Don't guard alignof static asserts on GCC/Clang.

I'm not sure what the history of this is, but it seems to work
just fine in MSVC now.

Change-Id: Iebdc365486bb30a61a1001f705aef7dcaa2a9fcd
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/52985
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/cipher_extra/e_aesctrhmac.c b/crypto/cipher_extra/e_aesctrhmac.c
index 8c45c81..c75f8a8 100644
--- a/crypto/cipher_extra/e_aesctrhmac.c
+++ b/crypto/cipher_extra/e_aesctrhmac.c
@@ -38,11 +38,9 @@
 OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >=
                           sizeof(struct aead_aes_ctr_hmac_sha256_ctx),
                       "AEAD state is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >=
                           alignof(struct aead_aes_ctr_hmac_sha256_ctx),
                       "AEAD state has insufficient alignment");
-#endif
 
 static void hmac_init(SHA256_CTX *out_inner, SHA256_CTX *out_outer,
                       const uint8_t hmac_key[32]) {
diff --git a/crypto/cipher_extra/e_aesgcmsiv.c b/crypto/cipher_extra/e_aesgcmsiv.c
index 555922d..ee20e1b 100644
--- a/crypto/cipher_extra/e_aesgcmsiv.c
+++ b/crypto/cipher_extra/e_aesgcmsiv.c
@@ -45,10 +45,8 @@
 OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) + 8 >=
                           sizeof(struct aead_aes_gcm_siv_asm_ctx),
                       "AEAD state is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >= 8,
                       "AEAD state has insufficient alignment");
-#endif
 
 // asm_ctx_from_ctx returns a 16-byte aligned context pointer from |ctx|.
 static struct aead_aes_gcm_siv_asm_ctx *asm_ctx_from_ctx(
@@ -555,11 +553,9 @@
 OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >=
                           sizeof(struct aead_aes_gcm_siv_ctx),
                       "AEAD state is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >=
                           alignof(struct aead_aes_gcm_siv_ctx),
                       "AEAD state has insufficient alignment");
-#endif
 
 static int aead_aes_gcm_siv_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
                                  size_t key_len, size_t tag_len) {
diff --git a/crypto/cipher_extra/e_chacha20poly1305.c b/crypto/cipher_extra/e_chacha20poly1305.c
index 1650188..a9fce3e 100644
--- a/crypto/cipher_extra/e_chacha20poly1305.c
+++ b/crypto/cipher_extra/e_chacha20poly1305.c
@@ -35,11 +35,9 @@
 OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >=
                           sizeof(struct aead_chacha20_poly1305_ctx),
                       "AEAD state is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >=
                           alignof(struct aead_chacha20_poly1305_ctx),
                       "AEAD state has insufficient alignment");
-#endif
 
 static int aead_chacha20_poly1305_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
                                        size_t key_len, size_t tag_len) {
diff --git a/crypto/cipher_extra/e_tls.c b/crypto/cipher_extra/e_tls.c
index 6d84f7f..9713dc7 100644
--- a/crypto/cipher_extra/e_tls.c
+++ b/crypto/cipher_extra/e_tls.c
@@ -48,11 +48,9 @@
 OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >=
                           sizeof(AEAD_TLS_CTX),
                       "AEAD state is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >=
                           alignof(AEAD_TLS_CTX),
                       "AEAD state has insufficient alignment");
-#endif
 
 static void aead_tls_cleanup(EVP_AEAD_CTX *ctx) {
   AEAD_TLS_CTX *tls_ctx = (AEAD_TLS_CTX *)&ctx->state;
diff --git a/crypto/fipsmodule/cipher/e_aes.c b/crypto/fipsmodule/cipher/e_aes.c
index 61f4ef3..ad64a39 100644
--- a/crypto/fipsmodule/cipher/e_aes.c
+++ b/crypto/fipsmodule/cipher/e_aes.c
@@ -335,11 +335,9 @@
 #endif
 
 static EVP_AES_GCM_CTX *aes_gcm_from_cipher_ctx(EVP_CIPHER_CTX *ctx) {
-#if defined(__GNUC__) || defined(__clang__)
   OPENSSL_STATIC_ASSERT(
       alignof(EVP_AES_GCM_CTX) <= 16,
       "EVP_AES_GCM_CTX needs more alignment than this function provides");
-#endif
 
