How can I create a function call in GIMPLE representation?
I'am trying to create a function call in Gimple.Since the documentation on this is so poor, I can't see how to proceed.In particular I would like to know how to build this function:uint32_t *m_addr =...
View ArticleAdvanced C and C++ compiling: unable to compile the example program mentioned...
I'm reading the book named "Advanced C and C++ compiling", by Milan StevanovicThe following is the snapshot from the book, followed by the problem I'm facing.Concept illustration: Demo ProjectThe...
View ArticleWhy does gcc -O3 handle avx256 compare intrinsic differently than gcc -O0 and...
I want to set two integer vectors and compare them with SIMD, and later on use this mask for a blend operation on packed floats. I produced the following code:#include <immintrin.h>#include...
View ArticleHow to get rid of Eclipse indexer "Type std::... could not be resolved"...
Steps to reproduce.Use Linux system where g++ defaults to standard older than c++17, but supports c++17 if given -std optionCreate trivial C++ project outside of Eclipse with main.cpp:#include...
View ArticleSon of GCC conversion warning when assigning to a bitfield
I am trying to solve almost the exact same problem as GCC conversion warning when assigning to a bitfield except none of the solutions appear to work. As with the linked problem, gcc version does not...
View ArticleHow to make lcov perform faster?
I'm having performance issues with lcov.I'm executing a program in seven different profiles, collecting the coverage for each of them and then merging the coverage profile with lcov: lcov --rc...
View ArticleVisual Studio 2017 CMake linking error (undefined reference to)
I'm working on a cross platform c++ application (windows & Linux). I'm using VS 2017 professional as my IDE and Cmake as my build tool. Code contains both c & c++ files. Currently I'm able to...
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How to override the entrypoint like __libc_start_main with g++
We want to inject some functions before user's main function and found LD_PRELOAD to override __libc_start_main would work for C programes with gcc.However, it doesn't work with cpp file which may use...
View ArticleCompiling multiple C files with gcc
I have two files, main.o and modules.o, and I'm trying to compile them so that main.o can call functions in modules.o. I was explicitly told not to try #include module.o. I really don't know what I...
View ArticleWhy does using initialisation list in class constructor generated a...
I was working on a personal project with classes and didn't wanted to initialling each of the data members. So I made a call to *((Classname *)(this)) = {}; in the constructor. Hoping that it would...
View ArticleSet the default GCC to Xcode Command Line Tools
How can I ensure that gcc points to a particular compiler? Can I make a permanent symbolic link to the xcode version of gcc?I have several versions of the gcc compiler installed on my system, including...
View Articlebinary hardening with -fstack-protector-all not reflecting
I applied the flag -fstack-protector-all while compiling a binary but it not reflecting in the final executable. I checked it with this script. It shows No canary found. My code has the static char...
View ArticleIs there a way to force gcc to start a new stack frame for a block?
In embedded C++ code where RAM and hence stack space is limited, I often come across this situation:void f(parameters) { if (condition) g(...); // g uses lots of stack space else { int table[1000]; //...
View ArticleC nested function and promises
For a project I am working on I would like to use GCC nested functions because I would like to have a sort of lambda:I am not interested in supporting other compilersI don't want to access variables...
View Articleld:library not found gcc for -lcrt0.o
I am new on using mac os I tried to compile my c code after installing gcc using brew tool and then when I run on terminal :gcc -static -O3 javaLauncher.c -o javaLauncher I got that error ld :library...
View Articlegcc compilation with dark moon cygwin
I am learning to use bash on Windows, I installed dark moon cygwin and I want to compile "old code" with gcc on windows. I can compile my code and run it in dark moon, but when I put it on another...
View ArticleIn C++ can we dereference this pointer? If so then how and if not then why?
I was working on a personal project with classes and didn't wanted to initialling each of the data members. So I made a call to *((Classname *)(this)) = {}; in the constructor. Hoping that it would...
View ArticleIs passing around a GCC nested function valid? If not, are what alternatives...
For a project I am working on I would like to use GCC nested functions because I would like to have a sort of lambda:I am not interested in supporting other compilersI don't want to access variables...
View ArticleC++ program compiled without problems but doesn't run
There is my code. It does compile without any errors, but it doesn't output anything. When I open program.exe it instantly is closed even if I add "cin.get()" at the end of program. When used in...
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Redundant register values in GCC-compiled binary? [duplicate]
Alright, so I'm trying to learn reverse engineering and x64 assembly. As an example I wrote this little test program in C:#include <stdio.h>int square(int num) { return num * num;}int main() {...
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