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LLVMFlang: Fix post-preprocess compile for fixed-form Fortran

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LLVM Flang's preprocessor output is always valid fixed form Fortran with
a fixed line length of 72. If an application tries to use fixed form
with a different line length, this will fail in the
post-preprocessing compilation step as they will pass a flag asking for
a different fixed line length.

To fix this we can pass -ffixed-line-length-72 to the post-preprocess
compilation stage. This will be ignored when the input is free form
Fortran, and force to a 72 line length when the input is fixed.
This commit is contained in:
David Truby
2023-02-14 13:55:03 +00:00
committed by Brad King
parent d18dd364d3
commit 3f1e58c5b9
1 changed files with 1 additions and 0 deletions
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Modules/Compiler/LLVMFlang-Fortran.cmake
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@@ -13,3 +13,4 @@ set(CMAKE_Fortran_MODDIR_FLAG "-module-dir")
set(CMAKE_Fortran_COMPILE_OPTIONS_PREPROCESS_ON "-cpp")
set(CMAKE_Fortran_COMPILE_OPTIONS_PREPROCESS_OFF "-nocpp")
set(CMAKE_Fortran_POSTPROCESS_FLAG "-ffixed-line-length-72")