From: Florian Fainelli <f.fainelli@gmail.com>
Date: Sun, 5 Feb 2017 02:41:34 +0000 (-0800)
Subject: cmake: Check for getrandom system call
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fubox.git;a=commitdiff_plain;h=fce9382b4b99178fdbd188bec098b9b085327fef

cmake: Check for getrandom system call

In case we are building against a kernel that is too old and does not
support SYS_getrandom, error out with a message indicating so.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6cf0c93..9033493 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,10 +16,17 @@ IF(DEBUG)
   ADD_DEFINITIONS(-DDEBUG -g3)
 ENDIF()
 
-ADD_EXECUTABLE(getrandom getrandom.c)
-INSTALL(TARGETS getrandom
-	RUNTIME DESTINATION bin
-)
+INCLUDE (CheckSymbolExists)
+CHECK_SYMBOL_EXISTS(SYS_getrandom sycall.h getrandom)
+
+IF(getrandom)
+  ADD_EXECUTABLE(getrandom getrandom.c)
+  INSTALL(TARGETS getrandom
+          RUNTIME DESTINATION bin
+  )
+ELSE()
+  message( FATAL_ERROR "Kernel too old, missing SYS_getrandom system call")
+ENDIF()
 
 ADD_EXECUTABLE(kmodloader kmodloader.c)
 TARGET_LINK_LIBRARIES(kmodloader ubox)