Have a question about this project? Do new devs get fired if they can't solve a certain bug? You are correct, but cocos actually only uses that address as a unique id. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Xcode 5 and iOS 7: Architecture and Valid architectures, xcode build error: Semantic issue cast from pointer to smaller type 'int' loses information, Issues in handling touches on subviews(uiviews) in UIScrollView, Architecture linking error after Xcode 5.1 upgrade, iOS 7.1 gives error after updating to Xcode 5.1, Linker error in Xcode 5.1 with cocos2d-x 3 beta 2. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. ), For those who are interested. Find centralized, trusted content and collaborate around the technologies you use most. All float types are to be converted to double. C99 standard library provides intptr_t and uintptr_t typedefs, which are supposed to be used whenever the need to perform such a cast comes about. No sense in writing a few dozen lines of extra code just to get a bunch of numbered threads. (int) pthread_self() 64int48intuintptr_t (unsigned int) to your account, [87/252] Compiling C object lib/libopenvswitch.a.p/odp-util.c.obj How do I align things in the following tabular environment? *PATCH] platform/x86: hp-wmi: Fix cast to smaller integer type warning @ 2023-01-23 13:28 Hans de Goede 2023-01-23 13:56 ` Hans de Goede 0 siblings, 1 reply; 2+ messages in thread From: Hans de Goede @ 2023-01-23 13:28 UTC (permalink / raw) To: Mark Gross Cc: Hans de Goede, Andy Shevchenko, platform-driver-x86, kernel test robot Fix the following . lexborisov Modest Public. Can we typecast void into int? - Quora Making statements based on opinion; back them up with references or personal experience. And, most of these will not even work on gcc4. The 32 remaining bits stored inside int are insufficient to reconstruct a pointer to the thread function. The reinterpret_cast makes the int the size of a pointer and the warning will stop. Referring to N1570 7.20.1.4/p1 (Integer types capable of holding object pointers): The following type designates a signed integer type with the property Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. In both cases, converting the pointer to an integer type that's too small to represent all pointer values is a bug. reinterpret_cast is a type of casting operator used in C++. Why do academics stay as adjuncts for years rather than move around? I don't see how anything bad can happen . I'm unfamiliar with XCode, but the solution should be something like follows: Most of the "solutions" above can lose part of the pointer address when casting to a smaller type. I have a two functions, one that returns an int, and one that takes a const void* as an argument. This solution is in accordance with INT18-C. Connect and share knowledge within a single location that is structured and easy to search. Yesterday, I updated Xcode to the newest version (5.1 (5B130a)) to compatible with iOS 7.1. The result is the same as implicit conversion from the enum's underlying type to the destination type. Since gcc compiles that you are performing arithmetic between void* and an int (1024). In the case of Widening Type Casting, the lower data type (having smaller size) is converted into the higher data type (having larger size). actually no, as int my be a smaller type than a pointer ;-) But, of course with int64_t it works fine. If your code has the chance to ever be ported to some platform where this doesn't hold, this won't work. So you know you can cast it back like this. Infact I know several systems where that does not hold. Instead of using a long cast, you should cast to size_t. equal to the original pointer: First you are using a define, which is not a variable. This forum has migrated to Microsoft Q&A. An object pointer (including void*) or function pointer can be converted to an integer type using reinterpret_cast. Floating-point conversions Why is there a voltage on my HDMI and coaxial cables? what happens when we typecast normal variable to void* or any pointer variable? The mapping in pointer<->integer casts is implementation defined, but the intent was that if the pointer type is large enough and isn't forcefully aligned (, But that's different. It is done by the compiler on its own, without any external trigger from the user. On a 64-bit Windows computer, 'long' is a 32-bit type, and all pointers are 64-bit types. clang11 report error: cast to smaller integer type #82 - GitHub Netdev Archive on lore.kernel.org help / color / mirror / Atom feed * [mst-vhost:vhost 5/52] drivers/block/virtio_blk.c:539:21: warning: assignment to 'void *' from . Number Type Cast | Qt Forum Identify those arcade games from a 1983 Brazilian music video, Relation between transaction data and transaction id, The difference between the phonemes /p/ and /b/ in Japanese. Star 675. Fix for objc/45925 Therefore it is perfectly valid for the compiler to throw an error