[all-commits] [llvm/llvm-project] 8d5386: [flang] Generate main only when a Fortran program ...

[David Truby via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8d5386669ed63548daf1bee415596582d6d78d7d
      https://github.com/llvm/llvm-project/commit/8d5386669ed63548daf1bee415596582d6d78d7d
  Author: David Truby <david.truby at arm.com>
  Date:   2024-04-29 (Mon, 29 Apr 2024)

  Changed paths:
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChains/CommonArgs.cpp
    M clang/lib/Driver/ToolChains/Flang.cpp
    M flang/docs/FlangDriver.md
    M flang/include/flang/Optimizer/Builder/Runtime/EnvironmentDefaults.h
    A flang/include/flang/Optimizer/Builder/Runtime/Main.h
    M flang/lib/Lower/Bridge.cpp
    M flang/lib/Optimizer/Builder/CMakeLists.txt
    M flang/lib/Optimizer/Builder/Runtime/EnvironmentDefaults.cpp
    A flang/lib/Optimizer/Builder/Runtime/Main.cpp
    M flang/runtime/CMakeLists.txt
    R flang/runtime/FortranMain/CMakeLists.txt
    R flang/runtime/FortranMain/Fortran_main.c
    M flang/test/CMakeLists.txt
    A flang/test/Driver/driver-help-hidden.f90
    M flang/test/Driver/dynamic-linker.f90
    M flang/test/Driver/emit-mlir.f90
    M flang/test/Driver/linker-flags.f90
    M flang/test/Driver/msvc-dependent-lib-flags.f90
    M flang/test/Driver/no-duplicate-main.f90
    M flang/tools/flang-driver/CMakeLists.txt
    M lld/COFF/MinGW.cpp

  Log Message:
  -----------
  [flang] Generate main only when a Fortran program statement is present (#89938)

This patch changes the behaviour for flang to only create and link to a
`main` entry point when the Fortran code has a program statement in it.

This means that flang-new can be used to link even when the program is
a mixed C/Fortran code with `main` present in C and no entry point
present in Fortran.

This also removes the `-fno-fortran-main` flag as this no longer has any
functionality.



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