clang

问题 In this answer I proposed that marihikari use the standard functionality of mktime rather than trying to implement his own Gregorian calendar system. I wrote this function to demonstrate how mktime could be used to accomplish this: bool leap_year(int year) { tm bar = { 0, 0, 0, 29, 1, year - 1900 }; mktime(&bar); return bar.tm_mday == 29 && bar.tm_mon == 1 && bar.tm_year == year - 1900; } Testing this with: cout << "2000: " << leap_year(2000) << "\n2001: " << leap_year(2001) << "\n2004: " <<

问题 I'm working on a (very) simple class in C++ that has a unordered_map member: class SDLFontManager : public CPObject, public FontManagerProtocol { public: SDLFontManager() {}; // flush the cache when the manager is destroyed virtual ~SDLFontManager() { flushFontCache(); }; // load a font from the cache if it exists, or load it from file and cache it. virtual FontProtocol* fontWithTTF(const char* filename) { if(_cache.find(filename) != _cache.end()) { return _cache[filename]; } SDLFont* font =

问题 I'd like to create shell aliases that will always use the "latest" version of the C/C++ standards supported by gcc / g++ / clang / clang++ (one alias for C, one alias for C++). I realize that this could have multiple interpretations: The latest GNU-extended standard The latest released standard (e.g. C++14) The latest unreleased standard (e.g. C++1z) The latest standard fully implemented by the compiler (e.g. C++11 for GCC 4.9, C++14 for GCC 5+) ... possibly other options I haven't thought of

问题 I think block is the Objective-C feature. Recently I am adding the block to some C source file and I found it just compile OK. I get confused, for *.c file, should the compiler(Clang) consider it as the pure C file, why it can permit block? 回答1: Actually Clang introduces blocks to C and, by extension, Objective-C, C++, and Objective-C++ As you can read here in the overview. Of course, using blocks makes your source incompatible with C11 standard but, you know, as long as your code is for Mac

问题 Edit i found http://llvm.org/docs/GettingStartedVS.html Because of this, clang cannot parse the C++ standard library included with Visual Studio, nor parts of the Windows Platform SDK. So, if C++ is not supported with Visual Studio headers, should i still write a bug report? Q: I installed the clang visual studio toolchain from http://llvm.org/builds/. Using VS2013, i get several errors when compiling any c++ header. For example: #include <memory> int main() { return 0; } These errors seem to

问题 I'm trying to discover Clang's equivalent to GCC's __builtin_darn() on Power9. Grepping Clang 7.0 sources it looks like LLVM supports it: llvm_source$ cat llvm/test/MC/PowerPC/ppc64-encoding.s | grep darn -B 1 -A 1 # CHECK-BE: darn 2, 3 # encoding: [0x7c,0x43,0x05,0xe6] # CHECK-LE: darn 2, 3 # encoding: [0xe6,0x05,0x43,0x7c] darn 2, 3 However, I can't seen to find the builtin: llvm_source$ grep -IR darn | grep builtin llvm_source$ What is Clang equivalent of GCC's __builtin_darn() ? 回答1: You

问题 I am currently building a parser for C++ code using the clang C API. The parser will process a header file and generate a list of defined and missing symbols for it (it ignores include directives, so it will parse strictly the contents of the header). My problem is, if I have a typedef for a function pointer which takes an argument of an undefined type, such as: typedef SOME_TYPE (* funcPtrName)(SOME_UNDEF_TYPE x); the AST parses SOME_TYPE as the typedef instead of funcPtrName . If I replace

问题 In my C++ program, I am including boost's filesystem and regex headers and eventually thread support. I would like cmake and clang to link against them during build time. I am receiving the following error: [100%] Building CXX object CMakeFiles/a.out.dir/src/main.cpp.o Linking CXX executable a.out /usr/bin/ld: CMakeFiles/a.out.dir/src/main.cpp.o: undefined reference to symbol '_ZN5boost6system15system_categoryEv' /usr/lib/libboost_system.so.1.56.0: error adding symbols: DSO missing from

问题 Here's what I have on my Mac: clang --version Apple LLVM version 10.0.0 (clang-1000.10.44.4) Target: x86_64-apple-darwin17.7.0 Thread model: posix InstalledDir: /Library/Developer/CommandLineTools/usr/bin my app needs to be compiled with clang version 9, how can I install it on my Mac? I went to LLVM official site, but I don't see Clang 9 there. Any help is greatly appreciated! 回答1: I downloaded Xcode 9.2 and then did xcode-select -s /Applications/Xcode.app/Contents/Developer and then my

问题 I am preparing a package (which makes use of Rcpp and RcppArmadillo) for submission to CRAN. I am using Travis CI and I have included the following to test my package more thoroughly: os: - linux - osx compiler: - clang - gcc This, however, yields the (familiar, it seems) error when using clang on OS X * installing *source* package ‘my_pkg’ ... ** libs clang++ -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I"/Users/travis/R/Library/Rcpp/include" -I"/Users/travis/R/Library