cast to void *' from smaller integer type 'int cast to void *' from smaller integer type 'int

Cast Operations - Oracle GitHub Skip to content Product Solutions Open Source Pricing Sign in Sign up smadaminov / ovs-dpdk-meson-issues Public Notifications Fork 1 Star 1 Code Issues 66 Pull requests Actions Projects 1 Security Insights New issue As a result of the integer division 3/2 we get the value 1, which is of the int type. you can just change architecture to support 32 bit compilation by all below in in Build Settings. 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. Casting arguments inside the function is a lot safer. This is an old C callback mechanism so you can't change that. void* -> integer -> void* rather than integer -> void* -> integer. He should pass the address of the integer, the thread should get that address, Note: This is only appropriate is you cast the. This example is noncompliant on an implementation where pointers are 64 bits and unsigned integers are 32 bits because the result of converting the 64-bit ptr cannot be represented in the 32-bit integer type. Yeah, the tutorial is doing it wrong. If any, how can the original function works without errors if we just ignore the warning. warning C4311: 'type cast': pointer truncation from 'void *' to 'long' in ECPG test files. You are getting warnings due to casting a void* to a type of a different size. SCAN_PUT_ATTR(mask, ATTR, smask, FUNC); Making statements based on opinion; back them up with references or personal experience. There is no "correct" way to store a 64-bit pointer in an 32-bit integer. You cannot just cast the 32-bit variable to a pointer, because that pointer on a 64-bit machine is twice as long. 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 Casting type void to uint8_t - Arduino Forum Even if you are compiling your program for a 32-bit computer, you should fix your code to remove these warnings, to ensure your code is easily portable to 64-bit. I need to convert the argument to an int for later use: The compiler (GCC version 4.2.4) returns the error: You can cast it to an intptr_t type. To be honest, I think, clang is too restrictive here. Don't do that. itch" "-I..\include\windows" "-Iinclude" "-I..\include" "-I..\datapath-windows\include" "-IC:\PTHREADS-BUILT\include" "-Xclang" "-fcolor-diagnostics" "-pipe" What is the difference between const int*, const int * const, and int const *? @DavidHeffernan, sane thread APIs wouldn't send integral data to the thread procedures, they would send pointers. Here is some piece of code where that error occur: /cocos2d-x-2.2.2/cocos2dx/platform/ios/EAGLView.mm:408:18: Cast from pointer to smaller type 'int' loses information. pthread passes the argument as a void*. Please note that the error I am receiving is "cast to smaller integer type 'int' from 'string' (aka 'char *')" referencing line of code: while (isalpha(residents[i].name) == 0). Using Kolmogorov complexity to measure difficulty of problems? 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. 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 What video game is Charlie playing in Poker Face S01E07? rev2023.3.3.43278. Bulk update symbol size units from mm to map units in rule-based symbology. Fork 63. Why does setupterm terminate the program? While working with Threads in C, I'm facing the warning, "warning: cast to pointer from integer of different size". Asking for help, clarification, or responding to other answers. It is done by the compiler on its own, without any external trigger from the user. How Intuit democratizes AI development across teams through reusability. Not the answer you're looking for? I personally upvoted this answer because by it's first line of text it helped me to understand the reason of this strange error message and what am I, poor idiot, doing :D. Not valid on Windows 64 - long is still 32-bit but pointers are 64-bit. @Martin York: No, it doesn't depend on endiannness. Why did Ukraine abstain from the UNHRC vote on China? How to correctly cast a pointer to int in a 64-bit application? Making statements based on opinion; back them up with references or personal experience. then converted back to pointer to void, and the result will compare Getting Command /bin/sh failed with exit code 65 Error with Xcode 5.1 . I need to cast the int from the first function so that I can use it as an argument for the second function. In simple example code like this it's very easy to convince yourself that there's no problem, but in more elaborate real-world scenarios it's very easy to make this mistake inadvertently. ), Styling contours by colour and by line thickness in QGIS. My code is all over the place now but I appreciate you all helping me on my journey to mastery! There's probably little you can do except look