Export compile_commands.json in build/ so it's easy to work with several vim plugins.

[byzhang]

No description provided.

[byzhang]

@leifwalsh, it's a simple pull request.

[leifwalsh]

Never seen this before. What does it do?

-- 

Cheers,
Leif

On Mon, Aug 19, 2013 at 1:17 PM, byzhang notifications@github.com wrote:

You can merge this Pull Request by running:
git pull https://github.com/byzhang/ft-index master
Or you can view, comment on it, or merge it online at:
https://github.com/Tokutek/ft-index/pull/52
-- Commit Summary --

• Export compile_commands.json in cmake so it's easy to work with several vim plugins.
  -- File Changes --
  M CMakeLists.txt (2)
  -- Patch Links --
  https://github.com/Tokutek/ft-index/pull/52.patch
  https://github.com/Tokutek/ft-index/pull/52.diff

[byzhang]

When you run cmake .., cmake will generate compile_commands.json which basically lists per-file compiling flags, e.g.

{
"directory": "/home/byzhang/src/ft-index/build/util",
"command": "/usr/bin/c++ -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_SVID_SOURCE -D_XOPEN_SOURCE=600 -D__LONG_LONG_SUPPORTED -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -std=c++11 -Wall -Werror -Wcast-align -Wshadow -Wmissing-format-attribute -Wpointer-arith -Wmissing-declarations -Wno-missing-noreturn -Wextra -Wno-error=strict-overflow -Wpacked -fno-exceptions -fno-rtti -Wno-error=missing-format-attribute -Wmissing-format-attribute -Wlogical-op -Wtrampolines -Wswitch -Winit-self -Wstrict-null-sentinel -Wno-missing-field-initializers -g -O3 -flto -fuse-linker-plugin -O3 -DNDEBUG -UNDEBUG -fPIC -I/home/byzhang/src/ft-index/build/buildheader -I/home/byzhang/src/ft-index/build/./xz/include -I/home/byzhang/src/ft-index/include -I/home/byzhang/src/ft-index/toku_include -I/home/byzhang/src/ft-index/portability -I/home/byzhang/src/ft-index -I/home/byzhang/src/ft-index/build -I/home/byzhang/src/ft-index/build/toku_include -isystem /usr/local/include -o CMakeFiles/util_static.dir/partitioned_counter.cc.o -c /home/byzhang/src/ft-index/util/partitioned_counter.cc",
"file": "/home/byzhang/src/ft-index/util/partitioned_counter.cc"
},

There are several vim plugins can leverage this file for autocompletion or code navigation in C++ (e.g. https://github.com/Valloric/YouCompleteMe)

[byzhang]

And it's also an easy way to know what exactly the compiling flags are used.

[denji]

@byzhang cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON .