为什么从make文件中查找命令失败

Question

I am working on modifying a windows make file. The file, which is part of legacy build code has the following lines --

    WROOT := "MyBuild/win/Program Files/Windows Kits/10" 


   ROOT_SDK_Version := $(shell find $(WROOT_WIN10_SDK)/Include -maxdepth 1 -type d -path $(WROOT_WIN10_SDK)/Include/[0-9.]* )

The SHELL variable is mapped to bin/sh but when I print the variable ROOT_SDK_Version, it is empty. However, when I manually invoke the find command with the same arguments, it is giving the expected out.

To debug this issue, I modified above line in make file as below

ROOT_SDK_Version := $(shell find $(WROOT_WIN10_SDK)/Include -maxdepth 1 -type d -path $(WROOT_WIN10_SDK)/Include/[0-9.]* 2> output.txt )

And I see the contents of the file output.txt after running make -

find: paths must precede expression
Usage: find [-H] [-L] [-P] [path...] [expression]

So why is the find command failing when running from make file but is successful when I run it manually using the same arguments? Any pointers appreciated.

Providing more context-

WROOT_WIN10_SDK := "$(GOBUILD_CAYMAN_MSVC_DESKTOP_ROOT)/win/Program Files/Windows Kits/10"

The variable GOBUID...is== E:/Myscpetre20/depot/sim/sim-20fq1/build/gobuild/compcache/cayman_msvc_desktop/ob-11144741/windows2016-clean

So WROOT_WIN10_SDK is == "E:/Myscpetre20/depot/sim/sim-20fq1/build/gobuild/compcache/cayman_msvc_desktop/ob-11144741/windows2016-clean/win/Program Files/Windows Kits/10"

Answer 1

I think the argument to the -path option needs to be quoted -- otherwise the glob * will be expanded by the shell rather than being passed to find . So...

   ROOT_SDK_Version := $(shell find $(WROOT_WIN10_SDK)/Include -maxdepth 1 -type d -path '$(WROOT_WIN10_SDK)/Include/[0-9.]*' )