cmake: always use the same function to test for compiler flags

Fix all cmake tests (including plugin) to use
MY_CHECK_AND_SET_COMPILER_FLAG. And fix that function
to be compatible with cmake 3.0. This way flag checks
are correctly cached (even in cmake 3.0) and properly reused.

9 files changed, 73 insertions, 190 deletions

diff --git a/cmake/check_compiler_flag.cmake b/cmake/check_compiler_flag.cmake
index 4a029659f43..303d5d8d3c8 100644
--- a/cmake/check_compiler_flag.cmake
+++ b/cmake/check_compiler_flag.cmake
@@ -9,11 +9,13 @@ SET(fail_patterns
     FAIL_REGEX "unrecognized .*option"
     FAIL_REGEX "ignoring unknown option"
     FAIL_REGEX "warning:.*ignored"
+    FAIL_REGEX "warning:.*is valid for.*but not for"
     FAIL_REGEX "warning:.*redefined"
     FAIL_REGEX "[Ww]arning: [Oo]ption"
     )
 
-MACRO (MY_CHECK_C_COMPILER_FLAG flag result)
+MACRO (MY_CHECK_C_COMPILER_FLAG flag)
+  STRING(REGEX REPLACE "[-,= ]" "_" result "HAVE_C_${flag}")
   SET(SAVE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
   SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")
   CHECK_C_SOURCE_COMPILES("int main(void) { return 0; }" ${result}
@@ -21,7 +23,8 @@ MACRO (MY_CHECK_C_COMPILER_FLAG flag result)
   SET(CMAKE_REQUIRED_FLAGS "${SAVE_CMAKE_REQUIRED_FLAGS}")
 ENDMACRO()
 
-MACRO (MY_CHECK_CXX_COMPILER_FLAG flag result)
+MACRO (MY_CHECK_CXX_COMPILER_FLAG flag)
+  STRING(REGEX REPLACE "[-,= ]" "_" result "HAVE_CXX_${flag}")
   SET(SAVE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
   SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${flag}")
   CHECK_CXX_SOURCE_COMPILES("int main(void) { return 0; }" ${result}
@@ -35,10 +38,11 @@ FUNCTION(MY_CHECK_AND_SET_COMPILER_FLAG flag)
   IF(WIN32)
     RETURN()
   ENDIF()
-  MY_CHECK_C_COMPILER_FLAG(${flag} HAVE_C_${flag})
-  MY_CHECK_CXX_COMPILER_FLAG(${flag} HAVE_CXX_${flag})
+  MY_CHECK_C_COMPILER_FLAG(${flag})
+  MY_CHECK_CXX_COMPILER_FLAG(${flag})
+  STRING(REGEX REPLACE "[-,= ]" "_" result "${flag}")
   FOREACH(lang C CXX)
-    IF (HAVE_${lang}_${flag})
+    IF (HAVE_${lang}_${result})
       IF(ARGN)
         FOREACH(type ${ARGN})
           SET(CMAKE_${lang}_FLAGS_${type} "${CMAKE_${lang}_FLAGS_${type}} ${flag}" PARENT_SCOPE)
diff --git a/cmake/maintainer.cmake b/cmake/maintainer.cmake
index 5e9d0d3ad99..24547103b63 100644
--- a/cmake/maintainer.cmake
+++ b/cmake/maintainer.cmake
@@ -15,8 +15,8 @@
 
 # Common warning flags for GCC, G++, Clang and Clang++
 SET(MY_WARNING_FLAGS "-Wall -Wextra -Wformat-security -Wno-init-self")
-MY_CHECK_C_COMPILER_FLAG("-Wvla" HAVE_WVLA) # Requires GCC 4.3+ or Clang
-IF(HAVE_WVLA)
+MY_CHECK_C_COMPILER_FLAG("-Wvla") # Requires GCC 4.3+ or Clang
+IF(HAVE_C__Wvla)
   SET(MY_WARNING_FLAGS "${MY_WARNING_FLAGS} -Wvla")
 ENDIF()
 
diff --git a/configure.cmake b/configure.cmake
index e3b40155f88..f4041ef3d94 100644
--- a/configure.cmake
+++ b/configure.cmake
@@ -274,8 +274,8 @@ ENDIF()
 FIND_PACKAGE (Threads)
 
