0001-FortranCInterface-Fix-broken-search-for-test-exe-whe.patch

From 0fc7b9df1c3b6515395bf646deffb25e91cb415b Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 27 Feb 2020 11:04:20 -0500
Subject: [PATCH] FortranCInterface: Fix broken search for test exe when
 cross-compiling

Previously the `find_program` call we used to locate the test executable
but that can be broken by `CMAKE_FIND_ROOT_PATH_MODE_PROGRAM`.  Instead
teach the test project to write a file with the location of the
executable it builds.  Load that file to get the exact location.

Fixes: #20390
---
 Modules/FortranCInterface/CMakeLists.txt |  4 ++++
 Modules/FortranCInterface/Detect.cmake   | 10 ++--------
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/Modules/FortranCInterface/CMakeLists.txt b/Modules/FortranCInterface/CMakeLists.txt
index e3b81d7..71bd3ad 100644
--- a/Modules/FortranCInterface/CMakeLists.txt
+++ b/Modules/FortranCInterface/CMakeLists.txt
@@ -102,3 +102,7 @@ set_property(TARGET symbols PROPERTY POSITION_INDEPENDENT_CODE 1)
 # Require symbols through Fortran.
 add_executable(FortranCInterface main.F call_sub.f ${call_mod})
 target_link_libraries(FortranCInterface PUBLIC symbols)
+
+file(GENERATE OUTPUT exe-$<CONFIG>.cmake CONTENT [[
+set(FortranCInterface_EXE "$<TARGET_FILE:FortranCInterface>")
+]])
diff --git a/Modules/FortranCInterface/Detect.cmake b/Modules/FortranCInterface/Detect.cmake
index 7789785..1431dd8 100644
--- a/Modules/FortranCInterface/Detect.cmake
+++ b/Modules/FortranCInterface/Detect.cmake
@@ -43,17 +43,11 @@ set(FortranCInterface_COMPILED ${FortranCInterface_COMPILED})
 unset(FortranCInterface_COMPILED CACHE)
 
 # Locate the sample project executable.
+set(FortranCInterface_EXE)
 if(FortranCInterface_COMPILED)
-  find_program(FortranCInterface_EXE
-    NAMES FortranCInterface${CMAKE_EXECUTABLE_SUFFIX}
-    PATHS ${FortranCInterface_BINARY_DIR} ${FortranCInterface_BINARY_DIR}/Release
-    NO_DEFAULT_PATH
-    )
-  set(FortranCInterface_EXE ${FortranCInterface_EXE})
-  unset(FortranCInterface_EXE CACHE)
+  include(${FortranCInterface_BINARY_DIR}/exe-Release.cmake OPTIONAL)
 else()
   set(_result "Failed to compile")
-  set(FortranCInterface_EXE)
   file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
     "Fortran/C interface test project failed with the following output:\n"
     "${FortranCInterface_OUTPUT}\n")