5 files changed, 31 insertions, 4 deletions
diff --git a/ale_linters/c/clangd.vim b/ale_linters/c/clangd.vim
index 0bb38d43..ab8a0259 100644
--- a/ale_linters/c/clangd.vim
+++ b/ale_linters/c/clangd.vim
@@ -3,9 +3,14 @@
 
 call ale#Set('c_clangd_executable', 'clangd')
 call ale#Set('c_clangd_options', '')
+call ale#Set('c_build_dir', '')
 
 function! ale_linters#c#clangd#GetCommand(buffer) abort
-    return '%e -x c' . ale#Pad(ale#Var(a:buffer, 'c_clangd_options'))
+    let l:build_dir = ale#c#GetBuildDirectory(a:buffer)
+
+    return '%e -x c'
+    \    . ale#Pad(ale#Var(a:buffer, 'c_clangd_options'))
+    \    . (!empty(l:build_dir) ? ' -compile-commands-dir=' . ale#Escape(l:build_dir) : '')
 endfunction
 
 call ale#linter#Define('c', {
diff --git a/ale_linters/cpp/clangd.vim b/ale_linters/cpp/clangd.vim
index fab605f4..14f3fe55 100644
--- a/ale_linters/cpp/clangd.vim
+++ b/ale_linters/cpp/clangd.vim
@@ -3,9 +3,14 @@
 
 call ale#Set('cpp_clangd_executable', 'clangd')
 call ale#Set('cpp_clangd_options', '')
+call ale#Set('c_build_dir', '')
 
 function! ale_linters#cpp#clangd#GetCommand(buffer) abort
-    return '%e' . ale#Pad(ale#Var(a:buffer, 'cpp_clangd_options'))
+    let l:build_dir = ale#c#GetBuildDirectory(a:buffer)
+
+    return '%e'
+    \    . ale#Pad(ale#Var(a:buffer, 'cpp_clangd_options'))
+    \    . (!empty(l:build_dir) ? ' -compile-commands-dir=' . ale#Escape(l:build_dir) : '')
 endfunction
 
 call ale#linter#Define('cpp', {
diff --git a/test/command_callback/clangd_paths/compile_commands.json b/test/command_callback/clangd_paths/with_build_dir/unusual_build_dir_name/compile_commands.json
index e69de29b..e69de29b 100644
--- a/test/command_callback/clangd_paths/compile_commands.json
+++ b/test/command_callback/clangd_paths/with_build_dir/unusual_build_dir_name/compile_commands.json
diff --git a/test/command_callback/clangd_paths/with_compile_commands/compile_commands.json b/test/command_callback/clangd_paths/with_compile_commands/compile_commands.json
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/command_callback/clangd_paths/with_compile_commands/compile_commands.json
diff --git a/test/command_callback/test_c_clangd_command_callbacks.vader b/test/command_callback/test_c_clangd_command_callbacks.vader
index 15726163..555122f6 100644
--- a/test/command_callback/test_c_clangd_command_callbacks.vader
+++ b/test/command_callback/test_c_clangd_command_callbacks.vader
@@ -4,6 +4,11 @@ Before:
   Save &filetype
   let &filetype = 'c'
 
+  Save b:ale_c_clangd_options
+  Save b:ale_c_build_dir
+  Save b:ale_c_build_dir_names
+  Save b:ale_c_parse_compile_commands
+
   let b:command_tail = ' -x c'
 
 After:
@@ -22,9 +27,9 @@ Execute(The project root should be detected correctly):
 
   AssertLSPProject ''
 
-  call ale#test#SetFilename('clangd_paths/dummy.c')
+  call ale#test#SetFilename('clangd_paths/with_compile_commands/dummy.c')
 
-  AssertLSPProject ale#path#Simplify(g:dir . '/clangd_paths')
+  AssertLSPProject ale#path#Simplify(g:dir . '/clangd_paths/with_compile_commands')
 
 Execute(The executable should be configurable):
   let g:ale_c_clangd_executable = 'foobar'
@@ -36,3 +41,15 @@ Execute(The options should be configurable):
 
   AssertLinter 'clangd', ale#Escape('clangd') . b:command_tail . ' ' . b:ale_c_clangd_options
 
+Execute(The compile command database should be detected correctly):
+  call ale#test#SetFilename('clangd_paths/with_build_dir/dummy_src/dummy.c')
+
+  let b:ale_c_clangd_options = ''
+  let b:ale_c_build_dir = ''
+  let b:ale_c_build_dir_names = ['unusual_build_dir_name']
+  let b:ale_c_parse_compile_commands = 1
+
+  AssertLinter 'clangd', ale#Escape('clangd') . b:command_tail
+  \  . ' -compile-commands-dir='
+  \  . ale#Escape(ale#path#Simplify(g:dir . '/clangd_paths/with_build_dir/unusual_build_dir_name'))
+