From 8d782adbce56d3e81dd361b5ef6e9ff781a6d436 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 29 Oct 2018 14:21:15 -0400
Subject: Flang: Fix command-line used to preprocess sources

Running flang with `-E` now ignores any `-o` option and always prints
preprocessed output to stdout.  Use shell redirection to place it in a
file instead.

Fixes: #18497
---
 Modules/Compiler/Flang-Fortran.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/Compiler/Flang-Fortran.cmake b/Modules/Compiler/Flang-Fortran.cmake
index a1051f4..d522739 100644
--- a/Modules/Compiler/Flang-Fortran.cmake
+++ b/Modules/Compiler/Flang-Fortran.cmake
@@ -2,7 +2,7 @@ include(Compiler/Clang)
 __compiler_clang(Fortran)
 
 set(CMAKE_Fortran_PREPROCESS_SOURCE
-    "<CMAKE_Fortran_COMPILER> -cpp <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> -o <PREPROCESSED_SOURCE>")
+    "<CMAKE_Fortran_COMPILER> -cpp <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
 
 set(CMAKE_Fortran_FORMAT_FIXED_FLAG "-ffixed-form")
 set(CMAKE_Fortran_FORMAT_FREE_FLAG "-ffree-form")
-- 
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