Questions tagged [compiler-specific]
47 questions
3
votes
1 answer
Is there a C compiler flag that allows case insensitivity?
I'm just wondering, is it possible to instruct GCC (or another compiler) that I dont want case-sensitivity in my C code?
If thats impossible, then another option would be to have a compiler-flag that throws an error when it finds two global…
Maestro
- 9,046
- 15
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2
votes
1 answer
How does GCC optimize this `switch`
Today I discovered that GCC does some amazing magic for optimizing switches in this code:
StairsType GetStairsType(uint8_t tileId, uint8_t dlvl)
{
if (dlvl == 0)
return StairsType::Part;
if (tileId == 48) {
return dlvl >= 21…
glebm
- 20,282
- 8
- 51
- 67
2
votes
0 answers
g++ generating the "complete object allocating constructor"
Is there a way(an argument) to make the g++ compiler to generate the "complete object allocating constructor"(C3) and the "deleting destructor"(D0)?
I loooked into this Why are C3 allocating constructors never used? , does not answer my question.
yonutix
- 1,964
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- 51
2
votes
0 answers
What features does threadsanitizer lack that are supported by helgrind, and vice-versa?
Performance aside, what features does gcc -fsanitize=thread lack that are supported by valgrind --tool=helgrind, and vice-versa? Is it platform-dependent?
Which detects the most critical errors? I would like to use only one if I can, since gcc…
vpostman
- 141
- 1
- 6
2
votes
1 answer
'Compiling' source files consisting of headers and cpp files into one huge cpp file
How can I get the compiler, or some other tool to spit out one huge source file with the headers included into their respective *.cpp files and then shove all those into one big *.cpp source file?
I have millions of lines of code and lots of mingled…
SolaGratia
- 309
- 4
- 18
2
votes
1 answer
Libc name and compilers
I apologize if the question is trivial, but I have googled around and downloaded the gcc source code too without finding a satisfactory answer.
So, how the compiler ( gcc/clang/etc... ) knows the file name of the libc? I know that unix-like systems…
pabloski
- 29
- 1
2
votes
0 answers
How to use Green Hills Multi IDE to compile Linux application
Green Hills MULTI 6.xx currently support 2 proprietary OSs, INTEGRITY and VelOSity as well as ThreadX (let's not call it an OS). Has anyone tried to use their compiler and libraries to compile apps for Linux? I went through their user manual and the…
user1906583
- 115
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- 9
1
vote
1 answer
Segmentation Fault on eraseFromParent() LLVM
bool runOnFunction(Function &F) override {
outs() << "Inside Function: "< work;
for(BasicBlock &BB : F)
for(Instruction &I : BB){
if(i == 15)
work.insert({i,…
Abilesh Sundarasamy
- 27
- 7
1
vote
0 answers
How to get a list of all the functions called in chronological order?
Is there a way to list all the functions called while executing a program in chronological order? Using the chronological list of invoked functions, order file can be generated. I can do this with program instrumentation…
A. K.
- 34,395
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1
vote
1 answer
What other compilers do I need to worry about struct packing?
In GCC, I need to use __attribute__((packed)) to make structs take the least amount of space, for example, if I have a large array of structs I should pack them. What other common compilers do struct padding, and how do I pack structs in these other…
user13874243
1
vote
1 answer
How a variable sized array in C work internally?
I am trying to understand how a variable sized static array work internally:
Following is a fixed size static array in C and its Assembly equivalent;
int main()
{
int arr[2] = {3};
}
================
main:
push rbp
mov rbp,…
Franc
- 319
- 9
- 28
1
vote
1 answer
How many object files can I pass to a linking task?
I found this for a vanilla case of Bash on GNU/Linux, but what about other shells, other operating systems and other compilers?
1737973
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1
vote
0 answers
On which compilers or with which compiler flags, pointer arithmetic rule violation may cause troubles?
The c++ standard constrains pointer arithmetic to be performed within an array ([expr.add]) which makes implementation of vector-like containers difficult.
One could implement a vector-like container with an implementation similar to this:
//First…
Oliv
- 17,610
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1
vote
0 answers
Why is MSVC compiler wierdly slower than gcc on Linux and Xcode C++ compiler on Mac
I couldn't figure out why the execution time for the following code snippet varies significantly on Windows(MSVC++)Virtual machine, Linux(GCC)virtual machine and Mac(xCode) physical machine.
#include
#include
#include…
artecher
- 339
- 3
- 8
1
vote
1 answer
Unlocking an already unlocked thread
In an already running old code, i have found a place where they were trying to unlock an already unlocked mutex.
I am clear that unlocking an already unlocked mutex will lead to undefined behaviour.
But my doubts are
Am I able to predict the…
kalai selvan
- 53
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