[flang] Implement C_F_STRPOINTER (Fortran 2023) (#176973) Implement C_F_STRPOINTER to associate a Fortran character pointer with a C string. This intrinsic has two forms: C_F_STRPOINTER(CSTRARRAY, FSTRPTR [,NCHARS]): Associates FSTRPTR with a C string array C_F_STRPOINTER(CSTRPTR, FSTRPTR, NCHARS): Associates FSTRPTR with a C_PTR pointing to a character string Implementation includes semantic validation, FIR lowering, and associated tests. F2023 Standard: 18.2.3.5 AI Usage Disclosure: AI tools (Claude Sonnet 4.5) were used to assist with implementation of this feature and test code generation. I have reviewed, modified, and tested all AI-generated code. GitOrigin-RevId: 4b109dc5ac0b53d3c459c25324c41ae1e8a4583b
Flang is a ground-up implementation of a Fortran front end written in modern C++. It started off as the f18 project (https://github.com/flang-compiler/f18) with an aim to replace the previous flang project (https://github.com/flang-compiler/flang) and address its various deficiencies. F18 was subsequently accepted into the LLVM project and rechristened as Flang.
Please note that flang is not ready yet for production usage.
Read more about flang in the docs directory. Start with the compiler overview.
To better understand Fortran as a language and the specific grammar accepted by flang, read Fortran For C Programmers and flang's specifications of the Fortran grammar and the OpenMP grammar.
Treatment of language extensions is covered in this document.
To understand the compilers handling of intrinsics, see the discussion of intrinsics.
To understand how a flang program communicates with libraries at runtime, see the discussion of runtime descriptors.
If you're interested in contributing to the compiler, read the style guide and also review how flang uses modern C++ features.
If you are interested in writing new documentation, follow LLVM's Markdown style guide.
Consult the Getting Started with Flang for information on building and running flang.