manual, help text: updates of --enable text. updates of 'Preprocessor configurations' section, the --force and --max-configs can be used together with -D.
This commit is contained in:
Daniel Marjamäki
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616a693f1f
commit
c65437c74c
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@ -743,8 +743,10 @@ void CmdLineParser::PrintHelp()
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" by providing an implementation for them.\n"
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" --check-config Check cppcheck configuration. The normal code\n"
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" analysis is disabled by this flag.\n"
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" -D<ID> By default Cppcheck checks all configurations. Use -D\n"
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" to limit the checking to a particular configuration.\n"
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" -D<ID> By default Cppcheck checks all configurations. When -D\n"
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" is used, Cppcheck only checks the given configuration.\n"
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" But you can also use --force or --max-configs to check\n"
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" multiple configurations.\n"
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" Example: '-DDEBUG=1 -D__cplusplus'.\n"
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" -U<ID> By default Cppcheck checks all configurations. Use -U\n"
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" to explicitly hide certain #ifdef <ID> code paths from\n"
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@ -753,6 +755,8 @@ void CmdLineParser::PrintHelp()
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" --enable=<id> Enable additional checks. The available ids are:\n"
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" * all\n"
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" Enable all checks\n"
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" * warning\n"
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" Enable warning messages"
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" * style\n"
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" Enable all coding style checks. All messages\n"
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" with the severities 'style', 'performance' and\n"
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@ -104,9 +104,10 @@ Checking path/file2.cpp...
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<para>All files under <filename class="directory">src/a</filename> and
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<filename class="directory">src/b</filename> are then checked.</para>
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<para>The second option is to use <parameter class="command">-i</parameter>,
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with it you specify files/paths to ignore. With this command no files in
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<filename class="directory">src/c</filename> are checked:</para>
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<para>The second option is to use <parameter
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class="command">-i</parameter>, with it you specify files/paths to
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ignore. With this command no files in <filename
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class="directory">src/c</filename> are checked:</para>
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<programlisting>cppcheck -isrc/c src</programlisting>
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</section>
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@ -147,9 +148,10 @@ Checking path/file2.cpp...
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<term>performance</term>
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<listitem>
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<para>Suggestions for making the code faster. These suggestions are
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only based on common knowledge. It is not certain you'll get any
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measurable difference in speed by fixing these messages.</para>
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<para>Suggestions for making the code faster. These suggestions
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are only based on common knowledge. It is not certain you'll get
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any measurable difference in speed by fixing these
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messages.</para>
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</listitem>
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</varlistentry>
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@ -175,67 +177,42 @@ Checking path/file2.cpp...
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<section>
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<title>Enable messages</title>
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<para>By default only <parameter class="command">error</parameter> messages
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are shown. Through the <parameter class="command">--enable</parameter>
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command more checks can be enabled.</para>
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<para>By default only <parameter class="command">error</parameter>
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messages are shown. Through the <parameter
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class="command">--enable</parameter> command more checks can be
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enabled.</para>
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<section>
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<title>Stylistic issues</title>
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<programlisting># enable warning messages
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cppcheck --enable=warning file.c
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<para>With <parameter class="command">--enable=style</parameter> you
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enable most <parameter class="command">warning</parameter>,
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<parameter class="command">style</parameter> and
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<parameter class="command">performance</parameter> messages.</para>
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# enable performance messages
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cppcheck --enable=performance file.c
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<para>Here is a simple code example:</para>
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# enable information messages
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cppcheck --enable=information file.c
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<programlisting>void f(int x)
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{
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int i;
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if (x == 0)
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{
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i = 0;
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}
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}</programlisting>
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# For historical reasons, --enable=style enables warning, performance,
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# portability and style messages. These are all reported as "style" when
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# using the old xml format.
