[all-commits] [llvm/llvm-project] a96b46: [flang] Lower BIND(C) module variables (#78279)

[jeanPerier via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a96b4671b97b167230986bd2811676064c608596
      https://github.com/llvm/llvm-project/commit/a96b4671b97b167230986bd2811676064c608596
  Author: jeanPerier <jperier at nvidia.com>
  Date:   2024-01-17 (Wed, 17 Jan 2024)

  Changed paths:
    M flang/lib/Lower/ConvertVariable.cpp
    A flang/test/Lower/HLFIR/bindc-module-var.f90

  Log Message:
  -----------
  [flang] Lower BIND(C) module variables (#78279)

Lower initialized BIND(C) module variable as regular module variable,
except that the fir.global symbol name is the binding label.

For uninitialized variables, add the common linkage so that C code may
define the variables. The standard does not provide a way to indicate
that a variable is defined in C, but there are use cases.

Beware that if the module file compiled object is added to a shared
library, the variable will become a regular global definition and may
override the C variable depending on the linking order.