 FUNCTION(MY_CHECK_PTHREAD_ONCE_INIT)
-  CHECK_C_COMPILER_FLAG("-Werror" HAVE_WERROR_FLAG)
-  IF(NOT HAVE_WERROR_FLAG)
+  MY_CHECK_C_COMPILER_FLAG("-Werror")
+  IF(NOT HAVE_C__Werror)
     RETURN()
   ENDIF()
   SET(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror")
diff --git a/storage/mroonga/CMakeLists.txt b/storage/mroonga/CMakeLists.txt
index 26f719c773e..9aa5a4bd990 100644
--- a/storage/mroonga/CMakeLists.txt
+++ b/storage/mroonga/CMakeLists.txt
@@ -132,31 +132,6 @@ include(${MRN_SOURCE_DIR}/build/cmake_modules/ReadFileList.cmake)
 set(MRN_C_COMPILE_FLAGS "")
 set(MRN_CXX_COMPILE_FLAGS "")
 
-macro(mrn_check_cflag flag)
-  string(REGEX REPLACE "[-=]" "_" temporary_variable_name ${flag})
-  string(TOUPPER "${temporary_variable_name}" temporary_variable_name)
-  set(temporary_variable_name "CFLAG${temporary_variable_name}")
-  check_c_compiler_flag(${flag} ${temporary_variable_name})
-  if(${temporary_variable_name})
-    set(MRN_C_COMPILE_FLAGS "${MRN_C_COMPILE_FLAGS} ${flag}")
-  endif()
-endmacro()
-
-macro(mrn_check_cxxflag flag)
-  string(REGEX REPLACE "[-=]" "_" temporary_variable_name ${flag})
-  string(TOUPPER "${temporary_variable_name}" temporary_variable_name)
-  set(temporary_variable_name "CXXFLAG${temporary_variable_name}")
-  check_cxx_compiler_flag(${flag} ${temporary_variable_name})
-  if(${temporary_variable_name})
-    set(MRN_CXX_COMPILE_FLAGS "${MRN_CXX_COMPILE_FLAGS} ${flag}")
-  endif()
-endmacro()
-
-macro(mrn_build_flag flag)
-  mrn_check_cflag(${flag})
-  mrn_check_cxxflag(${flag})
-endmacro()
-
 if(MRN_BUNDLED)
   set(MRN_RELATIVE_DIR_PREFIX "${MRN_SOURCE_DIR}/")
 else()
@@ -360,19 +335,15 @@ else()
   endif()
 
   if(CMAKE_COMPILER_IS_GNUCXX)
-    mrn_build_flag("-Wall")
-    mrn_build_flag("-Wextra")
-    mrn_build_flag("-Wno-unused-parameter")
-    mrn_build_flag("-Wno-strict-aliasing")
-    mrn_build_flag("-Wno-deprecated")
-    mrn_check_cxxflag("-fno-implicit-templates")
-    if(("${MYSQL_VARIANT}" STREQUAL "MariaDB") OR
-        ("${MYSQL_VARIANT}" STREQUAL "MySQL" AND
-         ${MYSQL_VERSION} VERSION_LESS "5.7.0"))
-      mrn_check_cxxflag("-fno-exceptions")
-      mrn_check_cxxflag("-fno-rtti")
-    endif()
-    mrn_check_cxxflag("-felide-constructors")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-Wall")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-Wextra")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-unused-parameter")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-strict-aliasing")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-deprecated")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-fno-implicit-templates")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-fno-exceptions")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-fno-rtti")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-felide-constructors")
   endif()
   set_source_files_properties(${MRN_SOURCES} PROPERTIES
     COMPILE_FLAGS "${MYSQL_CFLAGS} ${MRN_CXX_COMPILE_FLAGS}")
diff --git a/storage/mroonga/vendor/groonga/CMakeLists.txt b/storage/mroonga/vendor/groonga/CMakeLists.txt
index ebe7f6b7fe5..e0652982e73 100644
--- a/storage/mroonga/vendor/groonga/CMakeLists.txt
+++ b/storage/mroonga/vendor/groonga/CMakeLists.txt
@@ -143,59 +143,34 @@ if(CMAKE_COMPILER_IS_GNUCC)
 endif()
 
