Bug 14112 – Phobos git master doesn't build with MSVC-built compiler (DIP25)

If you build a 64-bit dmd.exe from git master with Visual Studio, Phobos doesn't build any more. I get an error inside unicode_tables.d. Here's a reduced test case: ///////// test.d //////// struct FullCaseEntry { dchar[3] seq; auto value() return { return seq[0..1]; } } ///////////////////////// Compiler output: test.d(5): Error: function declaration without return type. (Note that constructors are always named 'this') test.d(6): Error: no identifier for declarator value()return Miraculously, it's fixed if "return" is replaced with "@return". Sounds like an uninitialized variable?

I tried it and it works with the DMC build DMD. Looks like the VS C++ compiler has a bug in it! Does VS have any valgrind-like feature you can try?

I also ran valgrind on 64 bit dmd compiling test.d on Linux. No memory corruption was detected.

Valdimir can you give more information please? If I build dmd git head with Visual Studio 2013 your test case does not fail. It works both with a debug and release dmd compiled in 64-bit. Which Visual Studio Version are you using? Does it happen both in release and debug?

(In reply to Benjamin Thaut from comment #3) > Valdimir can you give more information please? If I build dmd git head with > Visual Studio 2013 your test case does not fail. It works both with a debug > and release dmd compiled in 64-bit. Which Visual Studio Version are you > using? Does it happen both in release and debug? That's strange. I can reproduce the problem after I build DMD with the "Release" configuration and "x64" platform with either VS2010 or VS2013. Here is the dmd.exe I get, does it happen on your system? http://dump.thecybershadow.net/3b481e0ae99981873edc3c0f5f7f158a/dmd.exe

When you build with vs2013 do you upgrade the solution to the 2013 compiler first? Or do you simply build it using the vs2010 compiler?

I build it with the VS2010 compiler (from the command line). Here are my build commands: set PATH=C:\Soft\dm\bin;%WINDIR%\System32;C:\Soft\Tools set PATH=%PATH%;C:\Windows\Microsoft.NET\Framework64\v4.0.30319 call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64\vcvars64.bat" msbuild /p:Configuration=Release /p:Platform=x64 dmd_msc_vs10.sln if errorlevel 1 exit 1 copy /y vcbuild\x64\Release\dmd_msc.exe dmd.exe copy /y vcbuild\x64\Release\dmd_msc.pdb dmd.pdb

Building with VS2013 works for me, too, but I don't have the VS2010 toolset installed. Your prebuilt binary fails on my system aswell. Does it help to switch the "Platform Toolset" to v120?

Well, actually, the regression doesn't happen for me any more with latest master. I suppose I could bisect it if someone is very curious, but I don't look forward doing it by hand since Digger doesn't build DMD with VS.