for a line like. error: cast from 'void*' to 'int' loses precision - Stack Overflow The compiler issues the "cast from integer to pointer of different size" warning whenever the value of an integer is converted to a pointer, especially when the memory allocated to a pointer is smaller than the memory allocated to an integer data type. this way you won't get any warning. If the value in a pointer is cast to a different type and it does not have the correct alignment for the new type, the behavior is undefined. As for the stack, I've written a few libraries using pthreds, thus I don't agree that what you describe "is quite often the case". ../lib/odp-util.c:5601:9: note: expanded from macro 'SCAN_PUT' Passing arguments to pthread_create - invalid conversion from void(*)() to void(*)(void*). If the function had the correct signature you would not need to cast it explicitly. I usually have all automatic conversion warnings effective when developing in C, and I use explicit casting in order to suppress a specific . Can Martian regolith be easily melted with microwaves? Is it possible to create a concave light? I'm trying to create a void* from an int. Functions return bigint only if the parameter expression is a bigint data type. what does it mean to convert int to void* or vice versa? But, sure, in that specific case you can pass a local variable address, type casting integer to void* [duplicate]. Can anybody explain how to pass an integer to a function which receives (void * ) as a parameter? It is purely a compile-time directive which instructs the compiler to treat expression as if it had . a is of type int[4], which can be implicitly cast to int* (ie, a pointer to an int) &a is of type int(*)[4] (ie: a pointer to an array of 4 ints). Thank you all for your feedback. Please unaccept the answer you have chosen as it is wrong (as the comments below it say) and will lead to bugs. Replacing broken pins/legs on a DIP IC package, How to handle a hobby that makes income in US. Difficulties with estimation of epsilon-delta limit proof. You cannot just cast the 32-bit variable to a pointer, because that pointer on a 64-bit machine is twice as long. The following behavior-changing defect reports were applied retroactively to previously published C++ standards. You may declare a const int variable and cast its reference to the void*. What you do here is undefined behavior, and undefined behavior of very practical sort. Just re-enforcing the old behavior of Xcode 5.0 and earlier versions, that already cut away parts of the address by casting it to int, won't introduce any new bugs and avoids the need to learn and understand lots of implementation-internal cocos code. error: cast from pointer to smaller type 'unsigned int' loses @Martin York: No, it doesn't depend on endiannness. To learn more, see our tips on writing great answers. error: cast from pointer to smaller type 'unsigned int' loses information. The calculated expression consists of two operations. Making statements based on opinion; back them up with references or personal experience. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Update: Today, i download the latest version of cocos2d-x (cocos2d-x 2.2.3). The point is (probably) that the value passed to the thread is an integer value, not really a 'void *'. ", "? ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Alternatively, if you choose to castthe ptr variableto (size_t) instead, then you don't need to worry about the pointer typeanymore. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You are getting warnings due to casting a void* to a type of a different size. Mutually exclusive execution using std::atomic? I have the following function and when I compile it under VS.NET 2005, the following compile warnings show up: Warning1warning C4311: 'type cast' : pointer truncation from 'void *' to 'long'c:\temp\testone\lib\utils.c56Warning2warning C4312: 'type cast' : conversion from 'unsigned long' to 'void *' of greater sizec:\temp\testone\lib\utils.c56, Code Snippet Create an account to follow your favorite communities and start taking part in conversations. then converted back to pointer to void, and the result will compare RNINGS" "-D_CRT_SECURE_NO_DEPRECATE" -MD -MQ lib/libopenvswitch.a.p/odp-util.c.obj -MF "lib\libopenvswitch.a.p\odp-util.c.obj.d" -o lib/libopenvswitch.a.p/od windows meson: cast to smaller integer type 'unsigned long' from 'void *'. Find centralized, trusted content and collaborate around the technologies you use most. you can just change architecture to support 32 bit compilation by all below in in Build Settings. Is a PhD visitor considered as a visiting scholar. FAILED: lib/libopenvswitch.a.p/odp-util.c.obj Using Kolmogorov complexity to measure difficulty of problems? Such pointers can be stored in 32-bit data types (for instance, int, DWORD). void* to an array - C++ Forum - cplusplus.com Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. "-I.." "-Iinclude\openflow" "-I..