Disable cmocka tests on non-Linux hosts

configure.ac

@@ -17,6 +17,17 @@ LT_INIT
 PKG_PROG_PKG_CONFIG
 PKG_INSTALLDIR
 AX_COMPILER_FLAGS
+AC_CANONICAL_HOST
+
+AC_MSG_NOTICE([Detected host OS is ${host_os}])
+build_linux=no
+# Detect target system
+case "${host_os}" in
+    linux*)
+        build_linux=yes
+        ;;
+esac
+AM_CONDITIONAL([LINUX], [test "x${build_linux}" = "xyes"])
 
 # Internationalization
 AM_GNU_GETTEXT([external])
@@ -62,10 +73,11 @@ AM_COND_IF([HAVE_DOXYGEN],
     [AC_CONFIG_FILES([Doxyfile])],
     [AC_MSG_WARN(["Doxygen not found; continuing without doxygen support"])])
 
-# cmocka unit tests
+# cmocka unit tests, currently only supported on Linux
 AX_PKG_CHECK_MODULES([CMOCKA], [cmocka], [], [have_cmocka=yes], [have_cmocka=no])
 AM_CONDITIONAL([HAVE_CMOCKA], [test "x$have_cmocka" = xyes])
-AM_COND_IF([HAVE_CMOCKA], [],
+AM_COND_IF([HAVE_CMOCKA], [AM_COND_IF([LINUX], [],
+    [AC_MSG_WARN(["cmocka found, but cannot build on ${host_os}])])],
     [AC_MSG_WARN(["cmocka not found; disabling unit test build"])])
 
 # Check for the presence of tm_gmtoff in struct tm. If we have this, then we

lib/libx52/Makefile.am

@@ -31,6 +31,7 @@ x52include_HEADERS = libx52.h
 # pkg-config files
 pkgconfig_DATA = libx52.pc
 
+if LINUX
 if HAVE_CMOCKA
 LOG_DRIVER = env AM_TAP_AWK='$(AWK)' $(SHELL) $(top_srcdir)/tap-driver.sh
 TESTS = libx52test
@@ -47,6 +48,7 @@ CLEANFILES = test_libx52.c
 test_libx52.c: $(srcdir)/x52_test_gen.py $(srcdir)/x52_tests.json
 	$(AM_V_GEN) $(PYTHON) $(srcdir)/x52_test_gen.py $(srcdir)/x52_tests.json > $@
 endif
+endif
 
 # Extra files that need to be in the distribution
 EXTRA_DIST = libx52.h x52_commands.h x52_common.h README.md