[source] dropbear: make ssh compression support configurable

[LEDE Commits]

dedeckeh pushed a commit to source.git, branch master:
https://git.lede-project.org/a816e1eac761bfdac720d00d15feb18b7b9fd1e3

commit a816e1eac761bfdac720d00d15feb18b7b9fd1e3
Author: Marcin Jurkowski <marcin1j at gmail.com>
AuthorDate: Fri Jun 30 13:13:50 2017 +0200

    dropbear: make ssh compression support configurable
    
    Adds config option to enable compression support which is usefull
    when using a terminal sessions over a slow link. Impact on binary
    size is negligible but additional 60 kB (uncompressed) is needed for
    a shared zlib library.
    
    Signed-off-by: Marcin Jurkowski <marcin1j at gmail.com>
---
 package/network/services/dropbear/Config.in | 9 +++++++++
 package/network/services/dropbear/Makefile  | 7 ++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/package/network/services/dropbear/Config.in b/package/network/services/dropbear/Config.in
index 7c2edd7..ca0af9d 100644
--- a/package/network/services/dropbear/Config.in
+++ b/package/network/services/dropbear/Config.in
@@ -32,6 +32,15 @@ config DROPBEAR_ECC
 
 		Increases binary size by about 23 kB (MIPS).
 
+config DROPBEAR_ZLIB
+	bool "Enable compression"
+	default n
+	help
+		Enables compression using shared zlib library.
+
+		Increases binary size by about 0.1 kB (MIPS) and requires additional 62 kB (MIPS)
+		for a shared zlib library.
+
 config DROPBEAR_UTMP
 	bool "Utmp support"
 	default n
diff --git a/package/network/services/dropbear/Makefile b/package/network/services/dropbear/Makefile
index 7302db2..29460ed 100644
--- a/package/network/services/dropbear/Makefile
+++ b/package/network/services/dropbear/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dropbear
 PKG_VERSION:=2017.75
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:= \
@@ -23,7 +23,7 @@ PKG_LICENSE_FILES:=LICENSE libtomcrypt/LICENSE libtommath/LICENSE
 PKG_BUILD_PARALLEL:=1
 PKG_USE_MIPS16:=0
 
-PKG_CONFIG_DEPENDS:=CONFIG_TARGET_INIT_PATH CONFIG_DROPBEAR_ECC CONFIG_DROPBEAR_CURVE25519
+PKG_CONFIG_DEPENDS:=CONFIG_TARGET_INIT_PATH CONFIG_DROPBEAR_ECC CONFIG_DROPBEAR_CURVE25519 CONFIG_DROPBEAR_ZLIB
 
 include $(INCLUDE_DIR)/package.mk
 
@@ -44,6 +44,7 @@ define Package/dropbear
   SECTION:=net
   CATEGORY:=Base system
   TITLE:=Small SSH2 client/server
+  DEPENDS:= +DROPBEAR_ZLIB:zlib
 endef
 
 define Package/dropbear/description
@@ -74,7 +75,7 @@ CONFIGURE_ARGS += \
 	--disable-loginfunc \
 	$(if $(CONFIG_DROPBEAR_PUTUTLINE),,--disable-pututline) \
 	--disable-pututxline \
-	--disable-zlib \
+	$(if $(CONFIG_DROPBEAR_ZLIB),,--disable-zlib) \
 	--enable-bundled-libtom
 
 TARGET_CFLAGS += -DARGTYPE=3 -ffunction-sections -fdata-sections