[CMake] Bash on ubuntu on windows as target

[Tiago Macarios]

Hi All,

Windows 10 anniversary edition comes with support to execute Linux
binaries. I have been trying to use it with one of our projects, but I have
been getting a weird error. Maybe someone can help me?

The target is pretty simple:

set(BASH "C:\\Windows\\System32\\bash.exe")
set(ARGS "--help")
add_custom_target(linux ${BASH} ${ARGS})

If I then build that project in visual studio (with some extra verbosity) I
get:

Target "CustomBuild" in file "C:\Program Files
(x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.CppCommon.targets" from
project "C:\_Working\delegate\build\linux.vcxproj" (target
"_BuildGenerateSourcesAction" depends on it):
Using "CustomBuild" task from assembly "C:\Program Files
(x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.Build.CppTasks.Common.dll".
Task "CustomBuild"
  Write Tracking Logs:
  x64\Debug\linux\linux.tlog\custombuild.write.1.tlog
  Read Tracking Logs:
  x64\Debug\linux\linux.tlog\custombuild.read.1.tlog
  No output for
C:\_WORKING\DELEGATE\BUILD\CMAKEFILES\3FA5525E877A7559336C7D412E1B43B0\LINUX.RULE|C:\_WORKING\DELEGATE\CMAKELISTS.TXT
was found in the tracking log; source compilation required.
  C:\_Working\delegate\CMakeLists.txt will be compiled as it was not found
in the tracking log.

C:\_Working\delegate\build\CMakeFiles\3fa5525e877a7559336c7d412e1b43b0\linux.rule
will be compiled as it was not found in the tracking log.
  setlocal
  "C:\Program Files (x86)\CMake\bin\cmake.exe" -HC:/_Working/delegate
-BC:/_Working/delegate/build --check-stamp-file
C:\_Working\delegate\build\CMakeFiles\generate.stamp
  if %errorlevel% neq 0 goto :cmEnd
  :cmEnd
  endlocal & call :cmErrorLevel %errorlevel% & goto :cmDone
  :cmErrorLevel
  exit /b %1
  :cmDone
  if %errorlevel% neq 0 goto :VCEnd
  setlocal
  C:\Windows\System32\bash.exe --help
  if %errorlevel% neq 0 goto :cmEnd
  :cmEnd
  endlocal & call :cmErrorLevel %errorlevel% & goto :cmDone
  :cmErrorLevel
  exit /b %1
  :cmDone
  if %errorlevel% neq 0 goto :VCEnd
  Building Custom Rule C:/_Working/delegate/CMakeLists.txt
  CMake does not need to re-run because
C:\_Working\delegate\build\CMakeFiles\generate.stamp is up-to-date.
C:\Program Files
(x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.CppCommon.targets(171,5):
error MSB6006: "cmd.exe" exited with code -1073740791.
Done executing task "CustomBuild" -- FAILED.
Done building target "CustomBuild" in project "linux.vcxproj" -- FAILED.


The command line seems correct. If I just copy it to the windows prompt it
works fine:

C:\Users\tmc>  C:\Windows\System32\bash.exe --help
GNU bash, version 4.3.11(1)-release-(x86_64-pc-linux-gnu)
Usage:  /bin/bash [GNU long option] [option] ...
        /bin/bash [GNU long option] [option] script-file ...
GNU long options:
        --debug
        --debugger
        --dump-po-strings
        --dump-strings
        --help
        --init-file
        --login
        --noediting
        --noprofile
        --norc
        --posix
        --rcfile
        --restricted
        --verbose
        --version
Shell options:
        -ilrsD or -c command or -O shopt_option         (invocation only)
        -abefhkmnptuvxBCHP or -o option
Type `/bin/bash -c "help set"' for more information about shell options.
Type `/bin/bash -c help' for more information about shell builtin commands.
Use the `bashbug' command to report bugs.


I also tried to use it from the visual studio "external tools" and it seems
to work. So I am not sure what is going on. Is there a way to debug
custom_targets?

In case anyone tries the example above on a 64 bit machine: You will need
to copy bash.exe from system32 to syswow64 since VS is 32 bits.

Tiago
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