Can a fast interrupt handler call a non-fast-interrupt-handler function?
If I have a fast interrupt handler (by adding __attribute__((interrupt("FIQ")))), can I invoke other non-fast-interrupt function inside the handler? For example,void f() {//...} void g() {//...} void...
View Articlegcc error: asm/linkage.h: No such file or directory
im trying to compile a c program on ubuntu virtual machine, and when i run gcc sniff.c -o sniff(sniff.c is the name of my program) it shows me the error : asm/linkage.h: no such file or directory. I'v...
View Articlegcc -W -Wall -O -pedantic -std=c99 vs clang with same options
Trying to output a pointer's address in decimal form using the %zu conversion specifier. Runs okay as expected except that GCC warnsformat ‘%zu’ expects type ‘size_t’, but argument 4 has type ‘long int...
View ArticleWhy cast zero to pointer type and access its member work?
Recently, I saw something cool.#define container_of(ptr, type, member) ({ \ const typeof( ((type *)0)->member ) *__mptr = (ptr); \ (type *)( (char *)__mptr - offsetof(type,member) );}) Basically, I...
View ArticleHow to have inline functions in multiple files
My project has the following 4 files: main.c, rcm.h, rcm.c and queue.c.In rcm.h I'm declaring all functions implemented in rcm.c and queue.c.rcm.c looks like:#include "rcm.h" void rcm (void) { Queue *Q...
View ArticleWhy doesn't this compiler barrier enforce ordering?
I was looking at the documentation on the Atmel website and I came across this example where they explain some issues with reordering.Here's the example code:#define cli() __asm volatile( "cli" :::...
View ArticleWhat files can be safely deleted from the MinGW-w64 binaries?
I am using the MinGW-w64 installer found here:https://mingw-w64.org/doku.php/download/mingw-buildsInstalling to a directory creates a folder called mingw32 or mingw64 that contains the compiler. I...
View ArticleWhat is lto1.exe?
when you inspect mingw you will find the c compiler cc1.exe (funny growing in size in 9.2 it is almost 25 MB ) cc1plus.exe is c++ compiler (same sizes) collect2.exe is linker (afiak) nut what is...
View ArticleWhy do we need the DWARF eh_frame emitted by compilers?
I have red that eh_frame is needed for stack unwinding during debugging or when our code hits an exception.Now my questions is, can't the debugger just walk the stack and figure out the boundaries...
View ArticleHow to edit a number which is at a specific location in a given file in C?
I have saved a list of number as 1 2 3 4 5 6 7 8 9 10 in the file INPUT.txt. and I want to edit a specific location (which is the 5th element here) and want to replace it by number 35. How can I do...
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Format specifer in C++
I'am trying to understand a C++ compiler behaviour. Here is a code, where I made two mistakes intentionally:forgot %ld format specifier in scanf and just wrote %.added unknown format specifer for...
View ArticleHow to downgrade GCC in windows Ubuntu?
I been trying to downgrade my Windows Ubuntu GCC compiler and what I've done so far issudo apt-get updatesudo apt-get install gccgcc --version which gives me: gcc 7.4.0sudo apt-get install gcc-4.6...
View Articlexcode installed but cannot find macOS_SDK_headers_for_macOS_10.14.pkg
I have an issue with compiling gcc which can be traced back to Catalina having issues with xcode, so I referred to the link here "macOS_SDK_headers_for_macOS_10.14.pkg is incompatible with this version...
View ArticleWhy doesn't gcc link an SDL 2.0 C project? (macOS) [duplicate]
I wrote a simple Chip-8 emulator in C (mostly taking inspiration from this; to be honest, just rewriting it in C). It uses SDL 2.0, which I definitely have installed.As I tried compiling the files (gcc...
View ArticleHow to change GCC's default sysroot?
If you run gcc -print-sysroot it will print out the location default sysroot. This also works for cross compilers, for example:docker_user@8d9f484fffc7:/build_env$...
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Variable type matching problem with Eigen
I am using Eigen on google cloud platform on an ubuntu machine. I have installed gcc-7 and I am trying to run a C++ code containing a huge matrix (1000X1000) of doubles. The code is running fine on...
View ArticlePerformance of dynamically sized arrays MSVC vs GCC [duplicate]
Today a little argument erupted over the following code line in a fairly time-critical piece of C++ that was running.void func(std::string& str) { ... uint8_t buffer[str.size() + 10]; ... } Now...
View ArticlePerformance with dynamically sized arrays in C++ MSVC vs GCC [duplicate]
Today a little argument erupted over the following code line in a fairly time critical piece of C++ that was running.void func(std::string& str) { ... uint8_t buffer[str.size() + 10]; ... } Now...
View ArticleCentos7 g++ "to_string is not in a member of std"
I have some pretty standard C++ code, in which I am using to_string to add a sting and an int together, like this:#include <string> using namespace std; class Color{ public: int red, blue, green;...
View ArticleStack Frame not correct with GCC and STM32
I am trying to create simple SVC Handler in GNU GCC (Not ARM GCC). If SVC service is called, it enters SVC_Handler() correctly, but when I try to find the SVC number used to call SVC Handler...
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