\include\openflow" "-Iinclude\openvswitch" "-I..\include\openvsw The pointer doesn't actually point to anything, but it's the result of an earlier cast from an integer to a pointer (e.g. returnPtr = (void **) malloc (x * sizeof(void *)); ptr = (void *) malloc (x * y * size); Offline ImPer Westermark over 11 years ago in reply to Andy Neil Except that you sometimes stores an integer in the pointer itself. Implementing From will result in the Into implementation but not vice-versa. The only exception is exotic systems with the SILP64 data model, where the size of int is also 64 bits. Clang warnings for an invalid casting? - The FreeBSD Forums Returns a value of type new-type. 7.1 New Cast Operations The C++ standard defines new cast operations that provide finer control than previous cast operations. C/C++ , Cerror: cast to 'void *' from smaller integer type 'int'. Casting type void to uint8_t - Arduino Forum This returns the first 32 bits of the pointer which may be the top or the bottom depending on big versus little endian, as comment #2 said. However even though their types are different, the address is going to be the same. What I am trying to emphasis that conversion from int to pointer and back again can be frough with problems as you move from platform to platform. Casting arguments inside the function is a lot safer. For integer casts in specific, using into() signals that . Already on GitHub? This is not a conversion at all. STR34-C. Please help me compile Chez Scheme. The difference between the phonemes /p/ and /b/ in Japanese, Styling contours by colour and by line thickness in QGIS, AC Op-amp integrator with DC Gain Control in LTspice, Identify those arcade games from a 1983 Brazilian music video. Anw, the project still build and run normally when i use Xcode 5.0 with iOS 7.0. How to Cast a void* ponter to a char without a warning? In Java, there are two types of casting: Widening Casting (automatically) - converting a smaller type to a larger type size. How do I work around the GCC "error: cast from SourceLocation* to int loses precision" error when compiling cmockery.c? A cast specifies a conversion from one type to another. This will get you a pointer from a 32 bit offset: A function pointer is incompatible to void* (and any other non function pointer). How can this new ban on drag possibly be considered constitutional? To learn more, see our tips on writing great answers. Note the difference between the type casting of a variable and type casting of a pointer. reinterpret_cast<void *>(42)). Casting type void to uint8_t - Arduino Forum A sane compiler may throw a warning on lines like this but by no way it should throw an error, because this code is NOT wrong, it is just potentially error-prone, but can be perfectly valid. What is the purpose of non-series Shimano components? } SCAN_END_SINGLE(ATTR) If you preorder a special airline meal (e.g. Implicit conversions - cppreference.com Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, error: cast from void* to int loses precision, cast to pointer from integer of different size, pthread code. While working with Threads in C, I'm facing the warning, "warning: cast to pointer from integer of different size". Thanks for contributing an answer to Stack Overflow! ", "!"? int, bigint, smallint, and tinyint (Transact-SQL) - SQL Server If that happens soon after the call to pthread_create() then you have a race condition, because there's a chance that the thread will attempt to read x's value after it's life has ended, which invokes undefined behavior. How to use Slater Type Orbitals as a basis functions in matrix method correctly? } SCAN_END_SINGLE(ATTR) (void *)i Error: cast to 'void *' from smaller integer type 'int' PS: UBUNTUCLANG3.5 clang -O0 -std=gnu11 -march=native -lm -lpthread pagerank.c -o pagerank c pthreads 4 10.3k 2 21 2015-06-05 A void pointer can be really useful if the programmer is not sure about the data type of data inputted by the end user. ERROR: incompatible integer to pointer conversion assigning to 'string' (aka 'char *') from 'int', error: cast to 'string' (aka 'char *') from smaller integer type 'int' [-Werror,-Wint-to-pointer-cast], error: incompatible integer to pointer conversion assigning to 'string' (aka 'char *') from 'int' C, warning: initialization of 'unsigned char' from 'uint8_t *' {aka 'unsigned char *'} makes integer from pointer without a cast [-Wint-conversion], Minimising the environmental effects of my dyson brain. In such condition type conversion (type promotion) takes place to avoid loss of data. -1, Uggh. Surely the solution is to change the type of ids from int to type that is sufficiently large to hold a pointer. Cerror: cast to 'void *' from smaller integer type 'int' If the value is ever used as pointer again that will prove to be an extremely bad idea. That could create all kinds of trouble.

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