build system: add support for cmocka-based tests

Add an --enable-tests switch to configure, which is off by
default. When enabled, check for a recent version of
cmocka (https://cmocka.org/) libraries to build tests with.

It is intended that 'configure --enable-tests' without a suitable
cmocka installation results in an error.

For now, the set of tests is empty.

Signed-off-by: Nathan Lynch <[email protected]>
Signed-off-by: Tyrel Datwyler <[email protected]>

Author: nathanlynch

.gitignore

@@ -18,6 +18,7 @@
 /m4/ltsugar.m4
 /m4/ltversion.m4
 /stamp-h1
+/test-suite.log
 
 # Build outputs that appear in subdirectories
 *.la

Makefile.am

@@ -69,6 +69,12 @@ library_include_HEADERS += \
 noinst_HEADERS += librtasevent_src/rtas_event.h \
 	librtasevent_src/rtas_src_codes.c
 
+if ENABLE_TESTS
+
+TESTS = $(check_PROGRAMS)
+
+endif # ENABLE_TESTS
+
 abixml_dir = $(srcdir)/data/abixml
 librtas_abi_xml = $(abixml_dir)/librtas/$(host_cpu)-$(host_os).xml
 librtasevent_abi_xml = $(abixml_dir)/librtasevent/$(host_cpu)-$(host_os).xml

configure.ac

@@ -25,6 +25,30 @@ AC_CHECK_PROGS([cmd_abidiff], [abidiff])
 LT_INIT
 LT_LANG([C])
 
+# Detection of missing pkg-config macros, per Autoconf manual.
+m4_pattern_forbid([^PKG_])
+
+PKG_PROG_PKG_CONFIG
+
+AC_MSG_CHECKING([whether to enable tests])
+AC_ARG_ENABLE([tests],
+	      [AS_HELP_STRING([--enable-tests],
+	                      [enable tests (default is no)])],
+	      [enable_tests=$enableval],
+	      [enable_tests="no"])
+AC_MSG_RESULT([$enable_tests])
+AM_CONDITIONAL([ENABLE_TESTS], [test "$enable_tests" = "yes"])
+if test "$enable_tests" = "yes"; then
+    cmocka_min_ver=1.1.7
+    PKG_CHECK_MODULES([CMOCKA],
+                      [cmocka >= $cmocka_min_ver],
+                      [cmocka_available="yes"],
+                      [cmocka_available="no"])
+    if test "$cmocka_available" = "no"; then
+        AC_MSG_ERROR([--enable-tests requires cmocka >= $cmocka_min_ver])
+    fi
+fi
+
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 AC_CONFIG_FILES([Makefile librtas.spec])