[CMake] How to set environment variables with spaces in commands

[Attila Krasznahorkay]

Hi QP,

Probably not the intended solution, but what I’m doing in such cases is that in a patch step I create a shell script that does the configuration for me. With all the environment settings and everything. Like:

PATCH_COMMAND ${CMAKE_COMMAND} -E echo “cd someDir/; CC=\”something\” ./configure” > configure.sh
CONFIGURE_COMMAND sh configure.sh

Unfortunately this makes the code quite unportable, as it will only work on POSIX platforms like this. But I guess that’s the case anyway once you start setting environment variables.

Cheers,
           Attila

P.S. I often create build.sh and install.sh scripts as well in additional patch commands.

> On Dec 10, 2015, at 5:35 AM, Qingping Hou <dave2008713 at gmail.com> wrote:
> 
> Hi all,
> 
> I am trying to setup an ExternalProject in cmake but got stuck in the
> configuration step. I am using ccache to speed up the compilation:
> 
> ```
> ExternalProject_Add(
>  ...
>  CONFIGURE_COMMAND CC="ccache arm-linux-gnueabihf-gcc" ./configure
>  ...
> )
> ```
> 
> However, when cmake generates the Makefile, it moves the quotes around
> and breaks the command:
> 
> ```
> "CC=ccache arm-linux-gnueabihf-gcc" ./configure
> ```
> 
> I have tried various escaping method to try to get it work properly
> without any luck. Is this a bug or an unintended feature?
> 
> Thanks,
> QP
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