Build s2n on apple

Author: sfodagain

crt/CMakeLists.txt

@@ -32,9 +32,10 @@ option(AWS_USE_LIBCRYPTO_TO_SUPPORT_ED25519_EVERYWHERE "Set this if you want to
 string(REPLACE "-g" "-g1" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
 string(REPLACE "-g" "-g1" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
 
-# On Unix we use S2N for TLS and AWS-LC crypto.
-# (On Windows and Apple we use the default OS libraries)
-if ((UNIX AND NOT APPLE) OR AWS_USE_LIBCRYPTO_TO_SUPPORT_ED25519_EVERYWHERE)
+# On Linux and BSD, we use S2N for TLS and AWS-LC crypto.
+# On Windows, we use the default OS libraries.
+# On Apple, we use the default OS libraries by default, but support S2N usage.
+if (UNIX OR AWS_USE_LIBCRYPTO_TO_SUPPORT_ED25519_EVERYWHERE)
     option(USE_OPENSSL "Set this if you want to use your system's OpenSSL compatible libcrypto" OFF)
     include(AwsPrebuildDependency)
 
@@ -48,7 +49,7 @@ if ((UNIX AND NOT APPLE) OR AWS_USE_LIBCRYPTO_TO_SUPPORT_ED25519_EVERYWHERE)
             -DCMAKE_BUILD_TYPE=RelWithDebInfo  # Use the same build type as the rest of the project
         )
 
-        if (APPLE OR WIN32)
+        if (WIN32)
             # Libcrypto implementations typically have several chunky pregenerated tables that add a lot
             # to artifact size. We dont really need them for ed25519 case on win/mac, so favor
             # smaller binary over perf here.
@@ -72,7 +73,7 @@ if ((UNIX AND NOT APPLE) OR AWS_USE_LIBCRYPTO_TO_SUPPORT_ED25519_EVERYWHERE)
 
 endif()
 
-if(UNIX AND NOT APPLE)
+if(UNIX)
     # prebuild s2n-tls.
     aws_prebuild_dependency(
         DEPENDENCY_NAME S2N