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cppcheck --enable=style file.c
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<para>There are no bugs in that code so Cppcheck won't report anything
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by default. To enable the stylistic messages, use the
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<parameter class="command">--enable=style</parameter> command:</para>
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# enable warning and information messages
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cppcheck --enable=warning,information file.c
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<programlisting>cppcheck --enable=style file3.c</programlisting>
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# enable unusedFunction checking. This is not enabled by --enable=style
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# because it doesn't work well on libraries.
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cppcheck --enable=unusedFunction file.c
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<para>The output from Cppcheck is now:</para>
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<programlisting>Checking file3.c...
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[file3.c:3]: (style) Variable 'i' is assigned a value that is never used
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[file3.c:3]: (style) The scope of the variable i can be reduced</programlisting>
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</section>
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<section>
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<title>Unused functions</title>
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<para>This check will try to find unused functions. It is best to use
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this when the whole program is checked, so that all usages is seen by
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cppcheck.</para>
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<programlisting>cppcheck --enable=unusedFunction path</programlisting>
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</section>
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<section>
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<title>Enable all checks</title>
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<para>To enable all checks your can use the
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<parameter class="command">--enable=all</parameter> flag:</para>
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<programlisting>cppcheck --enable=all path</programlisting>
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</section>
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# enable all messages
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cppcheck --enable=all</programlisting>
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<section>
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<title>Inconclusive checks</title>
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<para>By default Cppcheck only writes error messages if it is certain.
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With <parameter class="command">--inconclusive</parameter> error
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messages will also be written when the analysis is inconclusive.</para>
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messages will also be written when the analysis is
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inconclusive.</para>
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<programlisting>cppcheck --inconclusive path</programlisting>
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@ -258,8 +235,9 @@ Checking path/file2.cpp...
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<section>
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<title>Multithreaded checking</title>
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<para>The option -j is used to specify the number of threads you want to use.
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For example, to use 4 threads to check the files in a folder:</para>
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<para>The option -j is used to specify the number of threads you want to
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use. For example, to use 4 threads to check the files in a
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folder:</para>
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<programlisting>cppcheck -j 4 path</programlisting>
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</section>
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@ -269,22 +247,30 @@ Checking path/file2.cpp...
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<title>Preprocessor configurations</title>
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<para>By default Cppcheck will check all preprocessor configurations
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(except those that have #error in them). This is the recommended
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behaviour.</para>
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(except those that have #error in them).</para>
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<para>But if you want to manually limit the checking you can do so with
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<parameter class="command">-D</parameter>.</para>
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<para>You can use -D to change this. When you use -D, cppcheck will by
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default only check the given configuration and nothing else. This is how
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compilers work. But you can use <literal>--force</literal> or
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<literal><literal>--max-configs</literal></literal> to override the number
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of configurations.</para>
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<para>Beware that only the macros, which are given here and the macros
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defined in source files and known header files are considered. That
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excludes all the macros defined in some system header files, which are by
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default not examined by Cppcheck.</para>
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<programlisting># check all configurations
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cppcheck file.c
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<para>The usage: if you, for example, want to limit the checking so the
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only configuration to check should be <literal>DEBUG=1;__cplusplus</literal>
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then something like this can be used:</para>
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# only check the configuration A
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cppcheck -DA file.c
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<programlisting>cppcheck -DDEBUG=1 -D__cplusplus path</programlisting>
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# check all configurations when macro A is defined
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cppcheck -DA --force file.c</programlisting>
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<para>Another useful flag might be -U. It undefines a symbol. Example
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usage:</para>
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<programlisting>cppcheck -UX file.c</programlisting>
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<para>That will mean that X is not defined. Cppcheck will not check what
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happens when X is defined.</para>
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</chapter>
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<chapter>
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@ -416,8 +402,8 @@ Checking path/file2.cpp...
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<para>If you want to reformat the output so it looks different you can use
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templates.</para>
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<para>To get Visual Studio compatible output you can use
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<parameter class="command">--template=vs</parameter>:</para>
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<para>To get Visual Studio compatible output you can use <parameter
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class="command">--template=vs</parameter>:</para>
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<programlisting>cppcheck --template=vs gui/test.cpp</programlisting>
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@ -427,8 +413,8 @@ Checking path/file2.cpp...