or hope for a fixed 2.x version or upgrade to 3.x (I would assume it's 64-bit safe but this is just a guess, do research this issue before you upgrade). No idea how it amassed 27 upvotes?! And in the function you get the value of the pointer by using the dereference operator *: Please read why glib provide macros for this kind of conversions, there's no need to repeat the text here. whether it was an actual problem is a different matter though. This is not even remotely "the correct answer". How to use Slater Type Orbitals as a basis functions in matrix method correctly? What is the point of Thrower's Bandolier? If you write ((char*)ptr + 1), it will advance the pointer 1 byte, because a "char" is 1 byte. Properly casting a `void*` to an integer in C++ 24,193 Solution 1 I think using intptr_t is the correct intermediate here, since it's guaranteed to be large enough to contain the integral value of the void*, and once I have an integer value I can then truncate it without causing the compiler to complain. Click to see the query in the CodeQL repository. However the actual code in question contains an explicit c-style cast to int. this way you won't get any warning. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. What is the point of Thrower's Bandolier? Does Counterspell prevent from any further spells being cast on a given turn? That could create all kinds of trouble. See also this documentation.. From and Into are generally intended to be lossless, infalliable conversions.as on the other hand can discard data and lead to bugs in some situations, for example casting a u64 to a usize may truncate the value on a 32-bit host. If you need to keep the returned address, just keep it as void*. Converting one datatype into another is known as type casting or, type-conversion. In the best case this will give the same results as the original code, with no advantages, but in the worst case it will fail in multiple catastrophic ways (type punning, endianness, less efficient, etc. vegan) just to try it, does this inconvenience the caterers and staff? eg. Usually that means the pointer is allocated with. Find centralized, trusted content and collaborate around the technologies you use most. property that any valid pointer to void can be converted to this type, "because the type "int" supports only -32768 ~ 32768" This is not true for any modern desktop or mobile OS or any OS that is targeted by cocos2d-x. So,solution #3 works just fine. If the original type is a void *, converting to an int may lose date on platforms where sizeof(void *) != sizeof(int) (which is true of LP64 programming model). cast to 'void *' from smaller integer type 'int' How Intuit democratizes AI development across teams through reusability. ^~~~~~~~~~~~~~~~~~~~ Apparently the clang version in Xcode 5.1 and above is more strict about potential 32bit vs. 64 bit incompatibilities in source code than older clang versions have been. Type conversions - cplusplus.com The preprocesor absolutely will not perform arithmetic. Thanks Jonathan, I was thinking about my answer in another thread: AraK is correct, passing integers a pointers are not necessarily interchangeable. This explicit cast clearly tells the compiler "Shut up, I know that this code does not look correct, but I do know what I am doing". Re: [PATCH, PR 53001] Re: Patch to split out new warning flag for "I think what you should do is actually pass the address of the variable to the function" Not necessarily. what does it mean to convert int to void* or vice versa? 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. The correct answer is, if one does not mind losing data precision. The result is implementation-defined and typically yields the numeric address of the byte in memory that the pointer pointers to. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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 . As with all cast expressions, the result is: Two objects a and b are pointer-interconvertible if: static_cast may also be used to disambiguate function overloads by performing a function-to-pointer conversion to specific type, as in. I'm trying to create a void* from an int. Find centralized, trusted content and collaborate around the technologies you use most. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. with ids being an array of ints and touch being a pointer. This solution is in accordance with INT18-C. FAILED: lib/libopenvswitch.a.p/odp-util.c.obj The only exception is exotic systems with the SILP64 data model, where the size of int is also 64 bits. Casting an open pointer to other pointer types and casting other pointer types to an open pointer does not result in a compile time error. If the destination type is bool, this is a boolean conversion (see below). "After the incident", I started to be more careful not to trip over things. 