inline]*
        __out.setstate(ios_base::badbit);
*        ^*
*/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/ostream:536:29:
remark: _ZNSt11char_traitsIcE6lengthEPKc inlined into
_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc*
*      [-Rpass=inline]*
                         static_cast<streamsize>(_Traits::length(__s)));
*                                                 ^*
*hello.cpp:4:3: remark:
_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc inlined into main
[-Rpass=inline]*
  std::cout << "Hello world!\n";
*  ^*
*remark: *__cxx_global_var_init inlined into _GLOBAL__sub_I_hello.cpp
[-Rpass=inline]
*note: *could not determine the original source location for
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/ios_base.h:0:0

$ clang -v
clang version 3.6.0 (trunk 222301)
Target: x86_64-unknown-linux-gnu
Thread model: posix

Am I doing something wrong? I am using this version of clang:
>
> $ clang --version
> Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
> Target: x86_64-apple-darwin14.0.0
> Thread model: posix
>
>
This isn't an llvm.org release, you'd have to contact Apple for support. It
looks like an XCode version to me.

Nick

Thanks for your help, and kind regards,
>
> Björn Pollex
>
>
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>
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