llvm

Is char signed or unsigned by default on iOS? (I thought this would've been a well answered question, but oddly google turned up nothing at all useful!) JosephH In most cases, char is unsigned on ARM (for performance reasons ) and signed on other platforms. iOS differs from the normal convention for ARM, and char is signed by default. (In particular this differs from Android, where code compiled in the ndk defaults to unsigned char .) This can be changed in xcode, there is a 'char' Type is unsigned option (which defaults to off). If this is changed to "yes", xcode will pass -funsigned-char to

Note: This is question to which I have already found an answer. It seems that posting a question after finding an interesting answer is encouraged , so I am posting this. Someone else is likely to have the same problem and find this useful. I have an iOS app that produces charts. Shortly after publishing an update, a user sent me this panicky email: "the latest update has modified the curves ... not seen more growth curves and inserted data are represented as a line descending ... before you could see perfectly well Help me" I get him to send a screenshot and give more detail. He has an iPhone

Does LLVM automatically convert Objective-C methods to inline functions when possible? (I.e., is it just as performant to create an Objective-C method for a block of code that you could otherwise paste inline?) If LLVM doesn't perform this optimization, why not? If it does, (a) are there certain build settings I must set for this to happen? (b) How can I tell if an Objective-C method will be inlined? No, because its impossible to know in the context of the Obj-C runtime if those kind of optimizations can be performed. The thing to remember is that Obj-C methods are invoked by a message send,

I have a string that I convert to a double like this: double d = [string doubleValue]; The documentation for doubleValue tells us that upon overflow, this method returns either HUGE_VAL or -HUGE_VAL . This is how I checked for this earlier: if (d == HUGE_VAL || d == -HUGE_VAL) //overflow Now, since adding the new "-Weverything" warning flag, the compiler now complains that Comparing floating point with == or != is unsafe How can I resolve this issue? How should I be doing these comparisons? I also have the same question about comparing two "normal" floating point numbers (i.e. not "HUGE_VAL"

I create a llvm::Value* from a integer constant like this: llvm::Value* constValue = llvm::ConstantInt::get( llvmContext , llvm::APInt( node->someInt() )); now i want to retrieve the compile-time constant value back; int constIntValue = constValue->??? The examples shown in LLVM Programmer manual seem to imply that cast<> will accept a pointer when using the type (rather than the type plus pointer) template parameter, however i'm pretty sure thats failing as from 2.8: llvm::Value* foo = 0; llvm::ConstantInt* intValue = & llvm::cast< llvm::ConstantInt , llvm::Value >(foo ); //build error: /

Is it possible to use Clang/LLVM with Eclipse CDT and if so, how is it configured to actually make it work? I am the main author of the (only) LLVM plug-in for Eclipse CDT. It is still in development so might not be suitable for production environment yet. However feel free to test it to find out if it is suitable for your needs. https://github.com/TuononenP/llvm4eclipsecdt UPDATE The latest version is available via official Eclipse update site: http://download.eclipse.org/releases/mars It is under Programming Languages and is named "C/C++ LLVM-Family Compiler Build Support". osgx Here is the

Im trying to get Clang working again on Eclipse and therefore I've tried to install the LLVM toolchain over the Eclipse Marketplace. But when I click Confirm to procceed with the installation I get the following error Unable to read repository at http://petrituononen.com/llvm4eclipsecdt/update. http://petrituononen.com/llvm4eclipsecdt/update is not a valid repository location. This site seems to be down but I cant find any alternative sources. Is there any way to get Clang working on Eclipse Mars ? This is a setup from scratch that worked for me (ubuntu 14.04 + eclipse mars + clang 3.6.2). You