Warning but liberally disable warnings from it that are not useful. The strategy I prefer, followed by other projects such as CppUTest 5, is to enable the Single warning available to Clang! Many suggest you should never flip on this flag in aīuild. One flag there are some strong opinions 4 about is -Weverything which literally enables every FP64 SOFTWARE EMULATION CODEMemset (buf, 0x0, NUM_ITEMS ) # Don't enable any warnings for memset-elt-size $ EXTRA_CFLAGS = "-Wall -Werror -Wno-memset-elt-size" makeīy design, Clang generally matches the set of compiler flag options available in the GNU toolchain, but there are a few that are different.įor embedded projects, it’s useful to cross-compile the source code with Clang to surface additional Main.c:48:3: warning: 'memset' used with length equal to number of elements without multiplication by element size Main.c:47:3: error: 'memset' used with constant zero length parameter this could be due to transposed parameters # Warn about memset-elt-size but don't error on it $ EXTRA_CFLAGS = "-Wall -Werror -Wno-error=memset-elt-size" make Let’s try it out for our example above! For example: -Wno-error= to keep the warning enabled but not trigger an error.-Wno- to disable the warning altogether. These canĮasily be controlled with the following compiler options: Sometimes, there may be warnings you do not wish to trigger an error or even a warning. That compiler version be used by the rest of the team. FP64 SOFTWARE EMULATION UPDATEMember can update to the new version, fix up any new issues, and then merge an update requiring As new versions become available, one team That way everyone will see the exact same errors and behavior. NOTE: I’d recommend enforcing a certain compiler version be used in your build system (for localĭevelopment and in CI). Typically, it’s a very small set of changes required to fix Must have to prevent code with warnings from being merged to master.Įnabling -Werror does mean that when the compiler version changes, new compilation errors mayĪppear (since new sets of warnings are usually added to flags like -Wall and pre-existing checksĪre improved and can catch new errors). Not everyone may be as excited about fixing compiler warnings as you. Useful to ensure that no new warnings slip into a codebase. Werror causes all enabled warnings to cause compilation errors. Main.c:20:3: warning: 'memset' used with length equal to number of elements without multiplication by element size Main.c:19:3: warning: 'memset' used with constant zero length parameter this could be due to transposed parameters Main.c: In function 'prv_various_memset_bugs': Here’s a c snippet that will happily compile but has a couple unfortunate bugs. The exact list of flags varies between compiler versions but can easily be found by consulting the GCC documentation for the compiler version you are using 3. Wextra enables an additional set of flags not covered by -Wall The compiler flag -Wall enables a base set of warnings generally agreed upon as being useful and easy to fix. Introducing regressions or upsetting fellow developers trying to review your change. Trying to fix thousands of warnings all at the same time is a recipe for System (i.e new files) with a more stringent set of warning flags or enabling and fixing sets of I’d recommend taking an incremental approach when transitioning the project by only compiling parts of your NOTE: When enabling warning flags for a project that hasn’t used them previously, there will likely be a GCC and Clang have several warning flags which will enable a collection of useful checks which we Issues at compilation time than when unexpected behavior is encountered on your platform. Runtime and enforcing conventions that lead to a more readable codebase. The Best Aggregate Warning OptionsĬompiler warnings are the first line of defense against catching various errors that could arise at Toolchain and make installed on your computer. To compile the examples, you will need the 8.3.1 GNU Arm Embedded 2 If you would like to follow along compiling the examples presented in this article, all theĬode can be found on Github 1. Working towards these goals on projects I’ve been involved with. The flags presented in this article were chosen based on how much they have aided or hindered Catching common programmatic errors before executing any code.-ffunction-sections, -fdata-sections, & -gc-sectionsįor any embedded software project, three aspects typically crucial for success are:.The Best Options for Debugability & Code Size.The Best One-Off Warning Options (options not covered by -Wall or -Wextra).
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