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Tag Archives: C Definitions
A convenient untruth
Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
Latest posts by Glennan Carnie (see all)
- Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
- Practice makes perfect, part 2– foundation kata - February 13, 2020
- Practice makes perfect, part 1 – Code kata - January 30, 2020
Array notation in C is a lie!
Sorry, dear reader*, but I cannot participate in this conspiracy any longer. You have been lied to, manipulated and coerced into thinking arrays are a construct of the C language. I feel it is my solemn duty to blow the whistle on this charade and expose the dirty secrets of C’s so-called arrays.
(* It is statistically possible that more than one person might read this, of
Weak linkage in C programming
Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.
Latest posts by Niall Cooling (see all)
- Navigating Memory in C++: A Guide to Using std::uintptr_t for Address Handling - February 22, 2024
- Embedded Expertise: Beyond Fixed-Size Integers; Exploring Fast and Least Types - January 15, 2024
- Disassembling a Cortex-M raw binary file with Ghidra - December 20, 2022
When linking C programs there are (in general) only a couple of errors you’re likely to see. If, for example, you have two functions in different files, both with external linkage, then the files will compile okay, but when you link you’ll likely see an error along these lines:
linking…
weak_linkage.axf: Error: L6200E: Symbol foo multiply defined (by foo.o and foo2.o).
Target not created
Most of the time this makes sense and is as expected; however there is a particular instance where it gets in the […]
The C build process
Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
Latest posts by Glennan Carnie (see all)
- Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
- Practice makes perfect, part 2– foundation kata - February 13, 2020
- Practice makes perfect, part 1 – Code kata - January 30, 2020
In this article we look at the C build process – that is, how we get from C source files to executable code, programmed on the target. It wasn’t so long ago this was common knowledge (the halcyon days of the hand-crafted make file!) but modern IDEs are making this knowledge ever-more arcane.
Compilation
The first stage of the build process is compilation.
The compiler is responsible for allocating memory for definitions (static and automatic) and generating opcodes from program statements. A relocatable […]
Posted in C/C++ Programming
Tagged build process, C Declarations, C Definitions, C90, C99, compiler, linker, pre-processor, Toolchain, translation unit
20 Comments
enum ; past, present and future
Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.
Latest posts by Niall Cooling (see all)
- Navigating Memory in C++: A Guide to Using std::uintptr_t for Address Handling - February 22, 2024
- Embedded Expertise: Beyond Fixed-Size Integers; Exploring Fast and Least Types - January 15, 2024
- Disassembling a Cortex-M raw binary file with Ghidra - December 20, 2022
The enumerated type (enum) is probably one of the simplest and most underused features of the C and C++ which can make code safer and more readable without compromising performance.
In this posting we shall look at the basic enum from C, how C++ improved on C’s enum, and how C++0X will make them a first class type.
Often I see headers filled with lists of #defines where an enum would be a much better choice. Here is a classic example:
/* adc.h […]
Declarations and Definitions in C
Director at Feabhas Limited
Co-Founder and Director of Feabhas since 1995.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.
Niall has been designing and programming embedded systems for over 30 years. He has worked in different sectors, including aerospace, telecomms, government and banking.
His current interest lie in IoT Security and Agile for Embedded Systems.
Latest posts by Niall Cooling (see all)
- Navigating Memory in C++: A Guide to Using std::uintptr_t for Address Handling - February 22, 2024
- Embedded Expertise: Beyond Fixed-Size Integers; Exploring Fast and Least Types - January 15, 2024
- Disassembling a Cortex-M raw binary file with Ghidra - December 20, 2022
Please Note: This post is focusing on pre-C99. The reason being is that it is aimed at the embedded C programmer who tends to be working with pre-C99 based cross-compilers. Also I have split it into two as it became my larger, due to feedback, than first anticipated.
On the surface declarations and definitions in C are pretty straight-forward; but once we start introducing the concepts of scope, storage-duration, linkage and namespace life is not so simple.
Program Objects (Variables)
Let’s start with […]
Posted in C/C++ Programming
Tagged C Declarations, C Definitions, C90, prototype declaration, tentative definiton
3 Comments