Gcc pragma disable warning. However I still get the warning and unable to find out why.

Gcc pragma disable warning. Nov 2, 2019 · Is there a general rule about disabling warnings in your code? In my particular case, an unreachable code warning was issued because of an if statement testing a constant value, where it could be replaced with a compilation directive. #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wunused" int unususedVariable = 1; #pragma clang diagnostic pop If you are using GCC, use #pragma gcc #pragma GCC diagnostic push #pragma GCC diagnostic warning "-fpermissive" #include <third-party-file. GCC allows the user to selectively enable or disable certain types of diagnostics, and change the kind of the diagnostic. You can silence the warning using #pragma. 9 Diagnostic Pragmas. void foo (int x) // No longer getting "unused parameter 'x Here's how you can do it: Disable a warning for a single line: #pragma GCC diagnostic push. 6. #pragma warning( disable : 4723 ) // C4723: potential divide by 0 // Code which would generate warning 4723. Nov 14, 2022 · Pragmas Accepted by GCC#. Disable warnings for a block of code: #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-W<your-warning-1>" #pragma GCC diagnostic ignored "-W<your-warning-2>" // Code that triggers the warnings #pragma GCC diagnostic pop Jul 10, 2014 · I need to disable a warning that originates inside the macro '__LOG_W' in following code. Any changes that you made to the warning state between push and pop are undone. Share. Dec 19, 2020 · Additional C and C++ build notes (ex: w/gcc or clang compilers): Use -Wwarning-name to turn ON build warning "warning-name", and -Wno-warning-name to turn OFF build warning "warning-name". Mar 17, 2011 · The accepted answer has two big problems that requires more than a comment. Any pointers appreciated. #pragma GCC diagnostic ignored "-W<your-warning>". For example, if you want to suppress the "unused variable" warning Aug 30, 2019 · #pragma GCC diagnostic push. If the \\code with ThatWarning here has a (3rd party) header in it, and that header has a #pragma warning( disable: AnotherWarning) then the pop turns off the disable. For that, I will use the following sample project. There are clang and gcc specific methods for disabling the warnings. 1. Thank you! I have wondered for a couple years when I will need the _Pragma() style over the #pragma style, and I just found it! You might want to add this to your answer: you must use the _Pragma() style if you want to put these calls inside of a macro definition! Mar 23, 2017 · Recent versions of Clang implement the __has_warning feature-check macro. I can find nothing about narrowing in This is useful for turning off specific warnings in a section of source code. I tell this to Clang by passing -Wno-#pragma-messages. To do that, I wrapped this macro inside another macro 'LOG_W' and disabled the warning '-Wold-style-cast' with in that. The warning you get is more a coding style warning (maybe you forgot a field!) than a bug warning. This warning is enabled by default. A given tool only takes into account pragma Warnings that do not specify a tool name, or that specify the matching tool name. 57. Using the GNU Compiler Collection (GCC) 6. 8. You can classify them to be Jun 1, 2012 · GCC and clang let you compile with -w to disable all warnings, but I can't see a #pragma equivalent of it. Oct 28, 2003 · does anyone know, how to disable warnings for &#111;nly some lines of code ? something like MSVC''s "#pragma warning (disable: )" ?? i have &#111;ne code-line with a warning, which is included in almost all other files of my project so the compiler hurls out hundreds of warning messages at co Also, keep in mind that #pragma message is silently ignored by PGI (it will not even generate a warning about the pragma being unknown). Aug 17, 2015 · But passing -Wall and -Wextra in diagnostic ignored pragma in GCC does not work like clang, and does not disable all the possible warnings. I need this because I have code that I want to compile with high warning levels but which necessarily compiles third party code which generates arbitrary warnings. Clang supports GCC’s pragma for compatibility with existing source code, so #pragma GCC diagnostic and #pragma clang diagnostic are synonyms for Clang. This would mean reasoning about the headers files. 3w次，点赞6次，收藏9次。