MDEV-7398 mysqld segfaults on FreeBSD 10.1 i386 when built with clang 3.4

in cmake tests let's treat clang like gcc (same options,
same builtins) in many cases.

* don't check the compiler when
  * testing for -fvisibility=hidden support
  * testing for HAVE_ABI_CXA_DEMANGLE
  * testing for HAVE_GCC_ATOMIC_BUILTINS
  * when removing options with string(replace)
  * when running ${CC} --version (ignore the error instead)
* run ABI checks for clang
* use "canonical" gcc flags for clang
* fix groonga too

Also:

* add cmake detection for gcc __atomic_* builtins. they might be
  supported (__ATOMIC_SEQ_CST is defined), but not for all operand
  sizes. In particular, 64-bit atomic load is problematic on i386
* cache check results for Windows
* remove the test for HAVE_CXXABI_H (HAVE_ABI_CXA_DEMANGLE is
  suffifient)

cmake/abi_check.cmake

@@ -28,7 +28,7 @@ ELSE()
  SET(RUN_ABI_CHECK 0)
 ENDIF()
 
-IF(CMAKE_COMPILER_IS_GNUCC AND RUN_ABI_CHECK)
+IF(CMAKE_C_COMPILER_ID MATCHES "GNU|Clang" AND RUN_ABI_CHECK)
   IF(CMAKE_C_COMPILER MATCHES "ccache$")
     SET(COMPILER ${CMAKE_C_COMPILER_ARG1})
     STRING(REGEX REPLACE "^ " "" COMPILER ${COMPILER})

cmake/libutils.cmake

@@ -308,17 +308,15 @@ INCLUDE(CheckCCompilerFlag)
 
 SET(VISIBILITY_HIDDEN_FLAG)
 
-IF(CMAKE_COMPILER_IS_GNUCXX AND UNIX)
+IF(CMAKE_C_COMPILER_ID MATCHES "SunPro")
+  SET(VISIBILITY_HIDDEN_FLAG "-xldscope=hidden")
+ELSEIF(UNIX)
   CHECK_C_COMPILER_FLAG("-fvisibility=hidden" HAVE_VISIBILITY_HIDDEN)
   IF(HAVE_VISIBILITY_HIDDEN)
     SET(VISIBILITY_HIDDEN_FLAG "-fvisibility=hidden")
   ENDIF()
 ENDIF()
 
-IF(CMAKE_C_COMPILER_ID MATCHES "SunPro")
-  SET(VISIBILITY_HIDDEN_FLAG "-xldscope=hidden")
-ENDIF()
-
 # We try to hide the symbols in yassl/zlib to avoid name clashes with
 # other libraries like openssl.
 FUNCTION(RESTRICT_SYMBOL_EXPORTS target)

cmake/maintainer.cmake

@@ -41,11 +41,11 @@ IF(MYSQL_MAINTAINER_MODE MATCHES "ERR")
 ENDIF()
 
 # Set warning flags for GCC/Clang
-IF(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
+IF(CMAKE_C_COMPILER_ID MATCHES "GNU|Clang")
   SET(MY_MAINTAINER_C_WARNINGS "${MY_C_WARNING_FLAGS}")
 ENDIF()
 # Set warning flags for G++/Clang++
-IF(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+IF(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
   SET(MY_MAINTAINER_CXX_WARNINGS "${MY_CXX_WARNING_FLAGS}")
 ENDIF()
 

cmake/os/WindowsCache.cmake

@@ -351,7 +351,6 @@ SET(C_HAS___inline 1 CACHE INTERNAL "")
 SET(FIONREAD_IN_SYS_IOCTL CACHE INTERNAL "")
 SET(FIONREAD_IN_SYS_FILIO CACHE INTERNAL "")
 SET(GWINSZ_IN_SYS_IOCTL CACHE INTERNAL "")
-SET(HAVE_CXXABI_H CACHE INTERNAL "")
 SET(HAVE_NDIR_H CACHE INTERNAL "")
 SET(HAVE_SYS_NDIR_H CACHE INTERNAL "")
 SET(HAVE_SYS_NDIR_H CACHE INTERNAL "")
@@ -371,4 +370,8 @@ SET(HAVE_PTHREAD_ATTR_GETGUARDSIZE CACHE INTERNAL "")
 SET(HAVE_UCONTEXT_H CACHE INTERNAL "")
 SET(HAVE_SOCKPEERCRED CACHE INTERNAL "")
 SET(HAVE_GGDB3 CACHE INTERNAL "")
+SET(HAVE_ABI_CXA_DEMANGLE CACHE INTERNAL "")
+SET(HAVE_GCC_ATOMIC_BUILTINS CACHE INTERNAL "")
+SET(HAVE_GCC_C11_ATOMICS CACHE INTERNAL "")
+SET(HAVE_VISIBILITY_HIDDEN CACHE INTERNAL "")
 ENDIF(MSVC)

