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IDProjectCategoryView StatusDate SubmittedLast Update
0011043CMakeCMakepublic2010-07-27 08:062011-04-04 12:00
Reporterovm 
Assigned ToDavid Cole 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionno change required 
PlatformOSOS Version
Product VersionCMake-2-8 
Target VersionFixed in VersionCMake 2.8.4 
Summary0011043: CMake cannot build out-of-source projects with GLOB_RECURSE in CMakeLists.txt
DescriptionMinimal configuration to reproduce:

root/CMakeLists.txt
root/src/main.cpp -- well-known 'Hellow, world' program for example
root/build/ -- an empty dir to build in

CMakeLists.txt contents:

project(main CXX)
cmake_minimum_required(VERSION 2.8)
file(GLOB_RECURSE SRC src *.cpp)
add_executable(main ${SRC})

The issued command:

cmake .. && make

produce an output:

-- The CXX compiler identification is GNU
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/om/0/test/build
Scanning dependencies of target main
[ 50%] Building CXX object CMakeFiles/main.dir/src/main.cpp.o
[100%] Building CXX object CMakeFiles/main.dir/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp.o
/home/om/0/test/build/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp:76: warning: deprecated conversion from string constant to ‘char*’
/home/om/0/test/build/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp:189: warning: deprecated conversion from string constant to ‘char*’
/home/om/0/test/build/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp:190: warning: deprecated conversion from string constant to ‘char*’
Linking CXX executable main
CMakeFiles/main.dir/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp.o: In function `main':
CMakeCXXCompilerId.cpp:(.text+0x0): multiple definition of `main'
CMakeFiles/main.dir/src/main.cpp.o:main.cpp:(.text+0x0): first defined here
collect2: ld returned 1 exit status
make[2]: *** [main] Error 1
make[1]: *** [CMakeFiles/main.dir/all] Error 2
make: *** [all] Error 2


The reason of failure is quite obvious: CMake link it's target with it's internal temporary executable.

At CMakeFiles/main.dir/build.make there is this code:

# Object files for target main
main_OBJECTS = \
"CMakeFiles/main.dir/src/main.cpp.o" \
"CMakeFiles/main.dir/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp.o"

# External object files for target main
main_EXTERNAL_OBJECTS =

main: CMakeFiles/main.dir/src/main.cpp.o
main: CMakeFiles/main.dir/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp.o
main: CMakeFiles/main.dir/build.make
main: CMakeFiles/main.dir/link.txt
    @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --red --bold "Linking CXX executable main"
    $(CMAKE_COMMAND) -E cmake_link_script CMakeFiles/main.dir/link.txt --verbose=$(VERBOSE)

link.txt have those line:

/usr/bin/c++ CMakeFiles/main.dir/src/main.cpp.o CMakeFiles/main.dir/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp.o -o main -rdynamic


I dunno at what point those files are generated and is there any way to prevent this bad rules to be generated, but it's enough to fix this two points to get things worked.

P.S. Yeah-yeah-yeah, I know "You should list all of your 9k source files by hand at CMakeLists.txt" and "You use GLOB? Dieeee!!11"
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  Notes
(0021492)
ovm (reporter)
2010-07-27 10:27
edited on: 2010-07-27 10:44

 One more clue.

file(GLOB_RECURSE SRC src *.cpp)
message("Files to compile: " ${SRC})

produces

Files to compile: /home/om/0/test/src/main.cpp/home/om/0/test/build/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp


Also, I've started to looking another Cmake commands and fall into doubt about using "RELATIVE" clause (should I use it and if yes what kind of syntax element is this?).

If I issue a command in kinda strange form:

file(GLOB_RECURSE SRC RELATIVE src *.cpp)

I'll got absolutely nothing at ${SRC} variable:

CMakeLists.txt contents:

project(main CXX)
file(GLOB_RECURSE SRC RELATIVE src *.cpp)
message("Files to compile: " ${SRC})
add_executable(main ${SRC})

An output is like this:

-- The CXX compiler identification is GNU
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
Files to compile:
CMake Error at CMakeLists.txt:7 (add_executable):
  add_executable called with incorrect number of arguments


-- Configuring incomplete, errors occurred!


Just for report cmake version is 2.8.1
(0024158)
David Cole (manager)
2010-12-15 11:10

 Please use a full path for your file(GLOB calls.

If you are going to use file(GLOB and you want to get all the cpp files in the "src" directory of your source tree, for example, use this:
file(GLOB_RECURSE SRC "${CMAKE_SOURCE_DIR}/*.cpp")

Please add more info if this does not work for you.
(0026064)
David Cole (manager)
2011-04-04 12:00

 Closing resolved issues that have not been updated in more than 3 months.

 Issue History
Date Modified Username Field Change
2010-07-27 08:06 ovm New Issue
2010-07-27 10:27 ovm Note Added: 0021492
2010-07-27 10:44 ovm Note Edited: 0021492
2010-12-15 11:07 David Cole Assigned To => David Cole
2010-12-15 11:07 David Cole Status new => assigned
2010-12-15 11:10 David Cole Note Added: 0024158
2010-12-15 11:10 David Cole Status assigned => resolved
2010-12-15 11:10 David Cole Fixed in Version => CMake 2.8.4
2010-12-15 11:10 David Cole Resolution open => no change required
2011-04-04 12:00 David Cole Note Added: 0026064
2011-04-04 12:00 David Cole Status resolved => closed

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