Clang-tidy is outputting correctly, but I'm getting no warning symbols in file

## Information

**VIM version**

NVIM v0.3.5
Build type: Release

Operating System:

OSX Sierra 10.12.6

## What went wrong

I'm trying to configure ALE to do C++ warnings/errors in the file.

I am seeing that the clang-tidy command ran as intended in ALEInfo, but I'm not seeing any lines highlighted in vim

## Reproducing the bug

0. Disable all other plugins

1. Set up ALE with clang-tidy and cppcheck

2. Open a cpp file

Expected
- warnings should be displayed in the buffer

Observed
- Warnings are not displayed, although the command was run successfully in ALEInfo and there should be warnings seen
- See screenshot vs output in ALEInfo

### :ALEInfo

Current Filetype: cpp
Available Linters: ['ccls', 'clang', 'clangcheck', 'clangd', 'clangtidy', 'clazy', 'cppcheck', 'cpplint', 'cquery', 'flawfinder', 'gcc']
Linter Aliases:
'gcc' -> ['g++']
Enabled Linters: ['clangcheck', 'clangtidy', 'cppcheck']
Suggested Fixers:
'clang-format' - Fix C/C++ and cuda files with clang-format.
'remove_trailing_lines' - Remove all blank lines at the end of a file.
'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.
'uncrustify' - Fix C, C++, C#, ObjectiveC, ObjectiveC++, D, Java, Pawn, and VALA files with uncrustify.
Linter Variables:

let g:ale_cpp_clangcheck_executable = 'clang-check'
let g:ale_cpp_clangcheck_options = ''
let g:ale_cpp_clangtidy_checks = ['*,-google*']
let g:ale_cpp_clangtidy_executable = 'clang-tidy'
let g:ale_cpp_clangtidy_options = ''
let g:ale_cpp_cppcheck_executable = 'cppcheck'
let g:ale_cpp_cppcheck_options = '--enable=style'
Global Variables:

let g:ale_cache_executable_check_failures = v:null
let g:ale_change_sign_column_color = 0
let g:ale_command_wrapper = ''
let g:ale_completion_delay = v:null
let g:ale_completion_enabled = 0
let g:ale_completion_max_suggestions = v:null
let g:ale_echo_cursor = 1
let g:ale_echo_msg_error_str = 'Error'
let g:ale_echo_msg_format = '%code: %%s'
let g:ale_echo_msg_info_str = 'Info'
let g:ale_echo_msg_warning_str = 'Warning'
let g:ale_enabled = 1
let g:ale_fix_on_save = 1
let g:ale_fixers = {'cpp': ['remove_trailing_lines'], 'json': ['prettier'], 'javascript': ['prettier'], 'css': ['prettier'], 'python': ['remove_trailing_lines', 'trim_whitespace']}
let g:ale_history_enabled = 1
let g:ale_history_log_output = 1
let g:ale_keep_list_window_open = 0
let g:ale_lint_delay = 200
let g:ale_lint_on_enter = 1
let g:ale_lint_on_filetype_changed = 1
let g:ale_lint_on_insert_leave = 1
let g:ale_lint_on_save = 1
let g:ale_lint_on_text_changed = 'never'
let g:ale_linter_aliases = {}
let g:ale_linters = {'hpp': ['clangcheck', 'clangtidy', 'cppcheck'], 'h': ['clangcheck', 'clangtidy', 'cppcheck'], 'py': ['flake8'], 'cpp': ['clangcheck', 'clangtidy', 'cppcheck']}
let g:ale_linters_explicit = 0
let g:ale_list_vertical = 0
let g:ale_list_window_size = 10
let g:ale_loclist_msg_format = '%code: %%s'
let g:ale_lsp_root = {}
let g:ale_max_buffer_history_size = 20
let g:ale_max_signs = -1
let g:ale_maximum_file_size = v:null
let g:ale_open_list = 0
let g:ale_pattern_options = v:null
let g:ale_pattern_options_enabled = v:null
let g:ale_set_balloons = 0
let g:ale_set_highlights = 1
let g:ale_set_loclist = 1
let g:ale_set_quickfix = 0
let g:ale_set_signs = 1
let g:ale_sign_column_always = 0
let g:ale_sign_error = '✖'
let g:ale_sign_info = '⚠'
let g:ale_sign_offset = 1000000
let g:ale_sign_style_error = '✖'
let g:ale_sign_style_warning = '⚠'
let g:ale_sign_warning = '⚠'
let g:ale_statusline_format = [' %d E ', ' %d W ', '']
let g:ale_type_map = {}
let g:ale_use_global_executables = v:null
let g:ale_virtualtext_cursor = 0
let g:ale_warn_about_trailing_blank_lines = 1
let g:ale_warn_about_trailing_whitespace = 1
Command History:

(executable check - failure) clang-check
(executable check - success) clang-tidy
(finished - exit code 0) ['bash', '-c', '''clang-tidy'' -checks=''*,-google*'' ''/Users/cjappl/Documents/Code/cjappl_europa_main/europashell/AudioFifo.cpp'' -p ''/Users/cjappl/Documents/Code/cjappl_europa_main/build''']

<<>>
/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:17:10: error: 'stdarg.h' file not found [clang-diagnostic-error]
#include
^
/Users/cjappl/Documents/Code/cjappl_europa_main/europashell/AudioFifo.h:21:9: warning: function 'AudioFifo::WriteFromBuffer' has a definition with different parameter names [readability-inconsistent-declaration-parameter-name]
int WriteFromBuffer(AudioSampleBuffer& buffer);
^ ~~~~~~~
inputBuffer
/Users/cjappl/Documents/Code/cjappl_europa_main/europashell/AudioFifo.cpp:20:16: note: the definition seen here
int AudioFifo::WriteFromBuffer(AudioSampleBuffer& inputBuffer)
^
/Users/cjappl/Documents/Code/cjappl_europa_main/europashell/AudioFifo.h:21:9: note: differing parameters are named here: ('buffer'), in definition: ('inputBuffer')
int WriteFromBuffer(AudioSampleBuffer& buffer);
^
/Users/cjappl/Documents/Code/cjappl_europa_main/europashell/AudioFifo.h:24:9: warning: function 'AudioFifo::ReadToBuffer' has a definition with different parameter names [readability-inconsistent-declaration-parameter-name]
int ReadToBuffer(AudioSampleBuffer& buffer);
^ ~~~~~~~
outputBuffer
/Users/cjappl/Documents/Code/cjappl_europa_main/europashell/AudioFifo.cpp:72:16: note: the definition seen here
int AudioFifo::ReadToBuffer(AudioSampleBuffer& outputBuffer)
^
/Users/cjappl/Documents/Code/cjappl_europa_main/europashell/AudioFifo.h:24:9: note: differing parameters are named here: ('buffer'), in definition: ('outputBuffer')
int ReadToBuffer(AudioSampleBuffer& buffer);
^
<<>>

(executable check - success) cppcheck
(finished - exit code 0) ['bash', '-c', '''cppcheck'' -q --language=c++ --enable=style ''/var/folders/n0/0fkj29b90q3_nlv8jkrxprr8m01t_4/T/nvimXyO5Yj/2/AudioFifo.cpp''']

<<>>