Update cmake to remove duplication

Author: adityapatwardhan

src/libpsl-native/CMakeLists.txt

@@ -3,7 +3,16 @@ project(PSL-NATIVE)
 
 # Can't use add_compile_options with 2.8.11
 set(CMAKE_BUILD_TYPE "Release")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Werror -fstack-protector-strong -fpie -D_FORTIFY_SOURCE=2 -DGLIBC_MIN_VERSION=2.27 -gdwarf-5")
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Werror -fstack-protector-strong -fpie -D_FORTIFY_SOURCE=2 -gdwarf-5")
+
+if(NOT DEFINED PS_GLIBC_MIN_VERSION)
+  set(PS_GLIBC_MIN_VERSION "2.27"
+      CACHE STRING "Minimum glibc version for this build")
+endif()
+
+add_compile_definitions(GLIBC_MIN_VERSION=${PS_GLIBC_MIN_VERSION})
+
 
 if (${CMAKE_SYSTEM_NAME} MATCHES "Linux" OR "FreeBSD")
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,relro,-z,now")

src/libpsl-native/arm.toolchain.cmake

@@ -1,7 +1,8 @@
 set(CMAKE_SYSTEM_NAME Linux)
 set(CMAKE_SYSTEM_VERSION 1)
 set(CMAKE_SYSTEM_PROCESSOR armv7l)
-set(CMAKE_CXX_COMPILER arm-linux-gnueabihf-g++ -fstack-protector-strong -fpie -D_FORTIFY_SOURCE=2 -DGLIBC_MIN_VERSION=2.35)
+set(PS_GLIBC_MIN_VERSION "2.35" CACHE STRING "Minimum glibc version for this toolchain")
+set(CMAKE_CXX_COMPILER arm-linux-gnueabihf-g++ -fstack-protector-strong -fpie -D_FORTIFY_SOURCE=2)
 set(CMAKE_SHARED_LINKER_FLAGS "-Wl,-z,relro,-z,now")
 set(CMAKE_C_COMPILER arm-linux-gnueabihf-gcc)
 

src/libpsl-native/arm64.toolchain.cmake

@@ -1,7 +1,7 @@
 set(CMAKE_SYSTEM_NAME Linux)
 set(CMAKE_SYSTEM_VERSION 1)
 set(CMAKE_SYSTEM_PROCESSOR aarch64)
-set(CMAKE_CXX_COMPILER g++ -fstack-protector-strong -fpie -D_FORTIFY_SOURCE=2 -DGLIBC_MIN_VERSION=2.27)
+set(CMAKE_CXX_COMPILER g++ -fstack-protector-strong -fpie -D_FORTIFY_SOURCE=2)
 set(CMAKE_SHARED_LINKER_FLAGS "-Wl,-z,relro,-z,now")
 set(CMAKE_C_COMPILER gcc)