在使用一些第三方库或源码的时候,经常会遇到编译时产生warnings情况,这些warning不是我们自己的代码产生的，当然也不好去修改，但每次编译都显示一大堆与自己代码无关的警告也着实看着不爽，而且还有可能造成自己代码中产生的警告被淹没在多过的无关 A given tool only takes into account pragma Warnings that do not specify a tool name, or that specify the matching tool name. 6 and higher. Aug 13, 2014 · I came up with a possible annoying problem to the first approach. I can't change the code (it is not my) and the GCC version too. Causes GCC to remember the state of the diagnostics as of each push, and restore to that point at each pop. S. Mar 9, 2019 · This is a long-standing missing feature in the GCC C++ front end: C++ preprocessor ignores #pragma GCC diagnostic ; Warnings generated by preprocessing cannot be controlled using programs in g++. This makes it possible to disable warnings selectively for each tool, and as a consequence to detect useless pragma Warnings with switch -gnatw. 1 and get warnings like: warning: expected [error|warning|ignored] after '#pragma GCC diagnostic' The reason is "#pragma GCC diagnostic push", which doesn't exist for GCC before version 4. . The bad news: You can't use any commandline option. The pop instruction is this: #pragma GCC diagnostic pop And to disable a warning, you indicate it this way: #pragma GCC diagnostic ignored "-Wunused-parameter" Putting this together, to suppress the warning in our example code we write: Aug 30, 2019 · #define PIPES_DISABLE_WARNING_PUSH #pragma(GCC diagnostic push) But using DISABLE_WARNING_PUSH then fails to compile: error: expected unqualified-id DISABLE_WARNING_PUSH ^ note: expanded from macro 'DISABLE_WARNING_PUSH' #define DISABLE_WARNING_PUSH #pragma(GCC diagnostic push) Feb 8, 2009 · I've started a new project and have decided to make sure it builds cleanly with the /Wall option enabled. Feb 19, 2017 · gcc 4. I can see only pragma support for disabling individual files. I can find nothing about narrowing in May 1, 2015 · A better GCC solution: use #pragma. gcc needs something like clang's -Wno-pragma-once-outside-header option. However, if the -Wno- form is used, the behavior is slightly different: no diagnostic is produced for -Wno-unknown-warning unless other diagnostics are being produced. cpp files. How to disable it? I am using GCC 5. First, it deactivates the warning for the whole file. 警告を無視したい内容を #pragma warning で指定する。 #pragma push と pop で囲めば、その範囲のみで抑制することができます。 I use -Wall and updating to new gcc I have got a lot of warning: narrowing conversion. #pragma GCC diagnostic ignored "-Wunused-parameter". Thanks for your help. I do appreciate that this warning is actually useful but there are corner cases where this warning must be disabled. w. Note that even though it says “GCC”, it also works for clang. When an unrecognized warning option is requested (e. It just clutters the output. Oct 19, 2019 · gcc's internal API has a diagnostic_inhibit_note() function which turns any "note:" messages off, but that is only serviceable via the unexpected -fcompare-debug-second command line switch, defined here. Note that in general we do not recommend the use of pragmas; See Declaring Attributes of Functions, for further explanation. h. Improve this answer. 58. The [-Wpedantic] at the end of the diagnostic tells you that -Wno-pedantic is the narrowest option that will disable the diagnostic, and that's no use to you if you want to preserve all other pedantic diagnostics. The best example I can think of is a braces warning for mbstate_t state = { 0 }; which encourages people to use memset(&state, 0, sizeof state); instead. Jul 31, 2010 · 159. GCC approaches this by classifying the warning types. Clang also supports #pragma GCC warning (as well as #pragma clang ), but as of 6. Jan 18, 2018 · Some gcc warnings flag things that are best-practices as warnings and encourage you to write broken, non-portable code in their place. I believe that code where you have 100% of control over should never require #pragma warning disable XXXX. I know I can suppress individual warnings with: #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wwarning-name-here" #pragma GCC diagnostic ignored "-Wanother-warning-name-here" // my code goes here #pragma GCC diagnostic pop but I want to suppress all of the warnings Jan 24, 2023 · The pragma warning( pop ) pops the last warning state pushed onto the stack. Instead of putting it on top of the file (or even a header file), just wrap the code in question with #pragma warning (push), #pragma warning (disable) and a matching #pragma warning (pop), as shown here. Consider this example: #pragma warning( push ) #pragma warning( disable : 4705 ) #pragma warning( disable : 4706 ) #pragma warning( disable : 4707 ) // Some code #pragma warning( pop ) Sep 2, 2023 · warning: unknown option after '#pragma GCC diagnostic' kind [-Wpragmas] If I use the pragma the original way in my sample code above, I don’t get this “unknown option” warning. #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-pedantic" std::string colorize_forground(std::string const& message, int const& background) { return std::string("\e[38;5;" + std::to_string(background) + "m" + message + "\x1b[0m"); } #pragma GCC diagnostic