[libgpiod][PATCH 13/14] build: add a configure switch for building examples

[Bartosz Golaszewski <brgl@xxxxxxxx>]

From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>

Example code for bindings is currently always built if bindings are
enabled. Make it conditional with a new configure switch.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
---
 bindings/cxx/Makefile.am    |  8 +++++++-
 bindings/python/Makefile.am | 10 ++++++++--
 configure.ac                |  6 ++++++
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/bindings/cxx/Makefile.am b/bindings/cxx/Makefile.am
index 5c40ceb..87463b0 100644
--- a/bindings/cxx/Makefile.am
+++ b/bindings/cxx/Makefile.am
@@ -18,10 +18,16 @@ include_HEADERS = gpiod.hpp
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libgpiodcxx.pc
 
-SUBDIRS = . examples
+SUBDIRS = .
 
 if WITH_TESTS
 
 SUBDIRS += tests
 
 endif
+
+if WITH_EXAMPLES
+
+SUBDIRS += examples
+
+endif
diff --git a/bindings/python/Makefile.am b/bindings/python/Makefile.am
index 124f152..5403bcb 100644
--- a/bindings/python/Makefile.am
+++ b/bindings/python/Makefile.am
@@ -6,8 +6,6 @@
 # Copyright (C) 2017-2018 Bartosz Golaszewski <bartekgola@xxxxxxxxx>
 #
 
-SUBDIRS = . examples
-
 pyexec_LTLIBRARIES = gpiod.la
 
 gpiod_la_SOURCES = gpiodmodule.c
@@ -17,8 +15,16 @@ gpiod_la_CFLAGS += -Wall -Wextra -g -std=gnu89 $(PYTHON_CPPFLAGS)
 gpiod_la_LDFLAGS = -module -avoid-version
 gpiod_la_LIBADD = $(top_builddir)/lib/libgpiod.la $(PYTHON_LIBS)
 
+SUBDIRS = .
+
 if WITH_TESTS
 
 SUBDIRS += tests
 
 endif
+
+if WITH_EXAMPLES
+
+SUBDIRS += examples
+
+endif
diff --git a/configure.ac b/configure.ac
index 57c99a8..90a6324 100644
--- a/configure.ac
+++ b/configure.ac
@@ -155,6 +155,12 @@ then
 	fi
 fi
 
+AC_ARG_ENABLE([examples],
+	[AS_HELP_STRING([--enable-examples], [enable building code examples[default=no]])],
+	[if test "x$enableval" = xyes; then with_examples=true; fi],
+	[with_examples=false])
+AM_CONDITIONAL([WITH_EXAMPLES], [test "x$with_examples" = xtrue])
+
 AC_ARG_ENABLE([bindings-cxx],
 	[AS_HELP_STRING([--enable-bindings-cxx],[enable C++ bindings [default=no]])],
 	[if test "x$enableval" = xyes; then with_bindings_cxx=true; fi],
-- 
2.29.1