From 741774eafa572b76fcb9204560825dd47da7051a Mon Sep 17 00:00:00 2001
From: Trevor Gross <t.gross35@gmail.com>
Date: Mon, 10 Jul 2023 10:45:22 -0400
Subject: [PATCH] Update 'configureEngine.cmake' to not write to source dir
 (#2893)

It is currently not possible to do a full MariaDB build without touching the
source tree, i.e. such that the the source tree could exist on a read-only
filesystem. This columnstore build file currently creates temporary files in
the source tree to evaluate how the operating system handles them, so it is
one blocker to these isolated builds.

This patch adjusts these tests to create the temporary files in the output
directory, rather than in the source tree.

Signed-off-by: Trevor Gross <tmgross@umich.edu>
---
 cmake/configureEngine.cmake | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/cmake/configureEngine.cmake b/cmake/configureEngine.cmake
index 305f9f9a8..4de0f2946 100644
--- a/cmake/configureEngine.cmake
+++ b/cmake/configureEngine.cmake
@@ -314,9 +314,9 @@ int
 main ()
 {
 struct stat s, t;
-  return ! (stat (\"conftest.data\", &s) == 0
-        && utime (\"conftest.data\", 0) == 0
-        && stat (\"conftest.data\", &t) == 0
+  return ! (stat (\"${CMAKE_CURRENT_BINARY_DIR}/conftest.data\", &s) == 0
+        && utime (\"${CMAKE_CURRENT_BINARY_DIR}/conftest.data\", 0) == 0
+        && stat (\"${CMAKE_CURRENT_BINARY_DIR}/conftest.data\", &t) == 0
         && t.st_mtime >= s.st_mtime
         && t.st_mtime - s.st_mtime < 120);
   ;
@@ -453,7 +453,7 @@ EXECUTE_PROCESS(
     COMMAND rm -f conftest.sym conftest.file
     COMMAND touch conftest.file
     COMMAND ln -s conftest.file conftest.sym
-    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     )
 CHECK_CXX_SOURCE_RUNS(
 "
@@ -465,7 +465,7 @@ struct stat sbuf;
      /* Linux will dereference the symlink and fail, as required by POSIX.
     That is better in the sense that it means we will not
     have to compile and use the lstat wrapper.  */
-     return lstat (\"conftest.sym/\", &sbuf) == 0;
+     return lstat (\"${CMAKE_CURRENT_BINARY_DIR}/conftest.sym/\", &sbuf) == 0;
   ;
   return 0;
 }" LSTAT_FOLLOWS_SLASHED_SYMLINK)
@@ -718,7 +718,7 @@ ENDIF()
 
 EXECUTE_PROCESS(
     COMMAND rm -f conftest.data conftest.file conftest.sym
-    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     )
     
 CHECK_CXX_SOURCE_RUNS("