MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0014935CMakeCMakepublic2014-05-26 04:562016-06-10 14:31
Reporterth.thielemann 
Assigned ToKitware Robot 
PrioritynormalSeverityminorReproducibilityalways
StatusclosedResolutionmoved 
PlatformVmware Player 6.0.2 on Win7OSUbuntuOS Version12.04 LTS
Product Version 
Target VersionFixed in Version 
Summary0014935: file(APPEND "message...") writes nulls into file
DescriptionI am using a shared folder between my Win7 and VmWare with Ubuntu 12.04.
Fore some reasons I write out some properties into a file during cmake run.
First line with file(WRITE "key=value"). All others with file(APPEND ...)
Sucessful tested on Windows, Linux using the local file system. But if I share a folder between Windows and Linux, the result is "00 00 00 00 ... 00 The appended message".
Steps To ReproduceCreate the environment Win7 + VmWare + Ubuntu 12.04 LTS + shared folder.

Here is my function

function(write_env_script Mode EnvKey EnvValue)
    # Possible option flags
    list(FIND ARGN EXTEND IsExtend)

    # Resulting script name
    if(CMAKE_HOST_WIN32)
        file(TO_NATIVE_PATH ${EnvValue} EnvValue)
    endif()
    set(ScriptName ${PROJECT_BINARY_DIR}/setprojectenv${SSP_SCRIPT_TYPE})

    # Reset mode to WRITE if file does not exist
    if(("${Mode}" STREQUAL "APPEND") AND (NOT EXISTS ${ScriptName}))
        set(Mode "WRITE")
    endif()

    # overwrite or extend the env variable's value
    set(EnvValueAlreadySet -1)
    if(NOT IsExtend EQUAL -1)
        if(NOT "$ENV{${EnvKey}}" STREQUAL "")
            if(CMAKE_HOST_UNIX)
                set(CurrentEnvValue "$ENV{${EnvKey}}:")
            elseif(CMAKE_HOST_WIN32)
                set(CurrentEnvValue "$ENV{${EnvKey}};")
            endif()
        endif()
        # Contains the env variable the value already?
        string(FIND "$ENV{${EnvKey}}" "${EnvValue}" EnvValueAlreadySet REVERSE)
    endif()

    if(EnvValueAlreadySet EQUAL -1)
        if(CMAKE_HOST_UNIX)
#### Error! Replace the following line with workaround
                        file(${Mode} ${ScriptName} "${PreviousScriptContent} export ${EnvKey}=${CurrentEnvValue}${EnvValue}\n" )
            execute_process(COMMAND chmod u+x ${ScriptName} WORKING_DIRECTORY "${PROJECT_BINARY_DIR}")
        elseif(CMAKE_HOST_WIN32)
            file(${Mode} ${ScriptName} "set ${EnvKey}=${CurrentEnvValue}${EnvValue}\n\r" )
        endif()
    endif()
endfunction()


The workaround for linux using VmWare share.
            if("${Mode}" STREQUAL "APPEND")
                file(READ ${ScriptName} PreviousScriptContent)
            endif()
            file(WRITE ${ScriptName} "${PreviousScriptContent} export ${EnvKey}=${CurrentEnvValue}${EnvValue}\n" )


Usage of the function:
    write_env_script(APPEND QT_PLUGIN_PATH "${QtLibs_PATH}/plugins")
    write_env_script(APPEND QML2_IMPORT_PATH "${QtLibs_PATH}/qml")
    write_env_script(APPEND PATH "${QtLibs_PATH}/bin" EXTEND)
Additional Information
TagsCMake, linux, shared, Windows 7
Relationships
Attached Files
Issue History
Date ModifiedUsernameFieldChange
2014-05-26 04:56th.thielemannNew Issue
2014-05-26 07:22David ColeNote Added: 0035930
2014-05-26 08:50th.thielemannNote Added: 0035931
2014-05-26 08:53th.thielemannTag Attached: CMake
2014-05-26 08:53th.thielemannTag Attached: linux
2014-05-26 08:53th.thielemannTag Attached: shared
2014-05-26 08:53th.thielemannTag Attached: Windows 7
2016-06-10 14:29Kitware RobotNote Added: 0042552
2016-06-10 14:29Kitware RobotStatusnew => resolved
2016-06-10 14:29Kitware RobotResolutionopen => moved
2016-06-10 14:29Kitware RobotAssigned To => Kitware Robot
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0035930)
David Cole   
2014-05-26 07:22   
Are you certain the null characters are not coming from the value of some environment variable?
(0035931)
th.thielemann   
2014-05-26 08:50   
The values inserted are display on screen without any issues. In the case I use the workaround (Read previous file content into cmake variable, add the new content and write all back) everything is fine.
At first I assumed the reason is the file system only (the shared folder between Win7 and Linux). But I build in the shared folder too and no other file generated by cmake, compiler, linker shows this issue.
(0042552)
Kitware Robot   
2016-06-10 14:29   
Resolving issue as `moved`.

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