| Issue |
132059
|
| Summary |
small mistake in -fmodule-file description breaks clang++-19 frontend with -fstack-protector
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
igormcoelho
|
I was experimenting CXX Modules with Clang 19 on Ubuntu, and it suddently broke when I passed wrong parameters on -fmodule-file, but strangely this only occurred when -fstack-protector was enabled... I have no idea why.
This is the clang version:
```
$ clang++-19 --version
Ubuntu clang version 19.1.1 (1ubuntu1~24.04.2)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-19/bin
```
The files are:
```
// main.cc
import hello;
import std;
int main() {
do_hello("world");
return 0;
}
```
```
// hello.cppm
export module hello;
import std;
export inline void do_hello(std::string_view const &name)
{
std::cout << "Hello " << name << "!\n";
}
```
First I compile both .pcm files:
```
clang++-19 -std=c++23 -stdlib=libc++ -U_FORTIFY_SOURCE -fstack-protector -Wall -Wthread-safety -Wself-assign -Wunused-but-set-parameter -Wno-free-nonheap-object -fcolor-diagnostics -fno-omit-frame-pointer '-std=c++23' -fPIC -Wno-reserved-identifier -Wno-reserved-module-identifier --precompile -o std.pcm /usr/lib/llvm-19/share/libc++/v1/std.cppm
clang++-19 -std=c++23 -stdlib=libc++ -U_FORTIFY_SOURCE -fstack-protector -Wall -Wthread-safety -Wself-assign -Wunused-but-set-parameter -Wno-free-nonheap-object -fcolor-diagnostics -fno-omit-frame-pointer '-std=c++23' -fPIC -fmodule-file=std=std.pcm -Wno-reserved-identifier -Wno-reserved-module-identifier --precompile -o hello.pcm hello.cppm std.pcm
clang++-19 -std=c++23 -stdlib=libc++ -U_FORTIFY_SOURCE -fstack-protector -Wall -Wthread-safety -Wself-assign -Wunused-but-set-parameter -Wno-free-nonheap-object -fcolor-diagnostics -fno-omit-frame-pointer '-std=c++23' -fPIC -fmodule-file=std=std.pcm -fmodule-file=hello=hello.pcm -o hello_world std.pcm hello.pcm main.cc
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