 
-macro(check_cflag flag)
-  string(REGEX REPLACE "[-=]" "_" temporary_variable_name ${flag})
-  string(TOUPPER "${temporary_variable_name}" temporary_variable_name)
-  set(temporary_variable_name "CFLAG${temporary_variable_name}")
-  check_c_compiler_flag(${flag} ${temporary_variable_name})
-  if(${temporary_variable_name})
-    set(GRN_C_COMPILE_FLAGS "${GRN_C_COMPILE_FLAGS} ${flag}")
-  endif()
-endmacro()
-
-macro(check_cxxflag flag)
-  string(REGEX REPLACE "[-=]" "_" temporary_variable_name ${flag})
-  string(TOUPPER "${temporary_variable_name}" temporary_variable_name)
-  set(temporary_variable_name "CXXFLAG${temporary_variable_name}")
-  check_cxx_compiler_flag(${flag} ${temporary_variable_name})
-  if(${temporary_variable_name})
-    set(GRN_CXX_COMPILE_FLAGS "${GRN_CXX_COMPILE_FLAGS} ${flag}")
-  endif()
-endmacro()
-
-macro(check_build_flag flag)
-  check_cflag(${flag})
-  check_cxxflag(${flag})
-endmacro()
-
 if(CMAKE_COMPILER_IS_GNUCXX)
-  check_build_flag("-Wall")
-  check_build_flag("-Wextra")
-  check_build_flag("-Wno-unused-but-set-variable")
-  check_build_flag("-Wno-unused-parameter")
-  check_build_flag("-Wno-sign-compare")
-  check_cflag("-Wno-pointer-sign")
-  check_build_flag("-Wno-missing-field-initializers")
-  check_build_flag("-Wformat=2")
-  check_build_flag("-Wstrict-aliasing=2")
-  check_build_flag("-fno-strict-aliasing")
-  check_build_flag("-Wdisabled-optimization")
-  check_build_flag("-Wfloat-equal")
-  check_build_flag("-Wpointer-arith")
-  check_cflag("-Wdeclaration-after-statement")
-  check_cflag("-Wbad-function-cast")
-  check_build_flag("-Wcast-align")
-  # check_build_flag("-Wredundant-decls")
-  check_build_flag("-Wwrite-strings")
-  check_cxxflag("-fexceptions")
-  check_cxxflag("-fimplicit-templates")
-  check_build_flag("-Wno-clobbered")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wall")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wextra")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-unused-but-set-variable")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-unused-parameter")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-sign-compare")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-pointer-sign")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-missing-field-initializers")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wformat=2")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wstrict-aliasing=2")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-fno-strict-aliasing")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wdisabled-optimization")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wfloat-equal")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wpointer-arith")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wdeclaration-after-statement")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wbad-function-cast")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wcast-align")
+  #MY_CHECK_AND_SET_COMPILER_FLAG("-Wredundant-decls")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wwrite-strings")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-fexceptions")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-fimplicit-templates")
+  MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-clobbered")
 endif()
 
 if(NOT DEFINED CMAKE_C_COMPILE_OPTIONS_PIC)
   # For old CMake
   if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGCXX)
-    check_build_flag("-fPIC")
+    MY_CHECK_AND_SET_COMPILER_FLAG("-fPIC")
   endif()
 endif()
 
diff --git a/storage/spider/CMakeLists.txt b/storage/spider/CMakeLists.txt
index 33786e2b85a..402c74b2cde 100644
--- a/storage/spider/CMakeLists.txt
+++ b/storage/spider/CMakeLists.txt
@@ -1,10 +1,7 @@
 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DHAVE_HANDLERSOCKET")
 SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DHAVE_HANDLERSOCKET")
 
-IF(HAVE_WVLA)
-  SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Wno-vla")
-  SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wno-vla")
-ENDIF()
+MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-vla" DEBUG)
 
 SET(SPIDER_SOURCES
   spd_param.cc spd_sys_table.cc spd_trx.cc spd_db_conn.cc spd_conn.cc
diff --git a/storage/tokudb/CMakeLists.txt b/storage/tokudb/CMakeLists.txt
index a8a821e5ad6..7cbc8a119e4 100644
--- a/storage/tokudb/CMakeLists.txt
+++ b/storage/tokudb/CMakeLists.txt
@@ -17,12 +17,8 @@ IF(NOT LIBJEMALLOC)
   MESSAGE(WARNING "TokuDB is enabled, but jemalloc is not. This configuration is not supported")
 ENDIF()
 
