[cmake-developers] output expressions fails with either a build.ninja error or wrong escaped space

[jerry . c . t]

Hi,

i am trying the example of the Output Expressions from here:

 

https://cmake.org/cmake/help/v3.5/manual/cmake-generator-expressions.7.html

 

But i have problems getting it working. It either fails with

 

ninja: error: build.ninja:83: bad $-escape (literal $ must be written as $$)
  COMMAND = cd /tmp/bug/build && /usr/bin/c++ -E -P -MMD -I$<JOIN:$ -I> ...
                                                           ^ near here

if i omit the start and end quote of the -I$<JOIN... statement or it fails to build my example because of the escaped space in -I/tmp\ -I

 

[1/1] cd /tmp/bug/build && /usr/bin/c++ -E -P -MMD -I/tmp\ -I/tmp/bug/build dummy.cpp -o dummy.i
FAILED: cd /tmp/bug/build && /usr/bin/c++ -E -P -MMD -I/tmp\ -I/tmp/bug/build dummy.cpp -o dummy.i
dummy.cpp:1:19: fatal error: dummy.h: No such file or directory

 

Removing the backslash in build.ninja with escaped version it works. I attached a reproducer. I tried it with linux. Run it in a build directory with

cmake -GNinja <path_to_cmakefile>
ninja custom

 

What am i doing wrong or is it a bug?

 Jerry

 

## reproducer ##

cmake_minimum_required(VERSION 3.2)

add_library(dummy dummy.cpp)
target_include_directories(dummy PUBLIC /tmp)
target_include_directories(dummy PUBLIC ${CMAKE_BINARY_DIR})

add_custom_target(custom
  ${CMAKE_CXX_COMPILER} -E -P -MMD
  "-I$<JOIN:$<TARGET_PROPERTY:dummy,INCLUDE_DIRECTORIES>, -I>"
  dummy.cpp -o dummy.i
)
FILE(WRITE ${CMAKE_BINARY_DIR}/dummy.cpp "#include <dummy.h>\nint main(void){return 0;}\n")
FILE(WRITE ${CMAKE_BINARY_DIR}/dummy.h "void foo() {}\n")

 

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