Weak symbols are a feature in programming languages like C and C++ that allow for the definition of symbols that can be overridden by other definitions. The syntax for annotating weak symbols can vary between different compilers. Here are some of the compilers that share similar syntax for weak symbols:
GCC (GNU Compiler Collection): GCC uses the __attribute__((weak)) syntax to declare weak symbols. For example:
void my_function() __attribute__((weak));
Clang: Clang, which is based on LLVM, also supports the same __attribute__((weak)) syntax as GCC. This means that code written for GCC can often be compiled with Clang without modification.
MSVC (Microsoft Visual C++): While MSVC does not use the same syntax as GCC and Clang, it does support weak symbols through the use of __declspec(selectany). However, the behavior and implementation details may differ.
Intel C++ Compiler: The Intel C++ Compiler also supports the __attribute__((weak)) syntax, making it compatible with GCC and Clang in this regard.
ARM Compiler: The ARM Compiler supports weak symbols using the same __attribute__((weak)) syntax, allowing for similar usage as in GCC.
In summary, GCC, Clang, Intel C++ Compiler, and ARM Compiler share the same syntax for annotating weak symbols using __attribute__((weak)). MSVC has a different approach but can achieve similar functionality.