[cmake-developers] Possibly an obscure bug

[Binkie Pinkie]

Hi,
TL;DR: The project compiles fine first time, but after touching a source
file to trigger a recompile, the recompilation fails with a large list of
errors.

To reproduce this must be done:

1) Have set(CMAKE_INCLUDE_CURRENT_DIR ON)
2) call your executable "list"
3) #include <list> anywhere in your project or include a system/library
header that #includes <list>

My own example, folder names have nothing to do with the bug:
[-] Blink
    CMakeLists.txt
    [-]blink
        main.cpp
        CMakeLists.txt

Top CMakeLists.txt content:

cmake_minimum_required(VERSION 2.8.12)

Project(Blink)

add_subdirectory(blink)


The other CMakeLists.txt file:

set(CMAKE_INCLUDE_CURRENT_DIR ON)
add_executable(list main.cpp)


main.cpp:

#include <cstdio>

#include <list>


int main(int argc, char *argv[])

{

    printf("Hello, world\n");

    return 0;

}


The project will compile, but if main.cpp gets touched the
recompilation will fail.


Using Ubuntu 16.04, cmake version 3.5.1, any compiler (gcc/clang)


And here's the sample output of a failed compilation (the first umpteen lines):


build$ make
Scanning dependencies of target list
make[2]: Circular blink/CMakeFiles/list.dir/main.cpp.o <- blink/list
dependency dropped.
[ 50%] Building CXX object blink/CMakeFiles/list.dir/main.cpp.o
In file included from /media/data/docs/dev/Blink/blink/main.cpp:2:0:
/media/data/docs/dev/Blink/build/blink/list:1:1: error: stray ‘\177’ in program
 ELF              >     � @     @       �           @ 8   @            @
 ^
/media/data/docs/dev/Blink/build/blink/list:1:1: error: stray ‘\2’ in program
/media/data/docs/dev/Blink/build/blink/list:1:1: error: stray ‘\1’ in program
/media/data/docs/dev/Blink/build/blink/list:1:1: error: stray ‘\1’ in program
/media/data/docs/dev/Blink/build/blink/list:1:8: warning: null
character(s) ignored
 ELF              >     � @     @       �           @ 8   @            @
        ^


Plus lots and lots of lines, and ends with:



/media/data/docs/dev/Blink/build/blink/list:1:2: error: ‘ELF’ does not
name a type

 ELF              >     � @     @       �           @ 8   @            @
  ^
/media/data/docs/dev/Blink/build/blink/list:1:651: error: ‘N’ does not
name a type
 x-x86-64.so.2             GNU                             GNU  �נ.;N�)��S�  cQ
                                                                     ^
blink/CMakeFiles/list.dir/build.make:62: recipe for target
'blink/CMakeFiles/list.dir/main.cpp.o' failed
make[2]: *** [blink/CMakeFiles/list.dir/main.cpp.o] Error 1
CMakeFiles/Makefile2:85: recipe for target
'blink/CMakeFiles/list.dir/all' failed
make[1]: *** [blink/CMakeFiles/list.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
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