add r4 default flag to ci

.github/workflows/github_autotools_gnu.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        conf-flag: [ --disable-openmp, --disable-setting-flags, --with-mpi=no]
+        conf-flag: [ --disable-openmp, --disable-setting-flags, --with-mpi=no, --disable-r8-defaults]
         input-flag: [--with-yaml, --enable-test-input=/home/unit_tests_input]
         exclude:
           - conf-flag: --with-mpi=no

configure.ac

@@ -307,6 +307,10 @@ if test $enable_setting_flags = yes; then
   if test $enable_r8_default = yes; then
     GX_FC_DEFAULT_REAL_KIND8_FLAG([dnl
       FCFLAGS="$FCFLAGS $FC_DEFAULT_REAL_KIND8_FLAG"])
+    AM_CONDITIONAL([SKIP_MOSAIC_TESTS], false)
+  else
+    # disable mosaic unit tests if FMS is compiled in r4
+    AM_CONDITIONAL([SKIP_MOSAIC_TESTS], true)
   fi
 
   # individual mixed precision overloads

test_fms/mosaic2/Makefile.am

@@ -50,6 +50,10 @@ EXTRA_DIST = test_mosaic2.sh
 # Run the test program.
 TESTS = test_mosaic2.sh
 
+if SKIP_MOSAIC_TESTS
+  TESTS_ENVIRONMENT = SKIP_TESTS="test_mosaic2.1 test_mosaic2.2 test_mosaic2.3 test_mosaic2.4"
+endif
+
 TEST_EXTENSIONS = .sh
 SH_LOG_DRIVER = env AM_TAP_AWK='$(AWK)' $(SHELL) \
 									$(abs_top_srcdir)/test_fms/tap-driver.sh