compilation

Create a valid shared library in C

由 拈花ヽ惹草 提交于 2019-12-07 09:12:34
I'm doing some test to learn how to create shared library. The template for shared libraries in Code::Blocks is this library.c // The functions contained in this file are pretty dummy // and are included only as a placeholder. Nevertheless, // they *will* get included in the shared library if you // don't remove them :) // // Obviously, you 'll have to write yourself the super-duper // functions to include in the resulting library... // Also, it's not necessary to write every function in this file. // Feel free to add more files in this project. They will be // included in the resulting

symbol(s) not found for architecture x86_64 os x lion

由 徘徊边缘 提交于 2019-12-07 09:01:20
问题 When trying to compile a simple c++ test.cpp code with opencv 2.3.1 as as third library, I get the following error message: Undefined symbols for architecture x86_64: "_cvLoadImage", referenced from: _main in test.cpp.o ld: symbol(s) not found for architecture x86_64 For info, am using CMake for linking, and gcc 4.2.1 i686-apple-darwin11 obtained from Xcode 4.2. OpenCV had been installed using CMake: ccmake ../sourcecode Note please that I get a similar message when trying to compile SoQt

Why is Maven skipping over my custom generate-sources executions?

由 爱⌒轻易说出口 提交于 2019-12-07 07:13:23
I added executions for .thrift -> .java as part of the generate-sources phase, using maven-antrun-plugin . But when I enter mvn generate-sources , Maven skips right over this execution. Any idea why it would do this? pom.xml: <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> ... <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <build> <plugins> <plugin>

Compiling Regular Expressions in Python

由 送分小仙女□ 提交于 2019-12-07 07:13:08
问题 I'm working through Doug Hellman's "The Python Standard Library by Example" and came across this: "1.3.2 Compiling Expressions re includes module-level functions for working with regular expressions as text strings, but it is more efficient to compile the expressions a program uses frequently." I couldn't follow his explanation for why this is the case. He says that the "module-level functions maintain a cache of compiled expressions" and that since the "size of the cache" is limited, "using

Scala - how to go resolve “Value is not a member of Nothing” error

由 こ雲淡風輕ζ 提交于 2019-12-07 06:56:10
问题 This example code is based on Atmosphere classes, but if someone could give me some insights into what the error means in general, I think I can figure out any Atmosphere-specific solution... val bc = BroadcasterFactory.getDefault().lookup(_broadcasterId) bc.broadcast(message) After the first line, bc should contain a handle to an object whose class definition includes the method broadcast() -- in fact, it contains several overloaded variations. However, the compiler chokes on the second line

Building a Boost.Python application on MacOS 10.9 (Mavericks)

由 吃可爱长大的小学妹 提交于 2019-12-07 06:43:20
问题 I upgraded to Mavericks, and am now unable to build my application after much troubleshooting. During linking, I receive the errors Undefined symbols for architecture x86_64: "boost::python::objects::function_object(boost::python::objects::py_function const&, std::pair<boost::python::detail::keyword const*, boost::python::detail::keyword const*> const&) . . . "boost::python::objects::register_dynamic_id_aux(boost::python::type_info, std::pair<void*, boost::python::type_info> (*)(void*))" I am

Can I install a pre-configured Perl binary package in my home directory?

由 [亡魂溺海] 提交于 2019-12-07 06:27:22
问题 I want to set up Perl 5.10 in my home directory in addition to the ancient Perl currently on the machine in the /usr/local. I am not a super-user on this machine. I found the require 5.10 HPUX perl binary package and it seems to work, but for some reason it seems to assume it's running in /usr/local (as evidenced by @INC error messages). Is there some other variable in addition to PERLLIB, like PERLHOME or something I need to set so that Perl won't look for anything in the /usr/local dirs? P

PHP 5.2 preg_match() compilation failure

由 你离开我真会死。 提交于 2019-12-07 06:24:28
问题 Would very much appreciate some help. My hosts server-side updates have caused my comment form to throw two validation errors. First one is: preg_match() returns Warning: preg_match() [function.preg-match]: Compilation failed: range out of order in character class at offset 13 in [script location here and line error] - second is on subject check at offset 14. It does this on the email address check: if (preg_match('/[^a-zA-Z0-9_-.]/', $_POST['txtEmail'])) and subject check: if (preg_match('/[

Trying to compile vim on OS X?

由 瘦欲@ 提交于 2019-12-07 05:15:34
问题 Following this writeup... The compiled binary seems to work fine, but the installed binary fails (when running make install ). It seems to be failing on this step: ... generating help tags /usr/local/bin/vim -u NONE -esX -c "helptags ++t ." -c quit dyld: Symbol not found: _environ Referenced from: /Users/neezer/.rvm/rubies/ruby-1.9.2-p0/lib/libruby.1.9.1.dylib Expected in: flat namespace in /Users/neezer/.rvm/rubies/ruby-1.9.2-p0/lib/libruby.1.9.1.dylib make[2]: *** [vimtags] Trace/BPT trap

Execution order of Enum in java

由 ℡╲_俬逩灬. 提交于 2019-12-07 04:59:03
问题 I got a question about Enum. I have an enum class looks like below public enum FontStyle { NORMAL("This font has normal style."), BOLD("This font has bold style."), ITALIC("This font has italic style."), UNDERLINE("This font has underline style."); private String description; FontStyle(String description) { this.description = description; } public String getDescription() { return this.description; } } I wonder when this Enum object is created. Enum looks like 'static final' Object since its
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