[CMake] ExternalProject_Add with flexible install commands

[Petr Kmoch]

Hi Kent,

I believe it's not "empty quotes" that disables the install command, it's
the empty string. So you should not escape the quotes:

#######################
# Default behavior is to NOT install library, empty quotes should disable
install
set( libxxx_inst_comm INSTALL_COMMAND "" )

# Build the library as an external project
  ExternalProject_Add( libxxx
    SOURCE_DIR ${PROJECT_SOURCE_DIR}/src
    ${libxxx_inst_comm}
  )
#######################

Petr


On Thu, Feb 25, 2016 at 7:04 AM, Knox, Kent <Kent.Knox at amd.com> wrote:

> I am having a problem passing parameters as a variable into
> ExternalProject_Add(). I seem to be fighting syntax, i've tried many
> different variants with the set() statement
>
>
> #######################
>
> # Default behavior is to NOT install library, empty quotes should disable
> install
> set( libxxx_inst_comm INSTALL_COMMAND "\"\"" )
>
> # Build the library as an external project
>   ExternalProject_Add( libxxx
>     SOURCE_DIR ${PROJECT_SOURCE_DIR}/src
>     ${libxxx_inst_comm}
>   )
> #######################
>
> I get this message, which appears to be within ExternalProject_add()
> using add_custom_command.  Is there a way around this?
>
> CMake Error at
> /opt/homebrew-cask/Caskroom/cmake/3.2.2/CMake.app/Contents/share/cmake-3.2/Modules/ExternalProject.cmake:1487
> (add_custom_command):
>
>   COMMAND may not contain literal quotes:
>
>
>     ""
>
>
> --
>
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