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Re: trouble with ovl.h


From: Carnë Draug
Subject: Re: trouble with ovl.h
Date: Sat, 9 Jul 2016 14:09:12 +0100

On 9 July 2016 at 01:49, Ben Abbott <address@hidden> wrote:
> Carne,
>
> I’m seeing an error that looks to be triggered by your recent change below.
>
> http://hg.savannah.gnu.org/hgweb/octave/rev/55c20a3e3e59
>
>  
> "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"
>  -cc1 -triple x86_64-apple-macosx10.11.0 -Wdeprecated-objc-isa-usage 
> -Werror=deprecated-objc-isa-usage -emit-obj -disable-free 
> -disable-llvm-verifier -main-file-name octave.cc -mrelocation-model pic 
> -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-verbose 
> -munwind-tables -target-cpu core2 -target-linker-version 264.3.102 -v 
> -dwarf-column-info -coverage-file 
> /Users/bpabbott/Development/mercurial/default/build/octave.cc -resource-dir 
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/7.3.0
>  -dependency-file libinterp/.deps/libinterp_liboctinterp_la-octave.Tpo 
> -sys-header-deps -MP -MT libinterp/libinterp_liboctinterp_la-octave.lo -D 
> HAVE_CONFIG_H -I . -I ../sources -I liboctave -I ../sources/liboctave -I 
> ../sources/liboctave/cruft/misc -I ../sources/liboctave/array -I 
> liboctave/numeric -I ../sources/liboctave/numeric -I liboctave/operators -I 
> ../sources/liboctave/operators -I ../sources/liboctave/system -I 
> ../sources/liboctave/util -I ../sources/libinterp/octave-value -I libinterp 
> -I ../sources/libinterp -I ../sources/libinterp/operators -I 
> libinterp/parse-tree -I ../sources/libinterp/parse-tree -I libinterp/corefcn 
> -I ../sources/libinterp/corefcn -I ../sources/liboctave/wrappers -I 
> /sw/include/GraphicsMagick -I /sw/include/mesa -I /sw/include -D _THREAD_SAFE 
> -D _THREAD_SAFE -stdlib=libc++ -O3 -Wall -W -Wshadow -Wold-style-cast 
> -Wformat -Wpointer-arith -Wwrite-strings -Wcast-align -Wcast-qual 
> -std=gnu++11 -fdeprecated-macro -fdebug-compilation-dir 
> /Users/bpabbott/Development/mercurial/default/build -ferror-limit 19 
> -fmessage-length 188 -pthread -stack-protector 1 -fblocks 
> -fobjc-runtime=macosx-10.11.0 -fencode-extended-block-signature 
> -fcxx-exceptions -fexceptions -fmax-type-align=16 -fdiagnostics-show-option 
> -fcolor-diagnostics -vectorize-loops -vectorize-slp -o octave.o -x c++ 
> ../sources/libinterp/octave.cc
> clang -cc1 version 7.3.0 (clang-703.0.31) default target 
> x86_64-apple-darwin15.5.0
> ignoring nonexistent directory "/sw/include/mesa"
> ignoring nonexistent directory "/usr/include/c++/v1"
> ignoring nonexistent directory "/usr/local/include"
> #include "..." search starts here:
> #include <...> search starts here:
>  .
>  ../sources
>  liboctave
>  ../sources/liboctave
>  ../sources/liboctave/cruft/misc
>  ../sources/liboctave/array
>  liboctave/numeric
>  ../sources/liboctave/numeric
>  liboctave/operators
>  ../sources/liboctave/operators
>  ../sources/liboctave/system
>  ../sources/liboctave/util
>  ../sources/libinterp/octave-value
>  libinterp
>  ../sources/libinterp
>  ../sources/libinterp/operators
>  libinterp/parse-tree
>  ../sources/libinterp/parse-tree
>  libinterp/corefcn
>  ../sources/libinterp/corefcn
>  ../sources/liboctave/wrappers
>  /sw/include/GraphicsMagick
>  /sw/include
>  
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1
>  
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/7.3.0/include
>  
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
>  /usr/include
>  /System/Library/Frameworks (framework directory)
>  /Library/Frameworks (framework directory)
> End of search list.
> In file included from ../sources/libinterp/octave.cc:48:
> In file included from ../sources/libinterp/build-env.h:28:
> In file included from ../sources/libinterp/corefcn/oct-map.h:33:
> ../sources/libinterp/octave-value/ovl.h:195:10: error: ambiguous conversion 
> for functional-style cast from 'void' to 'octave_value_list'
>   return octave_value_list ({args...});
>          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ../sources/libinterp/octave.cc:1128:10: note: in instantiation of function 
> template specialization 'ovl<std::__1::basic_string<char> >' requested here
>   return ovl (octave_program_invocation_name);
>          ^
> ../sources/libinterp/octave-value/ovl.h:60:3: note: candidate constructor
>   octave_value_list (const std::initializer_list<octave_value>& args)
>   ^
> ../sources/libinterp/octave-value/ovl.h:54:3: note: candidate constructor
>   octave_value_list (const octave_value& tc)
>   ^
> ../sources/libinterp/octave-value/ovl.h:68:3: note: candidate constructor
>   octave_value_list (const Cell& tc)
>   ^
> ../sources/libinterp/octave-value/ovl.h:71:3: note: candidate constructor
>   octave_value_list (const octave_value_list& obj)
>   ^
> 1 error generated.
>
> Ben

I don't see that error with gcc 4.9.2. Does this change fix the issue for you?
If so I will push it.

--- a/libinterp/octave-value/ovl.h    Sun Jul 03 09:54:43 2016 -0700
+++ b/libinterp/octave-value/ovl.h    Sat Jul 09 14:07:04 2016 +0100
@@ -192,7 +192,7 @@ template<typename... OV_Args>
 inline octave_value_list
 ovl (const OV_Args&... args)
 {
-  return octave_value_list ({args...});
+  return octave_value_list (std::initializer_list<octave_value> ({args...}));
 }



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