-IF (HAVE_WVLA)
-  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-vla")
-  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-vla")
-  SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Wno-vla")
-  SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Wno-vla")
-ENDIF()
+MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-vla")
+MY_CHECK_AND_SET_COMPILER_FLAG("-Wno-vla" DEBUG)
 
 ############################################
 SET(TOKUDB_DEB_FILES "usr/lib/mysql/plugin/ha_tokudb.so\netc/mysql/conf.d/tokudb.cnf\nusr/bin/tokuftdump\nusr/share/doc/mariadb-server-10.1/README-TOKUDB\nusr/share/doc/mariadb-server-10.1/README.md" PARENT_SCOPE)
@@ -70,36 +66,7 @@ ENDIF()
 include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
 
-macro(set_cflags_if_supported)
-  foreach(flag ${ARGN})
-    string(REGEX REPLACE "-" "_" temp_flag ${flag})
-    check_c_compiler_flag(${flag} HAVE_C_${temp_flag})
-    if (HAVE_C_${temp_flag})
-      set(CMAKE_C_FLAGS "${flag} ${CMAKE_C_FLAGS}")
-    endif ()
-    check_cxx_compiler_flag(${flag} HAVE_CXX_${temp_flag})
-    if (HAVE_CXX_${temp_flag})
-      set(CMAKE_CXX_FLAGS "${flag} ${CMAKE_CXX_FLAGS}")
-    endif ()
-  endforeach(flag)
-endmacro(set_cflags_if_supported)
-
-macro(append_cflags_if_supported)
-  foreach(flag ${ARGN})
-    string(REGEX REPLACE "-" "_" temp_flag ${flag})
-    check_c_compiler_flag(${flag} HAVE_C_${temp_flag})
-    if (HAVE_C_${temp_flag})
-      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}")
-    endif ()
-    check_cxx_compiler_flag(${flag} HAVE_CXX_${temp_flag})
-    if (HAVE_CXX_${temp_flag})
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}")
-    endif ()
-  endforeach(flag)
-endmacro(append_cflags_if_supported)
-
-set_cflags_if_supported(-Wno-missing-field-initializers)
-append_cflags_if_supported(-Wno-vla)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wno-missing-field-initializers)
 
 ADD_SUBDIRECTORY(ft-index)
 
diff --git a/storage/tokudb/ft-index/cmake_modules/TokuSetupCompiler.cmake b/storage/tokudb/ft-index/cmake_modules/TokuSetupCompiler.cmake
index 99629e40bdb..ee45e7cccf3 100644
--- a/storage/tokudb/ft-index/cmake_modules/TokuSetupCompiler.cmake
+++ b/storage/tokudb/ft-index/cmake_modules/TokuSetupCompiler.cmake
@@ -47,18 +47,6 @@ include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
 
 ## adds a compiler flag if the compiler supports it
-macro(set_cflags_if_supported_named flag flagname)
-  check_c_compiler_flag("${flag}" HAVE_C_${flagname})
-  if (HAVE_C_${flagname})
-    set(CMAKE_C_FLAGS "${flag} ${CMAKE_C_FLAGS}")
-  endif ()
-  check_cxx_compiler_flag("${flag}" HAVE_CXX_${flagname})
-  if (HAVE_CXX_${flagname})
-    set(CMAKE_CXX_FLAGS "${flag} ${CMAKE_CXX_FLAGS}")
-  endif ()
-endmacro(set_cflags_if_supported_named)
-
-## adds a compiler flag if the compiler supports it
 macro(set_cflags_if_supported)
   foreach(flag ${ARGN})
     check_c_compiler_flag(${flag} HAVE_C_${flag})
@@ -84,21 +72,19 @@ macro(set_ldflags_if_supported)
 endmacro(set_ldflags_if_supported)
 