config.h.cmake

@@ -27,7 +27,6 @@
 #cmakedefine HAVE_BSEARCH 1
 #cmakedefine HAVE_CRYPT_H 1
 #cmakedefine HAVE_CURSES_H 1
-#cmakedefine HAVE_CXXABI_H 1
 #cmakedefine HAVE_BFD_H 1
 #cmakedefine HAVE_NCURSES_H 1
 #cmakedefine HAVE_NDIR_H 1
@@ -471,6 +470,7 @@
 #cmakedefine MY_ATOMIC_MODE_DUMMY 1
 #cmakedefine MY_ATOMIC_MODE_RWLOCKS 1
 #cmakedefine HAVE_GCC_ATOMIC_BUILTINS 1
+#cmakedefine HAVE_GCC_C11_ATOMICS 1
 #cmakedefine HAVE_SOLARIS_ATOMIC 1
 #cmakedefine HAVE_DECL_SHM_HUGETLB 1
 #cmakedefine HAVE_LARGE_PAGES 1

configure.cmake

@@ -52,7 +52,7 @@ IF(NOT SYSTEM_TYPE)
   ENDIF()
 ENDIF()
 
-IF(CMAKE_COMPILER_IS_GNUCXX)
+IF(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
   # MySQL "canonical" GCC flags. At least -fno-rtti flag affects
   # ABI and cannot be simply removed. 
   SET(CMAKE_CXX_FLAGS 
@@ -175,7 +175,6 @@ CHECK_INCLUDE_FILES (alloca.h HAVE_ALLOCA_H)
 CHECK_INCLUDE_FILES (aio.h HAVE_AIO_H)
 CHECK_INCLUDE_FILES (arpa/inet.h HAVE_ARPA_INET_H)
 CHECK_INCLUDE_FILES (crypt.h HAVE_CRYPT_H)
-CHECK_INCLUDE_FILE_CXX (cxxabi.h HAVE_CXXABI_H)
 CHECK_INCLUDE_FILES (bfd.h BFD_H_EXISTS)
 CHECK_INCLUDE_FILES (dirent.h HAVE_DIRENT_H)
 CHECK_INCLUDE_FILES (dlfcn.h HAVE_DLFCN_H)
@@ -874,7 +873,7 @@ ENDIF(NOT HAVE_POSIX_SIGNALS)
 # Assume regular sprintf
 SET(SPRINTFS_RETURNS_INT 1)
 
-IF(CMAKE_COMPILER_IS_GNUCXX AND HAVE_CXXABI_H)
+IF(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
 CHECK_CXX_SOURCE_COMPILES("
  #include <cxxabi.h>
  int main(int argc, char **argv) 
@@ -946,7 +945,6 @@ SET(SIGNAL_WITH_VIO_CLOSE 1)
 MARK_AS_ADVANCED(NO_ALARM)
 
 
-IF(CMAKE_COMPILER_IS_GNUCXX)
 IF(WITH_ATOMIC_OPS STREQUAL "up")
   SET(MY_ATOMIC_MODE_DUMMY 1 CACHE BOOL "Assume single-CPU mode, no concurrency")
 ELSEIF(WITH_ATOMIC_OPS STREQUAL "rwlocks")
@@ -977,10 +975,17 @@ ELSEIF(NOT WITH_ATOMIC_OPS)
     return 0;
   }"
   HAVE_GCC_ATOMIC_BUILTINS)
+  CHECK_CXX_SOURCE_COMPILES("
+  int main()
+  {
+    long long int var= 1;
+    long long int *ptr= &var;
+    return (int)__atomic_load_n(ptr, __ATOMIC_SEQ_CST);
+  }"
+  HAVE_GCC_C11_ATOMICS)
 ELSE()
   MESSAGE(FATAL_ERROR "${WITH_ATOMIC_OPS} is not a valid value for WITH_ATOMIC_OPS!")
 ENDIF()
-ENDIF()
 
 SET(WITH_ATOMIC_OPS "${WITH_ATOMIC_OPS}" CACHE STRING
   "Implement atomic operations using pthread rwlocks (rwlocks); or atomic CPU

extra/yassl/CMakeLists.txt

@@ -20,12 +20,9 @@ INCLUDE_DIRECTORIES(
  ${CMAKE_SOURCE_DIR}/extra/yassl/taocrypt/mySTL)
 
