[clang-doc] Add test for functions with builtin return types (#120318)

This is a precommit test for #120308, since we lack non-template
functions that use builtin types.

clang-tools-extra/test/clang-doc/builtin_types.cpp

@@ -0,0 +1,136 @@
+// RUN: rm -rf %t
+// RUN: mkdir -p %t/yaml %t/md
+
+// RUN: clang-doc --doxygen --executor=standalone %s -output=%t/yaml
+// RUN: FileCheck %s < %t/yaml/index.yaml --check-prefix=YAML
+
+// RUN: clang-doc --doxygen --executor=standalone %s -output=%t/md --format=md
+// RUN: FileCheck %s < %t/md/GlobalNamespace/index.md  --check-prefix=MD
+
+//      YAML: ---
+// YAML-NEXT: USR:             '0000000000000000000000000000000000000000'
+// YAML-NEXT: ChildFunctions:
+
+// MD: # Global Namespace
+// MD: ## Functions
+
+extern bool b();
+
+// YAML-NEXT:   - USR:             '88A104C263241E354ECF5B55B04AE8CEAD625B71'
+// YAML-NEXT:     Name:            'b'
+// YAML-NEXT:     Location:
+// YAML-NEXT:       - LineNumber:      [[# @LINE-5]]
+// YAML-NEXT:         Filename:        '{{.*}}'
+// YAML-NEXT:     ReturnType:
+// YAML-NEXT:       Type:
+// YAML-NEXT:         Name:            '_Bool'
+// YAML-NEXT:         QualName:        '_Bool'
+
+// MD: ### b
+// MD: *_Bool b()*
+
+char c();
+
+// YAML-NEXT:   - USR:             'EA3287837B3F175C8DB154406B4DAD2924F479B5'
+// YAML-NEXT:     Name:            'c'
+// YAML-NEXT:     Location:
+// YAML-NEXT:       - LineNumber:      [[# @LINE-5]]
+// YAML-NEXT:         Filename:        '{{.*}}'
+// YAML-NEXT:     ReturnType:
+// YAML-NEXT:       Type:
+// YAML-NEXT:         Name:            'char'
+// YAML-NEXT:         QualName:        'char'
+
+// MD: ### c
+// MD: *char c()*
+
+double d();
+
+// YAML-NEXT:   - USR:             '60A47E4696CEFC411AB2E1EEFA2DD914E2A7E450'
+// YAML-NEXT:     Name:            'd'
+// YAML-NEXT:     Location:
+// YAML-NEXT:       - LineNumber:      [[# @LINE-5]]
+// YAML-NEXT:         Filename:        '{{.*}}'
+// YAML-NEXT:     ReturnType:
+// YAML-NEXT:       Type:
+// YAML-NEXT:         Name:            'double'
+// YAML-NEXT:         QualName:        'double'
+
+// MD: ### d
+// MD: *double d()*
+
+float f();
+
+// YAML-NEXT:   - USR:             'B3A9EC6BECD5869CF3ACDFB25153CFE6BBDD5EAB'
+// YAML-NEXT:     Name:            'f'
+// YAML-NEXT:     Location:
+// YAML-NEXT:       - LineNumber:      [[# @LINE-5]]
+// YAML-NEXT:         Filename:        '{{.*}}'
+// YAML-NEXT:     ReturnType:
+// YAML-NEXT:       Type:
+// YAML-NEXT:         Name:            'float'
+// YAML-NEXT:         QualName:        'float'
+
+// MD: ### f
+// MD: *float f()*
+
+int i();
+
+// YAML-NEXT:   - USR:             '307041280A81EB46F949A94AD52587C659FD801C'
+// YAML-NEXT:     Name:            'i'
+// YAML-NEXT:     Location:
+// YAML-NEXT:       - LineNumber:      [[# @LINE-5]]
+// YAML-NEXT:         Filename:        '{{.*}}'
+// YAML-NEXT:     ReturnType:
+// YAML-NEXT:       Type:
+// YAML-NEXT:         Name:            'int'
+// YAML-NEXT:         QualName:        'int'
+
+// MD: ### i
+// MD: *int i()*
+
+long l();
+
+// YAML-NEXT:   - USR:             'A1CE9AB0064C412F857592E01332C641C1A06F37'
+// YAML-NEXT:     Name:            'l'
+// YAML-NEXT:     Location:
+// YAML-NEXT:       - LineNumber:      [[# @LINE-5]]
+// YAML-NEXT:         Filename:        '{{.*}}'
+// YAML-NEXT:     ReturnType:
+// YAML-NEXT:       Type:
+// YAML-NEXT:         Name:            'long'
+// YAML-NEXT:         QualName:        'long'
+
+// MD: ### l
+// MD: *long l()*
+
+long long ll();
+
+// YAML-NEXT:   - USR:             '5C2C44ED4825C066EF6ED796863586F343C8BCA9'
+// YAML-NEXT:     Name:            'll'
+// YAML-NEXT:     Location:
+// YAML-NEXT:       - LineNumber:      [[# @LINE-5]]
+// YAML-NEXT:         Filename:        '{{.*}}'
+// YAML-NEXT:     ReturnType:
+// YAML-NEXT:       Type:
+// YAML-NEXT:         Name:            'long long'
+// YAML-NEXT:         QualName:        'long long'
+
+// MD: ### ll
+// MD: *long long ll()*
+
+short s();
+
+// YAML-NEXT:   - USR:             '412341570FD3AD2C3A1E9A1DE7B3C01C07BEACFE'
+// YAML-NEXT:     Name:            's'
+// YAML-NEXT:     Location:
+// YAML-NEXT:       - LineNumber:      [[# @LINE-5]]
+// YAML-NEXT:         Filename:        '{{.*}}'
+// YAML-NEXT:     ReturnType:
+// YAML-NEXT:       Type:
+// YAML-NEXT:         Name:            'short'
+// YAML-NEXT:         QualName:        'short'
+// YAML-NEXT: ...
+
+// MD: ### s
+// MD: *short s()*