 ## disable some warnings
-set_cflags_if_supported(
-  -Wno-missing-field-initializers
-  -Wstrict-null-sentinel
-  -Winit-self
-  -Wswitch
-  -Wtrampolines
-  -Wlogical-op
-  -Wmissing-format-attribute
-  -Wno-error=missing-format-attribute
-  -Wno-error=address-of-array-temporary
-  -Wno-error=tautological-constant-out-of-range-compare
-  -Wno-ignored-attributes
-  -fno-rtti
-  -fno-exceptions
-  )
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wno-missing-field-initializers)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wstrict-null-sentinel)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Winit-self)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wswitch)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wtrampolines)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wlogical-op)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wmissing-format-attribute)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wno-error=missing-format-attribute)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wno-error=address-of-array-temporary)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wno-error=tautological-constant-out-of-range-compare)
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wno-ignored-attributes)
+MY_CHECK_AND_SET_COMPILER_FLAG(-fno-rtti)
+MY_CHECK_AND_SET_COMPILER_FLAG(-fno-exceptions)
 ## set_cflags_if_supported_named("-Weffc++" -Weffcpp)
 
 if (CMAKE_CXX_FLAGS MATCHES -fno-implicit-templates)
@@ -111,19 +97,12 @@ endif()
 
 ## Clang has stricter POD checks.  So, only enable this warning on our other builds (Linux + GCC)
 if (NOT CMAKE_CXX_COMPILER_ID MATCHES Clang)
-  set_cflags_if_supported(
-    -Wpacked
-    )
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wpacked)
 endif ()
 
 ## this hits with optimized builds somewhere in ftleaf_split, we don't
 ## know why but we don't think it's a big deal
-set_cflags_if_supported(
-  -Wno-error=strict-overflow
-  )
-set_ldflags_if_supported(
-  -Wno-error=strict-overflow
-  )
+MY_CHECK_AND_SET_COMPILER_FLAG(-Wno-error=strict-overflow)
 
 ## set extra debugging flags and preprocessor definitions
 set(CMAKE_C_FLAGS_DEBUG "-g3 -O0 ${CMAKE_C_FLAGS_DEBUG}")
@@ -154,16 +133,15 @@ else ()
 endif ()
 
 ## set warnings
-set_cflags_if_supported(
-  -Wextra
-  -Wbad-function-cast
-  -Wno-missing-noreturn
-  -Wstrict-prototypes
-  -Wmissing-prototypes
-  -Wmissing-declarations
-  -Wpointer-arith
-  -Wmissing-format-attribute
-  -Wshadow
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wextra)
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wbad-function-cast)
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wno-missing-noreturn)
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wstrict-prototypes)
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wmissing-prototypes)
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wmissing-declarations)
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wpointer-arith)
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wmissing-format-attribute)
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wshadow)
   ## other flags to try:
   #-Wunsafe-loop-optimizations
   #-Wpointer-arith
@@ -173,11 +151,10 @@ set_cflags_if_supported(
   #-Wzero-as-null-pointer-constant
   #-Wlogical-op
   #-Wvector-optimization-performance
-  )
 
 if (NOT CMAKE_CXX_COMPILER_ID STREQUAL Clang)
   # Disabling -Wcast-align with clang.  TODO: fix casting and re-enable it, someday.
-  set_cflags_if_supported(-Wcast-align)
+  MY_CHECK_AND_SET_COMPILER_FLAG(-Wcast-align)
 endif ()
 
 ## always want these
diff --git a/storage/xtradb/CMakeLists.txt b/storage/xtradb/CMakeLists.txt
index a6e2014e679..0ae3528e512 100644
--- a/storage/xtradb/CMakeLists.txt
+++ b/storage/xtradb/CMakeLists.txt
@@ -462,14 +462,6 @@ SET(INNOBASE_SOURCES
 	ut/ut0wqueue.cc
 	ut/ut0timer.cc)
 
-# These files have unused result errors, so we skip Werror
-CHECK_C_COMPILER_FLAG("-Werror" HAVE_WERROR)
-IF(HAVE_WERROR)
-  INCLUDE(${MYSQL_CMAKE_SCRIPT_DIR}/compile_flags.cmake)
-  ADD_COMPILE_FLAGS(page/page0zip.c COMPILE_FLAGS "-Wno-error")
-  ADD_COMPILE_FLAGS(ut/ut0ut.c      COMPILE_FLAGS "-Wno-error")
-ENDIF()
-
 IF(XTRADB_OK)
   MYSQL_ADD_PLUGIN(xtradb ${INNOBASE_SOURCES} STORAGE_ENGINE
                    DEFAULT RECOMPILE_FOR_EMBEDDED