1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Creator documentation.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
**
****************************************************************************/
// **********************************************************************
// NOTE: the sections are not ordered by their logical order to avoid
// reshuffling the file each time the index order changes (i.e., often).
// Run the fixnavi.pl script to adjust the links to the index order.
// **********************************************************************
/*!
\contentspage index.html
\previouspage creator-diff-editor.html
\page creator-clang-codemodel.html
\nextpage creator-finding-overview.html
\title Parsing C++ Files with the Clang Code Model
The \e {code model} is the part of an IDE that understands the language you
are using to write your application. It is the framework that allows \QC
to provide the following services:
\list
\li \l{Completing Code}{Code completion}
\li Syntactic and \l{Semantic Highlighting}{semantic highlighting}
\li Navigating in the code by using the \l{Searching with the Locator}
{locator}, \l{Moving to Symbol Definition or Declaration}
{following symbols}, and so on
\li Inspecting code by using the \l{Browsing Project Contents}
{class browser}, the \l{Viewing Defined Types and Symbols}
{outline}, and so on
\li Diagnostics
\li \l{Viewing Function Tooltips}{Tooltips}
\li \l{Finding Symbols}{Finding and renaming symbols}
\li \l{Applying Refactoring Actions}{Refactoring actions}
\endlist
\QC comes with a plugin that provides some of these services
for C++ on top of \l{http://clang.llvm.org/}{Clang}.
\section1 About the Clang Code Model
The Clang project provides libraries for parsing
C language family source files. The feedback you get through warning and
error markers is the same as a compiler will give you, not an incomplete
set or a close approximation, as when using the built-in \QC code model.
Clang focuses on detailed information for diagnostics, which is really
useful if the code contains typos, for example.
Clang keeps up with the development of the C++ language. At the time of this
writing, it supports C++98/03, C++11, C++14, C++17, C89, C99, Objective-C,
and Objective-C++.
On the downside, for large projects using Clang as code model is slower than
using the built-in code model. Clang does not need to generate object files,
but it still needs to parse and analyze the source files. For small projects
that only use STL, this is relatively fast. But for larger projects that
include several files, processing a single file and all the included files
can take a while.
The Clang code model plugin now provides some of the services that were
previously provided by the built-in C/C++ code model. Currently, the
following services are implemented:
\list
\li Code completion
\li Syntactic and semantic highlighting
\li \l{Using Clang Tools}{Diagnostics}
\li Outline of symbols
\li Tooltips
\li Renaming of local symbols
\endlist
To use the built-in code model instead, select \uicontrol Help >
\uicontrol {About Plugins} > \uicontrol C++, and deselect the
\uicontrol ClangCodeModel check box. Select \uicontrol {Restart Now}
to restart \QC and have the changes take effect.
You can configure Clang diagnostics either globally or separately for:
\list
\li Clang code model (globally or at project level)
\li \l{Using Clang Tools}{Clang tools} (globally or at project level)
\endlist
\section1 Configuring Clang Code Model
To configure the Clang code model globally:
\list 1
\li Select \uicontrol Tools > \uicontrol Options > \uicontrol C++ >
\uicontrol {Code Model}.
\image qtcreator-clang-code-model-options.png
\li To instruct the code model to interpret ambiguous header files as C
language files if you develop mainly using C, select the
\uicontrol {Interpret ambiguous headers as C headers} check box.
\li To process precompiled headers, deselect the
\uicontrol {Ignore precompiled headers} check box.
\li To avoid out-of-memory crashes caused by indexing huge source files
that are typically auto-generated by scripts or code, the size of
files to index is limited to 5MB by default. To adjust the limit,
edit the value for the \uicontrol {Do not index files greater than}
check box. To index all files, deselect the check box.
\li Select \uicontrol Manage to specify the Clang checks to perform.
\image qtcreator-diagnostics-configuration.png
\endlist
\section1 Clang Checks
The predefined configurations perform the following Clang checks:
\list
\li \uicontrol {Clang-only pedantic checks} uses the \c -Wpendantic
option that performs checks as required by strict ISO C and ISO C++.
\li \uicontrol {Clang-only checks for questionable constructs} combines
the \c -Wall and \c -Wextra checks for easily avoidable questionable
constructions and some additional issues.
\li \uicontrol {Clang-only checks for almost everything} uses the
\c -Weverything option with negative options to suppress some
warnings.
\endlist
You can edit the predefined configurations to perform particular checks
beginning with \c -W. Each of these checks also has a negative version
that begins with \c -Wno.
Keep in mind that some options turn on other options. For more information,
see \l{https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html}
{Options to Request or Suppress Warnings} or the GCC or Clang manual pages.
\section1 Specifying Clang Code Model Settings at Project Level
You can specify Clang code model settings at project level by selecting
\uicontrol Projects > \uicontrol {Clang Code Model}.
In addition to configuring the diagnostics,
you can select the \uicontrol {Enable MSVC-compliant template parsing} check
box to parse templates in a MSVC-compliant way. This enables Clang to parse
headers for example from Active Template Library (ATL) or Windows Runtime
Library (WRL). However, using the relaxed and extended rules means that no
highlighting or completion can be provided within template functions.
\image qtcreator-clang-code-model-build-settings.png
\include creator-compilation-database.qdocinc using compilation databases
*/
|
