MDEV-26236 ssl_8k_key test fails on x86

Workaround WolfSSL bug wolfSSL/wolfssl#4242
(heap overflow) by using fastmath library everywhere, except Windows clang

Before the patch, default math library was used on all 32bit platforms.

extra/wolfssl/CMakeLists.txt

@@ -107,8 +107,9 @@ ${WOLFCRYPT_SRCDIR}/wolfmath.c
 )
 
 # Use fastmath large number math library.
-IF(NOT (MSVC AND CMAKE_C_COMPILER_ID MATCHES Clang)
-   AND (CMAKE_SIZEOF_VOID_P EQUAL 8))
+IF(NOT (MSVC AND CMAKE_C_COMPILER_ID MATCHES Clang))
+  # Can't use clang-cl with WOLFSSL_FASTMATH
+  # due to https://bugs.llvm.org/show_bug.cgi?id=25305
   SET(WOLFSSL_FASTMATH 1)
 ENDIF()
 
@@ -119,6 +120,21 @@ IF(WOLFSSL_FASTMATH)
   # WolfSSL will use more stack space with it
   SET(FP_MAX_BITS 16384)
   SET(WOLFCRYPT_SOURCES  ${WOLFCRYPT_SOURCES} ${WOLFCRYPT_SRCDIR}/tfm.c)
+  IF((CMAKE_SIZEOF_VOID_P MATCHES 4) AND (CMAKE_SYSTEM_PROCESSOR MATCHES "86")
+     AND (NOT MSVC))
+   # Workaround https://github.com/wolfSSL/wolfssl/issues/4245
+   # On 32bit Intel, to satisfy inline assembly's wish for free registers
+   # 1. use -fomit-frame-pointer
+   # 2. With  GCC 4, additionally use -fno-PIC, which works on x86
+   #    (modern GCC has PIC optimizations, that make it unnecessary)
+   # The following assumes GCC or Clang
+   SET(TFM_COMPILE_FLAGS  "-fomit-frame-pointer")
+   IF(CMAKE_C_COMPILER_VERSION VERSION_LESS "5")
+     SET(TFM_COMPILE_FLAGS  "${TFM_COMPILE_FLAGS} -fno-PIC")
+   ENDIF()
+   SET_SOURCE_FILES_PROPERTIES(${WOLFCRYPT_SRCDIR}/tfm.c
+      PROPERTIES COMPILE_FLAGS ${TFM_COMPILE_FLAGS})
+ ENDIF()
 ELSE()
   SET(WOLFCRYPT_SOURCES  ${WOLFCRYPT_SOURCES} ${WOLFCRYPT_SRCDIR}/integer.c)
 ENDIF()