fix(auth): Build failure due to unsafe flag (#2465)

Author: royjit

.swiftpm/xcode/xcshareddata/xcschemes/AWSCognitoAuthPlugin.xcscheme

@@ -43,6 +43,16 @@
                </Test>
             </SkippedTests>
          </TestableReference>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "AmplifyBigIntegerTests"
+               BuildableName = "AmplifyBigIntegerTests"
+               BlueprintName = "AmplifyBigIntegerTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
       </Testables>
    </TestAction>
    <LaunchAction

AmplifyPlugins/Auth/Sources/libtommath/README.md

@@ -1,3 +1,8 @@
 # libtommath
 
-This is the fork for [LibTomMath](https://github.com/libtom/libtommath). Fork is created from the v1.2.0 at the commit 6ca6898bf37f583c4cc9943441cd60dd69f4b8f2 and renamed files and variables with `amplify` prefix.
+This is the fork for [LibTomMath](https://github.com/libtom/libtommath). Fork is created from the v1.2.0 at the commit 6ca6898bf37f583c4cc9943441cd60dd69f4b8f2 
+With the following changes:
+
+- Renamed files and variables with `amplify` prefix.
+- Removed unsupported platform code from Sources/libtommath/amplify_bn_s_mp_rand_platform.c
+- Removed compile time warning due to unreachable code in Sources/libtommath/amplify_bn_mp_set_double.c

AmplifyPlugins/Auth/Sources/libtommath/amplify_bn_s_mp_rand_platform.c

@@ -138,11 +138,7 @@ amplify_mp_err s_read_ltm_rng(void *p, size_t n);
 amplify_mp_err amplify_s_mp_rand_platform(void *p, size_t n)
 {
    amplify_mp_err err = AMPLIFY_MP_ERR;
-   if ((err != AMPLIFY_MP_OKAY) && AMPLIFY_MP_HAS(S_READ_ARC4RANDOM)) err = s_read_arc4random(p, n);
-   if ((err != AMPLIFY_MP_OKAY) && AMPLIFY_MP_HAS(S_READ_WINCSP))     err = s_read_wincsp(p, n);
-   if ((err != AMPLIFY_MP_OKAY) && AMPLIFY_MP_HAS(S_READ_GETRANDOM))  err = s_read_getrandom(p, n);
    if ((err != AMPLIFY_MP_OKAY) && AMPLIFY_MP_HAS(S_READ_URANDOM))    err = s_read_urandom(p, n);
-   if ((err != AMPLIFY_MP_OKAY) && AMPLIFY_MP_HAS(S_READ_LTM_RNG))    err = s_read_ltm_rng(p, n);
    return err;
 }
 

Package.swift

@@ -160,9 +160,6 @@ let authTargets: [Target] = [
             "changes.txt",
             "LICENSE",
             "README.md"
-        ],
-        cSettings: [
-            .unsafeFlags(["-flto=thin"])  // for Dead Code Elimination
         ]
     ),
     .testTarget(