libpthsem: add libpth compatibility option

This commit adds the BR2_PACKAGE_LIBPTHSEM_COMPAT option to the
libpthsem package, in order to enable the compatibility with the pth
library, which is useful to support gnupg2.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libpthsem/Config.in

@@ -7,3 +7,13 @@ config BR2_PACKAGE_LIBPTHSEM
 	  version, with support for semaphores added.
 
 	  http://www.auto.tuwien.ac.at/~mkoegler/pth/
+
+if BR2_PACKAGE_LIBPTHSEM
+
+config BR2_PACKAGE_LIBPTHSEM_COMPAT
+	bool "libpth compatibility"
+	help
+	  This option enables the compatibility with the original
+	  libpth library.
+
+endif

package/libpthsem/libpthsem.mk

@@ -14,4 +14,11 @@ LIBPTHSEM_INSTALL_STAGING = YES
 LIBPTHSEM_DEPENDENCIES = argp-standalone
 LIBPTHSEM_CONFIG_SCRIPTS = pthsem-config
 
+ifeq ($(BR2_PACKAGE_LIBPTHSEM_COMPAT),y)
+LIBPTHSEM_CONF_OPT += --enable-compat
+LIBPTHSEM_CONFIG_SCRIPTS += pth-config
+else
+LIBPTHSEM_CONF_OPT += --disable-compat
+endif
+
 $(eval $(autotools-package))