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. ^~~~~~~~~~~~~~~~~~~ return ((void **) returnPtr);} /* Matrix() */. Taking the above declarations of A, D, ch of the . Why do small African island nations perform better than African continental nations, considering democracy and human development? INT31-C. Ensure that integer conversions do not result in lost or linux c-pthreads: problem with local variables. The high-order 9 bits of the number are used to hold a flag value, and the result is converted back into a pointer. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? So reinterpret_cast has casted it to long type and then static_cast safely casts long to int, if you are ready do truncte the data. That's not a good idea if the original object (that was cast to void*) was an integer. I'm trying to learn pthreads and thing that keeps bugging me is how do i really pass argument to the function. I have looked around and can't seem to find any information on how to do this. you can pass the int value as void pointer like (void *)&n where n is integer, and in the function accept void pointer as parameter like void foo (void *n); and finally inside the function convert void pointer to int like, int num = * (int *)n;. What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. XCode 5.1 is change all architecture to 64 bit. The subreddit for the C programming language, Press J to jump to the feed. error: cast from pointer to smaller type 'unsigned int' loses Or, they are all wrong. What happens if you typecast as unsigned first? Here, the Java first converts the int type data into the double type. Find centralized, trusted content and collaborate around the technologies you use most. For integer casts in specific, using into() signals that . long guarantees a pointer size on Linux on any machine. Connect and share knowledge within a single location that is structured and easy to search. All character types are to be converted to an integer. Noncompliant Code Example (memset())For historical reasons, certain C Standard functions accept an argument of type int and convert it to either unsigned char or plain char. [Solved] Properly casting a `void*` to an integer in C++ Thanks for contributing an answer to Stack Overflow! Find centralized, trusted content and collaborate around the technologies you use most. 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. The best way is, if one can, do not do such casting, instead, if the same memory address has to be shared for pointer and int (e.g. You can only do this if you use a synchronization primitive to ensure that there is no race condition. . Thanks for contributing an answer to Stack Overflow! A cast converts an object or value from one type to another. How to make compiler not show int to void pointer cast warnings, incompatible pointer types assigning to 'void (*)(void *)' from 'int (int *)'. ^~~~~~~~~~~~~~~~~~~~~ So the compiler is very picky here and the correct solution to make the code compile again and still let it show the exact same behavior like in Xcode 5.0 is to first cast to an integer type with a size that matches the one of a pointer and to then do a second cast to the int that we actually want: ids [i] = (int) (size_t)touch; *sound/soc/codecs/tlv320aic32x4.c:1202:18: warning: cast to smaller integer type 'enum aic32x4_type' from 'void *' @ 2022-04-22 9:48 kernel test robot 0 siblings, 0 . for (i=0, j=0; jCasting and type conversions - C# Programming Guide Otherwise, if the original pointer value points to an object a, and there is an object b of the . cast to 'double *' from smaller integer type 'unsigned int' The C compiler is gcc, clang version 3.9.1, target aarch64--linux-android, thread model posix. An open (void) pointer can hold a pointer of any type. On a 64-bit Windows computer, 'long' is a 32-bit type, and all pointers are 64-bit types. Wrong. } SCAN_END_SINGLE(ATTR) Find centralized, trusted content and collaborate around the technologies you use most. The problem just occur with Xcode 5.1. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? reinterpret_cast conversion - cppreference.com You use the address-of operator & to do that int x = 10; void *pointer = &x; And in the function you get the value of the pointer by using the dereference operator *: int y = * ( (int *) pointer); Share Improve this answer Follow edited Apr 15, 2013 at 13:58 answered Apr 15, 2013 at 13:53 Some programmer dude 394k 35 393 602 1 iphone - Error "Cast from pointer to smaller type 'int' loses to your account, [87/252] Compiling C object lib/libopenvswitch.a.p/odp-util.c.obj Fix for objc/45925 ../lib/odp-util.c:5834:5: error: cast to smaller integer type 'unsigned long' from 'void *' [-Werror,-Wvoid-pointer-to-int-cast]