   // |malloc| guarantees up to 4-byte alignment on 32-bit and 8-byte alignment
   // on 64-bit systems, so we need to adjust to reach 16-byte alignment.
@@ -926,11 +924,9 @@
 OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >=
                           sizeof(struct aead_aes_gcm_ctx),
                       "AEAD state is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >=
                           alignof(struct aead_aes_gcm_ctx),
                       "AEAD state has insufficient alignment");
-#endif
 
 static int aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
                              size_t key_len, size_t requested_tag_len) {
@@ -1266,11 +1262,9 @@
 OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >=
                           sizeof(struct aead_aes_gcm_tls12_ctx),
                       "AEAD state is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >=
                           alignof(struct aead_aes_gcm_tls12_ctx),
                       "AEAD state has insufficient alignment");
-#endif
 
 static int aead_aes_gcm_tls12_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
                                    size_t key_len, size_t requested_tag_len) {
@@ -1365,11 +1359,9 @@
 OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >=
                           sizeof(struct aead_aes_gcm_tls13_ctx),
                       "AEAD state is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >=
                           alignof(struct aead_aes_gcm_tls13_ctx),
                       "AEAD state has insufficient alignment");
-#endif
 
 static int aead_aes_gcm_tls13_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
                                    size_t key_len, size_t requested_tag_len) {
diff --git a/crypto/fipsmodule/cipher/e_aesccm.c b/crypto/fipsmodule/cipher/e_aesccm.c
index fcbd20b..c9d52e0 100644
--- a/crypto/fipsmodule/cipher/e_aesccm.c
+++ b/crypto/fipsmodule/cipher/e_aesccm.c
@@ -279,11 +279,9 @@
 OPENSSL_STATIC_ASSERT(sizeof(((EVP_AEAD_CTX *)NULL)->state) >=
                           sizeof(struct aead_aes_ccm_ctx),
                       "AEAD state is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(union evp_aead_ctx_st_state) >=
                           alignof(struct aead_aes_ccm_ctx),
                       "AEAD state has insufficient alignment");
-#endif
 
 static int aead_aes_ccm_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
                              size_t key_len, size_t tag_len, unsigned M,
diff --git a/crypto/thread_pthread.c b/crypto/thread_pthread.c
index e873d04..1b83294 100644
--- a/crypto/thread_pthread.c
+++ b/crypto/thread_pthread.c
@@ -26,10 +26,8 @@
 
 OPENSSL_STATIC_ASSERT(sizeof(CRYPTO_MUTEX) >= sizeof(pthread_rwlock_t),
                       "CRYPTO_MUTEX is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(CRYPTO_MUTEX) >= alignof(pthread_rwlock_t),
                       "CRYPTO_MUTEX has insufficient alignment");
-#endif
 
 void CRYPTO_MUTEX_init(CRYPTO_MUTEX *lock) {
   if (pthread_rwlock_init((pthread_rwlock_t *) lock, NULL) != 0) {
diff --git a/crypto/thread_win.c b/crypto/thread_win.c
index 49ecc12..1065884 100644
--- a/crypto/thread_win.c
+++ b/crypto/thread_win.c
@@ -29,10 +29,8 @@
 
 OPENSSL_STATIC_ASSERT(sizeof(CRYPTO_MUTEX) >= sizeof(SRWLOCK),
                       "CRYPTO_MUTEX is too small");
-#if defined(__GNUC__) || defined(__clang__)
 OPENSSL_STATIC_ASSERT(alignof(CRYPTO_MUTEX) >= alignof(SRWLOCK),
                       "CRYPTO_MUTEX has insufficient alignment");
-#endif
 
 static BOOL CALLBACK call_once_init(INIT_ONCE *once, void *arg, void **out) {
   void (**init)(void) = (void (**)(void))arg;