run_tests.sh: update comment on -j option, add run_tests.bat

run_tests.bat

@@ -0,0 +1,34 @@
+:: Run all tests registered with CMake using ctest.
+
+@echo off
+setlocal
+
+call :Main %*
+exit /b %ERRORLEVEL%
+
+::::
+:: Collect command-line arguments.
+::
+:: Arguments:
+::  Array of command-line arguments
+:CollectArgs
+exit /b 0
+
+::::
+:: Main method for the script.
+::
+:: Note: In CMD GTEST_COLOR does not work with ctest. However, color output is
+:: still produced if the Google Test runner is executed directly.
+::
+:: Arguments:
+::  Array of command-line arguments
+::
+:Main
+:: use half the number of processors. only final -j<n_procs> takes effect.
+set /a N_PROCS=%NUMBER_OF_PROCESSORS% / 2
+ctest --test-dir build_windows -j%N_PROCS% %*
+copy a b
+exit /b %ERRORLEVEL%
+
+endlocal
+echo on

run_tests.sh

@@ -8,8 +8,8 @@
 main() {
     # GTEST_COLOR=yes allows color output from Google test mains. the nested
     # command substitution gets half the number of available threads on system.
-    # note that -j x can be overridden with a subsequent -j y.
-    GTEST_COLOR=yes ctest --test-dir build -j $(expr $(nproc --all) / 2) "$@"
+    # note that only the final -j<n_procs> option takes effect.
+    GTEST_COLOR=yes ctest --test-dir build -j$(expr $(nproc --all) / 2) "$@"
 }
 
 set -e