11,831 questions
Advice
0
votes
2
replies
24
views
clang-tidy, after a custom replacement I wrote, how to re-parse the text
I'm currently writing a clang-tidy check for a particular monadic replacement for c++. Think of it something like, for particular types and notations, f(x) becomes x(f) - this, of course, requires an ...
- 10.9k
-2
votes
2
answers
80
views
Change in module behavior for clang in GitHub
I've inherited a GitHub job I don't understand well and that has stopped compiling.
It creates a .a library for iOS.
The source consists of a set of modules, each declared thus:
export module x;
...
3
votes
1
answer
120
views
std::filesystem::path::parent_path() GCC vs Clang behavior with multiple leading separators
I stumbled upon different behavior of std::filesystem::path::parent_path() when a path contains leading slashes. Clang says that the parent of ///a is /// (which is what I would expect), but GCC says ...
- 705
5
votes
2
answers
330
views
clangd in CUDA mode treats host-side C++ standard library as unavailable (std::format, chrono, iostream errors)
Problem
I'm trying to use clangd for LSP in Neovim with CUDA .cu files, but it fails to recognize standard C++ library features on the host side. Even simple host functions using std::format, std::...
- 314
3
votes
2
answers
190
views
Why do GCC and Clang fail to auto-vectorize simple loop?
I have two functions counting the occurrences of a target char in the given input buffer. The functions vary only in how they communicate the result back to the caller; one returns the result and the ...
- 193
Tooling
0
votes
5
replies
96
views
A Clang tool to add extra line of code whenever a #define is true
I want to develop a tool that helps in transforming a code like this:
#ifdef MYLIB_ENABLE_DEPRECATED_CODE
... some deprecated code ...
#endif
into:
#ifdef MYLIB_ENABLE_DEPRECATED_CODE
...
- 1,985
0
votes
1
answer
45
views
mingw clang not generating .pdb file correctly
I'm compiling my program with -g -gcodeview to create the .pdb file info. It does.
I'm also linking with: -g -Wl,--pdb= -lDbgHelp
However, I get the following and the .pdb file is small - a few Kb.
...
- 3,156
2
votes
1
answer
115
views
C macro compilation fails in Clang with "expected ;" due to phantom comma in clang -E expansion
I wrote my "Result" macro header, using C23 and some of the newest features:
#pragma once
#include <stdio.h>
#include <stdlib.h>
#define __RESULT_EAT_PARENS(...) __VA_ARGS__
...
- 23
0
votes
1
answer
35
views
Custom LLVM backend: error: unable to interface with target machine
Background
I am writing a custom, globalISel only, backend for a currently unsupported processor. I have progressed to the point where I can run
> clang -target xxx -emit-llvm file.c
> llc -...
0
votes
0
answers
78
views
How to override the -fuse-ld flag in CLion?
I have a CMake based Windows library project that only links successfully with the MSVC link.exe due to some obscure third party library dependencies. However, I want to compile the project using the ...
- 2,020
2
votes
1
answer
143
views
Clangd query driver still uses clang source dir
Recently i've been working on some project with GNU arm compiler for C++ project. I've configured clangd to use this compiler with query-driver as clangd documentation recommends. The problem is ...
- 107
3
votes
0
answers
180
views
What is causing multi single-Byte access to packed Bit-field on GCC as opposed to single double word access on Clang?
While investigating some spurious tests in a x86-64Bit Yocto-based Linux system, that there were multi Byte writes to a register of a PCIe card, instead of an expected single double word write.
A ...
- 101
2
votes
1
answer
182
views
Show compiler's estimate of branch/block probabilities
How can I get clang or compiler explorer to emit information about its internal calculated branch probabilities for a snippet of C++ code?
It's OK if it's in IR at some optimization pass and not in ...
- 66.3k
0
votes
2
answers
155
views
Any Clang diagnostic flag for preventing casting an invalid int value to an enum in C?
Clang's -Wassign-enum diagnostic flag will trigger a warning when using an int whose value is out of scope of an enum's cases:
typedef enum Foo {
FooA,
FooB,
} Foo;
void handleFoo(Foo foo);
...
- 17.6k
1
vote
1
answer
52
views
How can I correlate a clang::CXXMethodDecl with documentation comments that are in the header?
I am learning to work with the clang AST while developing a refactoring tool.
I'm using a clang::ast_matchers::dynamic::DynTypedMatcher created using the clang::ast_matchers::dynamic::Parser::...
- 13