为什么bash / echo在此CMake脚本中不起作用？

Question

My CMakeLists.txt correctly builds my_target .

I tried adding this dummy command as a trial post-build step:

 ADD_CUSTOM_COMMAND (
        TARGET my_target POST_BUILD
        COMMAND "echo I made `ls ${MY_DIR} | wc -l` things")

When I run make my_target it fails (after building) with

/bin/sh: 1: echo I made `ls /foo/bar | wc -l` things: not found

If I copy-paste the part from "echo" to "things" into a shell it runs fine

I made 3 things

The "/bin/sh: 1" prefix suggests that a shell is being run with "echo..." as its command, and I tried changing "echo" to "bash echo" so why doesn't this work?

Answer 1

/bin/sh: 1: echo I made `ls /foo/bar | wc -l` things: not found

The error message means that something is trying to execute a command called, literally, with spaces and ticks, echo I made `ls /foo/bar | wc -l` things echo I made `ls /foo/bar | wc -l` things .

So it looks like cmake is passing your whole quote string as the executable. Removing the outer quotes should fix that.