[cmake-developers] [CMake 0015567]: "LOG_CONFIGURE 1" breaks ExternalProject_Add with empty CONFIGURE_COMMAND

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://public.kitware.com/Bug/view.php?id=15567 
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Reported By:                Ruslan Baratov
Assigned To:                
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Project:                    CMake
Issue ID:                   15567
Category:                   CMake
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             2015-05-14 01:47 EDT
Last Modified:              2015-05-14 01:47 EDT
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Summary:                    "LOG_CONFIGURE 1" breaks ExternalProject_Add with
empty CONFIGURE_COMMAND
Description: 
In case when CONFIGURE_COMMAND of ExternalProject_Add is optional and can be
empty setting LOG_CONFIGURE 1 lead to error:
    
    *-configure.cmake:4 (execute_process):
      execute_process given COMMAND argument with no value.

Steps to Reproduce: 
Works fine:

    cmake_minimum_required(VERSION 3.0)
    project(Foo)

    include(ExternalProject)

    set(configure "")

    ExternalProject_Add(
        Foo
        DOWNLOAD_COMMAND ""
        CONFIGURE_COMMAND ${configure}
        COMMAND "${CMAKE_COMMAND}" -E echo ""
        BUILD_COMMAND ""
        INSTALL_COMMAND ""
    )

Not working:

    cmake_minimum_required(VERSION 3.0)
    project(Foo)

    include(ExternalProject)

    set(configure "")

    ExternalProject_Add(
        Foo
        DOWNLOAD_COMMAND ""
        CONFIGURE_COMMAND ${configure}
        COMMAND "${CMAKE_COMMAND}" -E echo ""
        BUILD_COMMAND ""
        INSTALL_COMMAND ""
        LOG_CONFIGURE 1
    )
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Issue History 
Date Modified    Username       Field                    Change               
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2015-05-14 01:47 Ruslan Baratov New Issue                                    
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