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Many programmers know firsthand that C and C++ program builds very long. Someone solves this problem by sword-fighting at build time, someone is going to the kitchen to "grab some coffee". This article is for those who are tired of this, and who decided it is time to do something about it. In this article, various ways of speeding up compilation time of a project are regarded, as well as treatment of a disease "fixed one header - a half of a project was rebuilt."
Before we start, let's find out/recall the main phases of the translation of C/C++ code into an executable program.
According to p. 188.8.131.52 (http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1548.pdf) of the draft N1548 "Programming languages — C" and p.5.2 (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4659.pdf) N4659 "Working Draft, Standard for Programming Language C++"(published versions of the standards can be purchased here (https://www.iso.org/standard/57853.html) and here (https://www.iso.org/standard/68564.html), 8 and 9 translation phases are defined respectively. Let's leave out the details and consider the translating process in the abstract:
- Phase I - the source file arrives at the input preprocessor. Preprocessor makes content substitution of the specified in the #include files and expands macros. It corresponds to the phases 1 - 4 of the C11 and C++17 drafts.
- Phase II - the preprocessed file arrives at the compiler and gets converted to an object file. It corresponds to the phases 5 - 7 of the C11 draft and 5 - 8 of the C++17 draft.
- Phase III - a linker links object files and provides static libraries, forming an executable program. It corresponds to the phases 8 - 9 of the C11 and C++17 drafts respectively.
The program is compound of translation units (*.c, *.cc, *.cpp, *.cxx), each is self-sufficient and can be preproccessed/compiled independently from the other. It also follows that each translation unit has no information about the other units. If the two units have to exchange any information (such as a function), this is solved by linking by name: the external entity is declared with the keyword extern, and at the phase III the linker links them. A simple example:
int64_t abs(int64_t num)
return num >= 0 ? num : -num;
extern int64_t abs(int64_t num);
To simplify the harmonization of different translation units, a header files mechanism was figured out, which is a declaration of clear interface. Subsequently, each translation unit in case of need includes the header file through the #include preprocessor directive.
Next, let's look at how you can speed up the build at different phases. In addition to the principle itself, it will also be helpful to describe how to implement this or that way in the build system. The examples will be given to the following build systems: MSBuild, Make, CMake.
Read more - https://www.viva64.com/en/b/0549/
Firebird, MySQL, and PostgreSQL are probably the most famous representatives of DBMS. Naturally, these projects often are compared with each other - by functionality, usability, etc. We have decided to perform our own code quality comparison of these projects.
The article gives a review of bugs, detected using PVS-Studio static code analyzer. A 'direct' approach of comparing by the number of warnings in this case is badly applicable, so you have to find other ways to compare. For example, you can analyze projects for potential vulnerabilities, as well as to see which of the most interesting errors will be found. By undertaking such a review, you can estimate, which code is better, and find out who will emerge victorious from this battle.
Read more - https://www.viva64.com/en/b/0542/
Honestly I warn: take this text with a certain amount of skepticism. I just recently started to get acquainted with the internals of PHP, but I would like to tell you about what is happening behind the scenes bug # 75237 .
Is the rabbit hole deep?
How many minutes do you need to understand what the chip is?
Francis Bacon in 1620 divided the sources of human error in the way of cognition into four groups, which he called "ghosts" or "idols" (Latin idola).
"Ghosts of the genus" stem from human nature itself, they do not depend on either culture or individuality of a person. "The human mind is like an uneven mirror, which, mixing the nature of things, reflects things in a distorted and disfigured form."
"Ghosts of a cave" are individual errors of perception, both congenital and acquired. "After all, in addition to the mistakes inherent in the human race, there is a special cave that weakens and distorts the light of nature."
"The ghosts of the square (market)" - a consequence of the social nature of man, - communication and use of language in communication. "People unite with speech. Words are established according to the understanding of the crowd. Therefore, the bad and ridiculous establishment of words surprisingly precipitates the mind. "
"Ghosts of the theater" - this is a person's assimilated from other people false ideas about the structure of reality. "At the same time, we understand here not only the general philosophical teachings, but also the numerous principles and axioms of sciences that have gained strength due to tradition, faith and carelessness." [ Wikipedia ]
Under the cut - a visual demonstration of the vulnerability of our brains to attacks through visual input. I present to you the translation of the article of the product designer and front-end developer Balraj Chana, about how you can use / neutralize the effect of optical illusions.
The inspiration for writing this article was obtained after reading a similar publication for the x86 architecture .
This material will help those who want to understand how the programs are built from the inside, what happens before entering the main and why all this is done. Also I'll show you how to use some of the features of the glibc library. And in the end, as in the original article , the traversed path will be visually represented. Most of the article is a parsing of the glibc library.
So, let's start our trip. We will use Linux x86-64, and as a debugging tool - lldb. Also sometimes we will disassemble the program with objdump.
The source text is normal Hello, world (hello.cpp):
std::cout << "Hello, world!" << std::endl;
Something is happening. People are unhappy. The specter of civil unrest is pursued by our programming communities.
For the first time a significant number of web developers openly question the web platform. Here is a typical article and discussion of . I could list more, but if you are sufficiently interested in programming to read this article, you probably already read this year at least one pompous recitation about the current state of web development. This article is not one of those. I can not compete in bullying the existing status quo with people who have to deal with web development every day. This is another article.
It's you, the front end hacker