cpuid-bool: fix SGX support (take 2) (#68)

Author: newpavlov

cpuid-bool/CHANGELOG.md

@@ -7,9 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## 0.1.0 (2020-07-14)
 ### Fixed
-- SGX target support ([#67])
+- SGX target support ([#68])
 
-[#67]: https://github.com/RustCrypto/utils/pull/67
+[#68]: https://github.com/RustCrypto/utils/pull/68
 
 ## 0.1.0 (2020-06-11)
 - Initial release

cpuid-bool/src/lib.rs

@@ -93,7 +93,7 @@ expand_check_macro! {
 macro_rules! cpuid_bool {
     ($($tf:tt),+ $(,)? ) => {{
         // CPUID is not available on SGX targets
-        #[cfg(not(all(not(target_env = "sgx"), $(target_feature=$tf, )*)))]
+        #[cfg(all(not(target_env = "sgx"), not(all($(target_feature=$tf, )*))))]
         let res = {
             #[cfg(target_arch = "x86")]
             use core::arch::x86::{__cpuid, __cpuid_count};
@@ -111,6 +111,8 @@ macro_rules! cpuid_bool {
             })
         };
 
+        #[cfg(all(target_env = "sgx", not(all($(target_feature=$tf, )*))))]
+        let res = false;
         #[cfg(all($(target_feature=$tf, )*))]
         let res = true;