MSVC Debug Build

[Calvin L]

Hi,

I was wondering if anyone had any luck with the MSVC debug build so far? I successfully built v8 as a static library for release builds with these commands

    

    gn gen out.gn/x64_release --args="is_component_build=false is_debug=false target_cpu=\"x64\" v8_enable_pointer_compression=false is_clang=false"

    call ninja -C out.gn/x64_release

   gn gen out.gn/x86_release --args="is_component_build=false is_debug=false target_cpu=\"x86\" v8_enable_pointer_compression=false is_clang=false"

   call ninja -C out.gn/x86_release

These compile fine with my project. I haven't been able to get the debug build to work on the other hand. Here's some of the args i tried to build with

args: is_component_build=false 

         is_debug=true 

         target_cpu="x64" 

         v8_enable_pointer_compression=false 

         is_clang=false

result: successful build failed linking

args: is_component_build=false 

         is_debug=true 

         symbol_level=2 

         target_cpu="x64" 

         v8_enable_backtrace=true 

         v8_enable_slow_dchecks=true 

         v8_enable_pointer_compression=false 

         is_clang=false"

result: successful build failed linking

args: is_component_build=false

         is_debug=true symbol_level=2 

         target_cpu="x64" 

         v8_enable_backtrace=true 

         v8_enable_slow_dchecks=true 

         v8_optimized_debug=false 

         v8_enable_pointer_compression=false 

         is_clang=false

result: failed build (attached errors in text file)

args: is_component_build=false

         is_debug=true 

         symbol_level=2 

         target_cpu="x64" 

         v8_enable_backtrace=true 

         v8_enable_slow_dchecks=true 

         v8_optimized_debug=false 

         v8_enable_pointer_compression=false 

         is_clang=false

         enable_iterator_debugging=true

result: successful build failed link

In the cases where the build was successful, I received errors while trying to compile with my project

    "mismatch detected for '_ITERATOR_DEBUG_LEVEL':value '0' doesn't match value '2' in {some other .lib in my project}"

    "mismatch detected for "RuntimeLibrary": value 'MT_StaticRelease' doesn't match value 'MTd_StaticDebug in {some other .lib in my project}'

does anyone know why this is? Thanks in advanced!

-CL

[J Decker]

https://github.com/nodejs/node/issues/27189  

+          '_ITERATOR_DEBUG_LEVEL=0',

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[Ron Prestenback]

I was able to get the msvc debug config to build using static libs last week (in UnrealJS).  Maybe this will help you.

When you set "is_debug=true", v8 will define _DEBUG and change which args are passed to cl.exe.  It sounds like the other libs you're trying to link with are maybe using the release CRT even in debug builds (UE4 does this, for example).  If that's the case, you'll need to change a couple of things in v8's configuration to make it match the host environment:

- in build\config\win\BUILD.gn on the next line after "# Desktop Windows: static CRT.", change config from :static_crt to :release_crt

- in build\config\BUILD.gn file, remove the _DEBUG define from the "debug" configuration section

- Not sure if this will apply to your version of v8, but I had to fix some compile errors with CSA_ASSERT_ARGS macro.  If that happens, see https://github.com/v8/v8/commit/695c40f08ea

I used the following args when running gn:

v8_use_external_startup_data=false

v8_use_snapshot=false

v8_enable_i18n_support=false

is_debug=true

v8_static_library=true

is_clang=false

is_component_build=false

Hope this helps!