From 15da0ba3a2a9e637f5de69b4ea49c55916a2dedb Mon Sep 17 00:00:00 2001
From: Christian Pfeiffer <cpfeiffer@live.de>
Date: Tue, 24 Oct 2017 16:48:33 +0200
Subject: Find{OpenMP,OpenACC}: Fix detection with -Werror=return-type

Explicitly return a value from `main` in our test sources.

Fixes: #17391
---
 Modules/FindOpenACC.cmake | 9 +++++++--
 Modules/FindOpenMP.cmake  | 5 ++++-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/Modules/FindOpenACC.cmake b/Modules/FindOpenACC.cmake
index 775cc18..dc8321d 100644
--- a/Modules/FindOpenACC.cmake
+++ b/Modules/FindOpenACC.cmake
@@ -49,7 +49,9 @@ be returned with OpenACC_<lang>_FLAGS.
 set(OpenACC_C_CXX_TEST_SOURCE
 "
 int main(){
-#ifndef _OPENACC
+#ifdef _OPENACC
+  return 0;
+#else
   breaks_on_purpose
 #endif
 }
@@ -58,7 +60,9 @@ int main(){
 set(OpenACC_Fortran_TEST_SOURCE
 "
 program test
-#ifndef _OPENACC
+#ifdef _OPENACC
+  return 0;
+#else
   breaks_on_purpose
 #endif
 endprogram test
@@ -79,6 +83,7 @@ const char accver_str[] = { 'I', 'N', 'F', 'O', ':', 'O', 'p', 'e', 'n', 'A',
 int main()
 {
   puts(accver_str);
+  return 0;
 }
 ")
 set(OpenACC_Fortran_CHECK_VERSION_SOURCE
diff --git a/Modules/FindOpenMP.cmake b/Modules/FindOpenMP.cmake
index 272f4dc..5535b9d 100644
--- a/Modules/FindOpenMP.cmake
+++ b/Modules/FindOpenMP.cmake
@@ -123,7 +123,9 @@ set(OpenMP_C_CXX_TEST_SOURCE
 "
 #include <omp.h>
 int main() {
-#ifndef _OPENMP
+#ifdef _OPENMP
+  return 0;
+#else
   breaks_on_purpose
 #endif
 }
@@ -248,6 +250,7 @@ const char ompver_str[] = { 'I', 'N', 'F', 'O', ':', 'O', 'p', 'e', 'n', 'M',
 int main()
 {
   puts(ompver_str);
+  return 0;
 }
 ")
 
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