 ADD_DEFINITIONS(${SSL_DEFINES})
-IF(CMAKE_COMPILER_IS_GNUXX)
-  #Remove -fno-implicit-templates 
-  #(yassl sources cannot  be compiled with  it)
-  STRING(REPLACE "-fno-implicit-templates" "" CMAKE_CXX_FLAGS
-${CMAKE_CXX_FLAGS})
-ENDIF()
+#Remove -fno-implicit-templates
+#(yassl sources cannot  be compiled with  it)
+STRING(REPLACE "-fno-implicit-templates" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
 SET(YASSL_SOURCES  src/buffer.cpp src/cert_wrapper.cpp src/crypto_wrapper.cpp src/handshake.cpp src/lock.cpp 
 				src/log.cpp src/socket_wrapper.cpp src/ssl.cpp src/timer.cpp src/yassl_error.cpp 
 				src/yassl_imp.cpp src/yassl_int.cpp)

include/atomic/gcc_builtins.h

@@ -31,8 +31,8 @@
 #define make_atomic_store_body(S)  *a= v
 #define MY_ATOMIC_MODE "gcc-builtins-up"
 
-#elif defined(__ATOMIC_SEQ_CST)
-#define MY_ATOMIC_MODE "gcc-builtins-smp"
+#elif defined(HAVE_GCC_C11_ATOMICS)
+#define MY_ATOMIC_MODE "gcc-atomics-smp"
 #define make_atomic_load_body(S)                    \
   ret= __atomic_load_n(a, __ATOMIC_SEQ_CST)
 #define make_atomic_store_body(S)                   \

include/my_stacktrace.h

@@ -35,8 +35,7 @@
 
 #define HAVE_WRITE_CORE
 
-#if HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS && \
-    HAVE_CXXABI_H && HAVE_ABI_CXA_DEMANGLE && \
+#if HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS && HAVE_ABI_CXA_DEMANGLE && \
     HAVE_WEAK_SYMBOL
 #define BACKTRACE_DEMANGLE 1
 #endif

plugin/handler_socket/CMakeLists.txt

@@ -6,9 +6,7 @@ IF(WIN32)
 ENDIF()
 
 #Remove -fno-implicit-templates from compiler flags(handlersocket would not work  with  it)
-IF(CMAKE_COMPILER_IS_GNUCXX)
-  STRING(REPLACE "-fno-implicit-templates" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
-ENDIF()
+STRING(REPLACE "-fno-implicit-templates" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
 
 INCLUDE_DIRECTORIES(libhsclient)
 

scripts/CMakeLists.txt

@@ -147,22 +147,16 @@ SET(CONFIGURE_LINE "Built using CMake")
 
 # Also required for mysqlbug, autoconf only supports --version so for now we
 # just explicitly require GNU
-IF(CMAKE_COMPILER_IS_GNUCC)
-  EXECUTE_PROCESS(
-    COMMAND ${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1} --version
-    COMMAND sed 1q
-    OUTPUT_VARIABLE CC_VERSION)
-ELSE()
-  SET(CC_VERSION "")
-ENDIF()
-IF(CMAKE_COMPILER_IS_GNUCXX)
-  EXECUTE_PROCESS(
-    COMMAND ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1} --version
-    COMMAND sed 1q
-    OUTPUT_VARIABLE CXX_VERSION)
-ELSE()
-  SET(CXX_VERSION "")
-ENDIF()
+EXECUTE_PROCESS(
+  COMMAND ${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1} --version
+  COMMAND sed 1q
+  ERROR_QUIET
+  OUTPUT_VARIABLE CC_VERSION)
+EXECUTE_PROCESS(
+  COMMAND ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1} --version
+  COMMAND sed 1q
+  ERROR_QUIET
+  OUTPUT_VARIABLE CXX_VERSION)
 
 CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/mysqlbug.sh
   ${CMAKE_CURRENT_BINARY_DIR}/mysqlbug ESCAPE_QUOTES @ONLY)

storage/mroonga/vendor/groonga/CMakeLists.txt

@@ -168,7 +168,7 @@ macro(check_build_flag flag)
   check_cxxflag(${flag})
 endmacro()
 
-if(CMAKE_COMPILER_IS_GNUCXX)
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGCXX)
   check_build_flag("-Wall")
   check_build_flag("-Wextra")
   check_build_flag("-Wno-unused-but-set-variable")
@@ -201,7 +201,7 @@ endif()
 
 option(GRN_WITH_DEBUG "enable debug build." OFF)
 if(GRN_WITH_DEBUG)
-  if(CMAKE_COMPILER_IS_GNUCXX)
+  if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGCXX)
     set(GRN_C_COMPILE_FLAGS "${GRN_C_COMPILE_FLAGS} -g3 -O0")
     set(GRN_CXX_COMPILE_FLAGS "${GRN_CXX_COMPILE_FLAGS} -g3 -O0")
   endif()