Add flag use_target_attributes

cbits/aes/x86ni.h

@@ -40,8 +40,13 @@
 #include <cryptonite_aes.h>
 #include <aes/block128.h>
 
+#ifdef WITH_TARGET_ATTRIBUTES
 #define TARGET_AESNI __attribute__((target("ssse3,aes")))
 #define TARGET_AESNI_PCLMUL __attribute__((target("sse4.1,aes,pclmul")))
+#else
+#define TARGET_AESNI
+#define TARGET_AESNI_PCLMUL
+#endif
 
 #ifdef IMPL_DEBUG
 TARGET_AESNI

cryptonite.cabal

@@ -103,6 +103,11 @@ Flag check_alignment
   Default:           False
   Manual:            True
 
+Flag use_target_attributes
+  Description:       use GCC / clang function attributes instead of global target options.
+  Default:           False
+  Manual:            True
+
 Library
   Exposed-modules:   Crypto.Cipher.AES
                      Crypto.Cipher.AESGCMSIV
@@ -337,8 +342,12 @@ Library
 
   if flag(support_aesni) && (os(linux) || os(freebsd) || os(osx)) && (arch(i386) || arch(x86_64))
     CC-options:     -DWITH_AESNI
+    if !flag(use_target_attributes)
+      CC-options:     -mssse3 -maes
     if flag(support_pclmuldq)
       CC-options:   -DWITH_PCLMUL
+      if !flag(use_target_attributes)
+        CC-options:     -msse4.1 -mpclmul
     C-sources:       cbits/aes/x86ni.c
                    , cbits/aes/generic.c
                    , cbits/aes/gf.c
@@ -385,6 +394,8 @@ Library
     Build-depends:   deepseq
   if flag(check_alignment)
     cc-options:     -DWITH_ASSERT_ALIGNMENT
+  if flag(use_target_attributes)
+    cc-options:     -DWITH_TARGET_ATTRIBUTES
 
 Test-Suite test-cryptonite
   type:              exitcode-stdio-1.0