pop Warnings may be set to ignored, warning, error, or fatal. : Mar 24, 2017 · // Disable a warning for a block of code: #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wmissing-prototypes" // Some code where the specified warning should be suppressed #pragma GCC diagnostic pop Recent versions of GCC (I am not actually sure since when, but 4. Nov 27, 2017 · Using _Pragma to suppress the warning; Using #pragma to suppress the warning; Using command line options to suppress the warning; 2 Sample Project. #pragma warning( push ) // Save the current warning state. Replace <your-warning> with the specific warning you want to disable. Warnings are useful and if it is indeed a false positive, one should disable the warning for a bunch of code as small as possible. , -Wunknown-warning), GCC emits a diagnostic stating that the option is not recognized. x should support it) show the corresponding -Wsomething Using the GNU Compiler Collection (GCC) 6. Since Clang emulates GCC (not vice-versa) with only one pool of warning flags, it's reasonable to code against GCC using feature-check introspection: Mar 11, 2024 · I however just want to disable warning for one large sized constant array (possibly using #pragma <disable_large_size_Array_Warning> and then later enable it back after the constant array declaration is over). In all other cases either fix the code, or fix the compiler flags. Instead of this passing a specific warning to disable works: #pragma GCC diagnostic push. #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-W<evil-option>" #include <evil_file> #pragma GCC diagnostic pop for example: #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #include <QtXmlPatterns> #pragma GCC diagnostic pop Apr 30, 2022 · I want to suppress all compiler warnings when including mylib. 10 Diagnostic Pragmas. Jun 15, 2015 · I wrapped the function the following way, but it still elicits a warning. Although there are some other options, including #pramga warning (once). GCC keeps track of the location of each pragma, and issues diagnostics according to the state as of that point in the source file. -W turns a warning ON, and -Wno-turns a warning OFF. Phil Miller Phil #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunknown-pragmas" #pragma GCC diagnostic ignored "-Wreorder" #include <some_3rd_party_header. This is an extremely useful feature if the compiler warns over something that &quot;has If you're using gcc and want to disable the warning for selected code, you can use the #pragma compiler directive: #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunused-variable" ( your problematic library includes ) #pragma GCC diagnostic pop Oct 15, 2012 · gcc has this warning flag:-Wunknown-pragmas Warn when a #pragma directive is encountered which is not understood by GCC. write(foo, bar, baz); #pragma GCC diagnostic pop. -Wmain ¶. Feb 24, 2015 · I would like to disable specific known warnings in C++ code coming from a library header when compiling my own code. Jan 5, 2024 · 文章浏览阅读1. Jan 25, 2019 · I have used the following code to suppress warnings: Starting from line number 25: #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wincompatible-pointer-types&quot; #include &lt;m Sep 21, 2009 · -w is the GCC-wide option to disable warning messages. Then in the code I used the LOG_W instead. Using the GNU Compiler Collection (GCC) 5. Enclose the code that triggers the warning between the #pragma directives to apply the suppression only to that line. I would go for the option of using #pragma's within the source code, and then providing a sound reason (as a comment) of why you are disabling the warnings. I want to showcase all 7 different ways how to deal with compiler warnings in GCC and Clang. Follow edited Sep 21, 2009 at 3:18. Jun 6, 2022 · #pragma warning を使えば警告を抑制することが出来ます。 外部ライブラリの警告を消すために有用ですが、本来は非推奨です。 使い方. The pragma may control any warning that can be used from the I use -Wall and updating to new gcc I have got a lot of warning: narrowing conversion. h> Oct 8, 2020 · Is there a pragma (rather than a flag) that can be used to disable the warning: unrecognized GCC pragma? Is there a list of warning codes that might be used with pragma diag_suppress anywhere? I can’t seem to find any resource like that. It's a known GCC issue. Thus, pragmas occurring after a line do not affect diagnostics caused by that line. However I still get the warning and unable to find out why. Nov 14, 2022 · (However, in C, such an overflow is still rejected in contexts where an integer constant expression is required. 0 such warnings are actually informational (I've filed a bug). 