Add an option to disable build of extra programs (demos and tests)

Makefile.am

@@ -29,6 +29,7 @@ pkginclude_HEADERS = include/opus.h include/opus_multistream.h include/opus_type
 
 noinst_HEADERS = $(OPUS_HEAD) $(SILK_HEAD) $(CELT_HEAD)
 
+if EXTRA_PROGRAMS
 noinst_PROGRAMS = opus_demo repacketizer_demo opus_compare tests/test_opus_api tests/test_opus_encode tests/test_opus_decode tests/test_opus_padding celt/tests/test_unit_cwrs32 celt/tests/test_unit_dft celt/tests/test_unit_entropy celt/tests/test_unit_laplace celt/tests/test_unit_mathops celt/tests/test_unit_mdct celt/tests/test_unit_rotation celt/tests/test_unit_types
 
 TESTS = celt/tests/test_unit_types celt/tests/test_unit_mathops celt/tests/test_unit_entropy celt/tests/test_unit_laplace celt/tests/test_unit_dft celt/tests/test_unit_mdct celt/tests/test_unit_rotation celt/tests/test_unit_cwrs32 tests/test_opus_api tests/test_opus_decode tests/test_opus_encode tests/test_opus_padding
@@ -79,13 +80,16 @@ celt_tests_test_unit_rotation_LDADD = -lm
 
 celt_tests_test_unit_types_SOURCES = celt/tests/test_unit_types.c
 celt_tests_test_unit_types_LDADD = -lm
+endif
 
 if CUSTOM_MODES
 pkginclude_HEADERS += include/opus_custom.h
+if EXTRA_PROGRAMS
 noinst_PROGRAMS += opus_custom_demo
 opus_custom_demo_SOURCES = celt/opus_custom_demo.c
 opus_custom_demo_LDADD = libopus.la -lm
 endif
+endif
 
 EXTRA_DIST = version.mk \
 	     opus.pc.in \

configure.ac

@@ -210,6 +210,14 @@ if test "$HAVE_DOXYGEN" != "yes" -o "$ac_enable_doc" != "yes"; then
 fi
 AM_CONDITIONAL(HAVE_DOXYGEN, [test $HAVE_DOXYGEN = yes])
 
+ac_enable_extra_programs="yes"
+AC_ARG_ENABLE([extra-programs],
+              AS_HELP_STRING([--disable-extra-programs], [Do not build extra programs (demo and tests)]),
+              [ac_enable_extra_programs=$enableval])
+if test "$ac_enable_extra_programs" != "yes"; then
+  ac_enable_extra_progs="no"
+fi
+
 saved_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS -fvisibility=hidden"
 AC_MSG_CHECKING([if ${CC} supports -fvisibility=hidden])
@@ -272,6 +280,7 @@ AC_SUBST(SIZE32)
 
 AM_CONDITIONAL([FIXED_POINT], [test x$ac_enable_fixed = xyes])
 AM_CONDITIONAL([CUSTOM_MODES], [test x$ac_enable_custom_modes = xyes])
+AM_CONDITIONAL([EXTRA_PROGRAMS], [test x$ac_enable_extra_programs = xyes])
 
 dnl subsitutions for the pkg-config files
 if test x$ac_enable_float = xyes; then
@@ -317,6 +326,7 @@ AC_MSG_RESULT([
       Fuzzing: ....................... ${ac_enable_fuzzing}
 
       API documentation: ............. ${ac_enable_doc}
+      Extra programs: ................ ${ac_enable_extra_programs}
 ------------------------------------------------------------------------
 ])