compilation

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Unit test compile-time error I'm wondering if its possible to write a kind of unit test which will verify that a given code doesn't compile. For example, I have a template class: #include <boost/static_assert.hpp> #include <boost/type_traits/is_base_of.hpp> struct bar_base {}; template <typename T> class foo { BOOST_STATIC_ASSERT(::boost::is_base_of<T, bar_base>::value); }; So, the test should succeed with:

问题 I have recently recompiled my php and suddenly old code (together with examples from the internet) stopped compiling. This exact example does not compile. Snippet of the problematic code: static function_entry hello_functions[] = { {NULL, NULL, NULL} }; This is the error: /home/user/php_module/test_module/hello.c:12: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘hello_functions’ What could be the problem? 回答1: Solution : It's the difference for new php 5.4 Found the answer

问题 Suppose I generate a C program during execution time: source = "int add_x_y(int x, int y){ return x + y; }"; source_size = 42; I want the following function: void* compile(char* source, int source_size); Such that: int (*f)(int,int) = compile(source, source_size); printf("%d\n",f(2,3)); Outputs: 5 And compile can't depend on external tools (compilers), as I'd like to use it in emscripten (which converts a C program to a .js file). Is that possible? 回答1: Someone else can probably fill in some

问题 The traditional answer to "why is Javascript slower than native code?" is: "Because it's interpreted". The problem with this claim is that interpretation is not a quality of the language itself. As a matter of fact, nowadays most Javascript code is being JITed, still, this isn't even close to native speed. What if we remove the interpretation factor from the equation and make Javascript AOT compiled? Will it then match the performance of native code? If yes, why isn't this widely done over

问题 When I try to compile my program on ubuntu using gcc, i get these errors: main.c:(.text+0x162): undefined reference to json_parse' main.c:(.text+0x182): undefined reference to json_value_free' However, these functions are included in a file called json.h, which I import in main.c and which I include in my gcc command. Anyone got a clue? 回答1: You should not compile the "json.h" header. The undefined reference is not a compiler error, it's a linker error . It means you have either not compiled

问题 When I try to compile my program on ubuntu using gcc, i get these errors: main.c:(.text+0x162): undefined reference to json_parse' main.c:(.text+0x182): undefined reference to json_value_free' However, these functions are included in a file called json.h, which I import in main.c and which I include in my gcc command. Anyone got a clue? 回答1: You should not compile the "json.h" header. The undefined reference is not a compiler error, it's a linker error . It means you have either not compiled

问题 According to MDN's RegExp Guide regular expression literals are compiled while RegExp objects created by calling the constructor are not. My question is now, when does the compilation take place? As the literal has unique syntax it is identified as a regular expression during parsing. This would make it possible to compile it once and reuse the result every time it gets evaluated resulting in the two examples having (almost) the same speed. var str = "Hello World"; // Example 1 var regExp1 =

问题 According to MDN's RegExp Guide regular expression literals are compiled while RegExp objects created by calling the constructor are not. My question is now, when does the compilation take place? As the literal has unique syntax it is identified as a regular expression during parsing. This would make it possible to compile it once and reuse the result every time it gets evaluated resulting in the two examples having (almost) the same speed. var str = "Hello World"; // Example 1 var regExp1 =

问题 I've been trying to compile a very simple test.clj in Clojure without any success. I have a thread on the Clojure Google Group with several responses, but nothing has helped. To quickly summarize, here is my clojure file: (ns test.test (:gen-class)) (defn -main [gre] (println (str "Hello " gre))) Basically it's the example file provided in the Clojure documentation. I have placed this file appropiately in clojure/src/test/test.clj , and should be able to compile with (compile 'test.test) ,

问题 I would like to fix this warning that give me each build this output: Error:warning: Ignoring InnerClasses attribute for an anonymous inner class Error:(com.sun.jna.Native$1) that doesn't come with an Error:associated EnclosingMethod attribute. This class was probably produced by a Error:compiler that did not target the modern .class file format. The recommended Error:solution is to recompile the class from source, using an up-to-date compiler Error:and without specifying any "-target" type