Fix cmake build without automake

[1whatleytay]

I want to use this as a library by including it via cmake as a git submodule! I can't right now because of how fswatch configures stuff with cmake :(

I wrote something here as to why a cmake build system would be helpful. I'd appeciate any feedback!

[tomas321]

@1whatleytay great PR!. It's sad that this PR is not being considered (yet). Even though I applied your changes to my newly created fork and encounter a problem:

/snap/clion/137/bin/cmake/linux/bin/cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_COMPILER=/usr/bin/g++ -G "CodeBlocks - Unix Makefiles" /home/tomas/dev/fswatch
-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc - works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/g++
-- Check for working CXX compiler: /usr/bin/g++ - works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for include file sys/inotify.h
-- Looking for include file sys/inotify.h - found
-- Looking for include file sys/event.h
-- Looking for include file sys/event.h - not found
-- Looking for include file port.h
-- Looking for include file port.h - not found
-- Configuring done
-- Generating done
-- Build files have been written to: /home/tomas/dev/fswatch/cmake-build-debug

Cannot get compiler information:
    Compiler exited with error code 1: /usr/bin/g++ -xc++ -D-HAVE_STRUCT_STAT_ST_MTIMESPEC -I/home/tomas/dev/fswatch/libfswatch/.. -I/home/tomas/dev/fswatch/libfswatch/src/libfswatch -I/home/tomas/dev/fswatch/libfswatch/src -g -std=gnu++11 -fpch-preprocess -v -dD -E
    Using built-in specs.
    COLLECT_GCC=/usr/bin/g++
    OFFLOAD_TARGET_NAMES=nvptx-none
    OFFLOAD_TARGET_DEFAULT=1
    Target: x86_64-linux-gnu
    Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.5.0-3ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
    Thread model: posix
    gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04) 
    COLLECT_GCC_OPTIONS='-D' '-HAVE_STRUCT_STAT_ST_MTIMESPEC' '-I' '/home/tomas/dev/fswatch/libfswatch/..' '-I' '/home/tomas/dev/fswatch/libfswatch/src/libfswatch' '-I' '/home/tomas/dev/fswatch/libfswatch/src' '-g' '-std=gnu++11' '-fpch-preprocess' '-v' '-dD' '-E' '-D' '___CIDR_DEFINITIONS_END' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
     /usr/lib/gcc/x86_64-linux-gnu/7/cc1plus -E -quiet -v -I /home/tomas/dev/fswatch/libfswatch/.. -I /home/tomas/dev/fswatch/libfswatch/src/libfswatch -I /home/tomas/dev/fswatch/libfswatch/src -imultiarch x86_64-linux-gnu -D_GNU_SOURCE -D -HAVE_STRUCT_STAT_ST_MTIMESPEC -D ___CIDR_DEFINITIONS_END /tmp/compiler-file13017098905077137266 -mtune=generic -march=x86-64 -std=gnu++11 -fpch-preprocess -g -fworking-directory -fstack-protector-strong -Wformat -Wformat-security -dD
    ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/7"
    ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
    ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/7/../../../../x86_64-linux-gnu/include"
    #include "..." search starts here:
    #include <...> search starts here:
     /home/tomas/dev/fswatch/libfswatch/..
     /home/tomas/dev/fswatch/libfswatch/src/libfswatch
     /home/tomas/dev/fswatch/libfswatch/src
     /usr/include/c++/7
     /usr/include/x86_64-linux-gnu/c++/7
     /usr/include/c++/7/backward
     /usr/lib/gcc/x86_64-linux-gnu/7/include
     /usr/local/include
     /usr/lib/gcc/x86_64-linux-gnu/7/include-fixed
     /usr/include/x86_64-linux-gnu
     /usr/include
    End of search list.
    <command-line>:0:1: error: macro names must be identifiers

[Failed to reload]

The errors weren't saying much, but after some time I found the typo in one of the files - problematic line.

There is a missing D int the option. So it should be like this - -DHAVE_STRUCT_STAT_ST_MTIMESPEC

In addition, #258 includes a crucial cmake typo. I suggest you include it to your changes to minimize the number of PRs.

After that I noticed the missing compile option when HAVE_SYS_INOTIFY_H is set to TRUE - missing code segment in libfswatch/CMakeLists.txt:

set(LIB_COMPILE_DEFINITIONS
            ${LIB_COMPILE_DEFINITIONS}
            -DHAVE_SYS_INOTIFY_H)

Hope it gets merged!

[emcrisostomo]

Hi @1whatleytay, I'd really like to get this merged. Unfortunately, I'm not maintaining the CMake build system. I lack the expertise, and I've decided to move the CMake stuff on a separate branch, in case somebody with the required expertise can have a look at it. It seems you've done a great job here. If you're feeling like having a look at this, feel free, and I'll gladly integrate the CMake support back into master.