52. This option controls warnings when an attribute is ignored. GCC supports several types of pragmas, primarily in order to compile code originally written for other compilers. How can I disable these warnings? Some GCC flags may be? P. However, GCC does not understand that flag and I can Aug 15, 2013 · I use GCC 4. Why does it work for other warnings but not for this one? Oct 16, 2021 · The pragma one is a bit of a special case, because it deals with a preprocessor warning, and thus doesn't really disable the warning due to the way GCC deals with the diagnostics/warnings in the compile phase (as you can see in my original post, it just changes the warning from "unknown pragma" to "ignoring unknown pragma"). If this command line option is used, warnings will even be issued for unknown pragmas in system header files. To net everything out, this is an example of temporarily disabling a warning: #pragma GCC diagnostic push. 0. Oct 5, 2019 · The only way to turn this warning off is to disable all warnings with the -w option. edited Jan 20, 2016 at 14:08. #pragma GCC diagnostic ignored "-Wmissing-field-initializers" But my feeling is that you should code with care, and explicitly initialize all the fields. GCC will ignore #pragma clang diagnostic, though. // Code that triggers the warning. The note above from @Dan about using #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunknown-pragmas" is a workable solution if you are willing to surround your unknown #pragmas this way; just a note to close it out with a #pragma GCC diagnostic pop rather than a #pragma GCC diagnostic push. #pragma warning( pop ) // Restore warnings to previous state. 5. If that pragma resides in a header, probably for more. You can check the GCC documentation on diagnostic pragmas for more details. Jul 17, 2015 · I am using pragma once in my . However I am always having a warning #pragma once in main file. What's the closest GCC equivalent to this MSVC preprocessor code?. The only problem is not all 3rd party libraries (like boost) compile without warnings, so I On Microsoft compilers, specific warnings can be disabled with a #pragma, without disabling other warnings. Jul 28, 2015 · I am not interested in seeing #pragma messages for my build. That means GCC is recognizing that I’m asking for the warning to be disabled, but it effectively doesn’t disable it. This is different from the -Wattributes option in that it warns whenever the compiler decides to drop an attribute, not that the attribute is either unknown, used in a wrong place, etc. But I usually have static functions for debugging, or functions that maybe useful sometime in the future, or that are only used temporaly, and I want to keep them in the code. h> #pragma GCC diagnostic pop This approach seems to work in general, but not for the unknown pragma warnings (I still get them). This warning level also warns about left-shifting 1 into the sign bit, unless C++14 mode (or newer) is active. Aug 30, 2010 · A gcc/g++ specific way to suppress the unused parameter warning for a block of source code is to enclose it with the following pragma statements: #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wunused-parameter" <code with unused parameters here> #pragma GCC diagnostic pop The only thing I can think of that would need this is if a 3rd party header causes warnings with compiler flags chosen for a project. Feb 1, 2018 · The good news: You can do this. 6 added diagnostic pragmas that will help solve this problem: #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wdeprecated-declarations" int __attribute__((deprecated)) b() { return a() * 2; //< I want to get rid of warnings from this line } #pragma GCC diagnostic pop Note: This only works in gcc 4. The following example code will tell Clang or GCC to ignore the -Wall warnings: #pragma GCC diagnostic ignored "-Wall" In addition to all of the functionality provided by GCC's pragma, Clang also allows you to push and pop the current warning state. ) No warning is emitted in C++20 mode (and newer), as signed left shifts always wrap. -Wshift-overflow=2. #pragma GCC diagnostic ignored "-Wunused-result". h> #pragma GCC diagnostic pop Since GCC usually provides both a "positive" and "negative" version of the -f flags, I thought about ignoring the "no-permissive" feature: #pragma GCC diagnostic ignored "-fno-permissive" #include <third-party-file. #pragma GCC diagnostic pop. -Wshift-overflow # This is one of the most anoying warnings, although I undestand that it may useful (sometimes) to check dead code. g. I want to disable them, but leave all other warnings untouched (ideally). answered Sep 21, 2009 at 2:49. I want to only disable this specific warning and keep all the other ones. Dec 8, 2009 · Another GCC page specifically on disabling warnings. SleuthEye. kmvy ubrfb yscctvjc urxtq bggjc mengtl iikxme rtzjw rnwfgvm haenn