In a GCC compiled project, How do I run CMake for each target type (debug/release)? How do I specify debug and release C/C++ flags using CMake? How do I express that the main executable will be compiled with g++ and one nested library with gcc? 6 s 6
How do I convert a char to an int in C and C++? 13 s 13 Depends on what you want to do: to read the value as an ascii code, you can write char a=”a”; int ia = (int)a; /* note that the int cast is not necessary — int ia = a would … Read more
How do I list the symbols being exported from a .so file? If possible, I’d also like to know their source (e.g. if they are pulled in from a static library). I’m using gcc 4.0.2, if that makes a difference. 1Best Answer 11 The standard tool for listing symbols is nm, you can use it … Read more
I am working on Linux with the GCC compiler. When my C++ program crashes I would like it to automatically generate a stacktrace. My program is being run by many different users and it also runs on Linux, Windows and Macintosh (all versions are compiled using gcc). I would like my program to be able … Read more
Here is the extract from the program in question. The matrix img[][] has the size SIZE×SIZE, and is initialized at: img[j][i] = 2 * j + i Then, you make a matrix res[][], and each field in here is made to be the average of the 9 fields around it in the img matrix. The … Read more
What is the difference between g++ and gcc? Which one of them should be used for general c++ development? 10 s 10
Why does the C preprocessor in GCC interpret the word linux (small letters) as the constant 1? test.c: #include <stdio.h> int main(void) { int linux = 5; return 0; } Result of $ gcc -E test.c (stop after the preprocessing stage): …. int main(void) { int 1 = 5; return 0; } Which of course … Read more
We are compiling an embedded C++ application that is deployed in a shielded device in an environment bombarded with ionizing radiation. We are using GCC and cross-compiling for ARM. When deployed, our application generates some erroneous data and crashes more often than we would like. The hardware is designed for this environment, and our application … Read more
I am doing some numerical optimization on a scientific application. One thing I noticed is that GCC will optimize the call pow(a,2) by compiling it into a*a, but the call pow(a,6) is not optimized and will actually call the library function pow, which greatly slows down the performance. (In contrast, Intel C++ Compiler, executable icc, … Read more
I am trying to build a shared library using a C extension file but first I have to generate the output file using the command below: gcc -Wall utilsmodule.c -o Utilc After executing the command, I get this error message: > utilsmodule.c:1:20: fatal error: Python.h: No such file or directory compilation terminated. I have tried … Read more