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gui/test.cpp(31): error: Memory leak: b
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gui/test.cpp(16): error: Mismatching allocation and deallocation: k</programlisting>
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<para>To get gcc compatible output you can use
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<parameter class="command">--template=gcc</parameter>:</para>
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<para>To get gcc compatible output you can use <parameter
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class="command">--template=gcc</parameter>:</para>
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<programlisting>cppcheck --template=gcc gui/test.cpp</programlisting>
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@ -449,7 +435,8 @@ gui/test.cpp:16: error: Mismatching allocation and deallocation: k</programlisti
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gui/test.cpp,31,error,memleak,Memory leak: b
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gui/test.cpp,16,error,mismatchAllocDealloc,Mismatching allocation and deallocation: k</programlisting>
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<para>The escape sequences \b (backspace), \n (newline), \r (formfeed) and \t (horizontal tab) are supported.</para>
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<para>The escape sequences \b (backspace), \n (newline), \r (formfeed) and
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\t (horizontal tab) are supported.</para>
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</chapter>
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<chapter>
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@ -558,9 +545,8 @@ Checking test.c...
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<section>
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<title>User-defined allocation/deallocation functions</title>
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<para>Cppcheck understands standard allocation and
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deallocation functions. But it doesn't know what library functions
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do.</para>
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<para>Cppcheck understands standard allocation and deallocation
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functions. But it doesn't know what library functions do.</para>
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<para>Here is example code that might leak memory or resources:</para>
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@ -591,8 +577,8 @@ void DestroyFred(void *p)
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}</programlisting>
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<para>When Cppcheck see this it understands that <function>CreateFred()
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</function> will return allocated memory and that <function>DestroyFred()
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</function> will deallocate memory.</para>
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</function> will return allocated memory and that
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<function>DestroyFred() </function> will deallocate memory.</para>
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<para>Now, execute <command>cppcheck</command> this way:</para>
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@ -609,11 +595,11 @@ void DestroyFred(void *p)
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<title>HTML report</title>
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<para>You can convert the XML output from cppcheck into a HTML report.
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You'll need Python and the pygments module
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(<ulink url="http://pygments.org/">http://pygments.org/</ulink>) for this to
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work. In the Cppcheck source tree there is a folder
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<filename class="directory">htmlreport</filename> that contains a script
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that transforms a Cppcheck XML file into HTML output.</para>
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You'll need Python and the pygments module (<ulink
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url="http://pygments.org/">http://pygments.org/</ulink>) for this to work.
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In the Cppcheck source tree there is a folder <filename
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class="directory">htmlreport</filename> that contains a script that
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transforms a Cppcheck XML file into HTML output.</para>
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<para>This command generates the help screen:</para>
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@ -675,8 +661,10 @@ htmlreport/cppcheck-htmlreport --file=err.xml --report-dir=test1 --source-dir=.<
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<para>The language can be changed at any time by using the
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<guimenu>Language</guimenu> menu.</para>
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<para>More settings are available in
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<menuchoice><guimenu>Edit</guimenu><guimenuitem>Preferences</guimenuitem>
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<para>More settings are available in <menuchoice>
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<guimenu>Edit</guimenu>
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<guimenuitem>Preferences</guimenuitem>
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</menuchoice>.</para>
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</section>
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@ -696,9 +684,10 @@ htmlreport/cppcheck-htmlreport --file=err.xml --report-dir=test1 --source-dir=.<
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</listitem>
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</itemizedlist>
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<para>As you can read in <link linkend="preprocessor-configurations">chapter
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3</link> in this manual the default is that Cppcheck checks all configurations.
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So only provide preprocessor defines if you want to limit the checking.</para>
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<para>As you can read in <link
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linkend="preprocessor-configurations">chapter 3</link> in this manual
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the default is that Cppcheck checks all configurations. So only provide
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preprocessor defines if you want to limit the checking.</para>
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</section>
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</chapter>
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</book>
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