[tarantool-patches] [PATCH] Fix clang build (fails on -Wno-cast-function-type)

[Alexander Turenko]

The problem is that clang does not support -Wno-cast-function-type flag.
It is the regression from 8c538963a78f22746233b22648fb2aa6933dc135.

Follow up of #3685.
Fixes #3701.
---

branch: https://github.com/tarantool/tarantool/tree/Totktonada/gh-3701-fix-clang-build
issue: https://github.com/tarantool/tarantool/issues/3701

Please, check-in into 1.9 branch.

 cmake/compiler.cmake     | 10 ++++++++++
 src/CMakeLists.txt       |  8 --------
 test/unit/CMakeLists.txt |  8 --------
 3 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/cmake/compiler.cmake b/cmake/compiler.cmake
index 05d33ab48..f1a861533 100644
--- a/cmake/compiler.cmake
+++ b/cmake/compiler.cmake
@@ -95,6 +95,7 @@ check_c_compiler_flag("-Wno-varargs" CC_HAS_WNO_VARARGS)
 check_c_compiler_flag("-Wno-char-subscripts" CC_HAS_WNO_CHAR_SUBSCRIPTS)
 check_c_compiler_flag("-Wno-format-truncation" CC_HAS_WNO_FORMAT_TRUNCATION)
 check_c_compiler_flag("-Wno-implicit-fallthrough" CC_HAS_WNO_IMPLICIT_FALLTHROUGH)
+check_c_compiler_flag("-Wno-cast-function-type" CC_HAS_WNO_CAST_FUNCTION_TYPE)
 
 #
 # Perform build type specific configuration.
@@ -247,6 +248,15 @@ macro(enable_tnt_compile_flags)
         add_compile_flags("C" "-fno-gnu89-inline")
     endif()
 
+    # Suppress noise GCC 8 warnings.
+    #
+    # reflection.h casts a pointer to a member function to an another pointer
+    # to a member function to store it in a structure, but cast it back before
+    # a call. It is legal and does not lead to an undefined behaviour.
+    if (CC_HAS_WNO_CAST_FUNCTION_TYPE)
+        add_compile_flags("C;CXX" "-Wno-cast-function-type")
+    endif()
+
     add_definitions("-D__STDC_FORMAT_MACROS=1")
     add_definitions("-D__STDC_LIMIT_MACROS=1")
     add_definitions("-D__STDC_CONSTANT_MACROS=1")
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2e7e1c436..b1c4cd711 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,14 +3,6 @@
 #
 enable_tnt_compile_flags()
 
-# Suppress noise GCC 8 warnings.
-#
-# reflection.h casts a pointer to a member function to an another pointer to a
-# member function to store it in a structure, but cast it back before a call.
-# It is legal and does not lead to an undefined behaviour.
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-cast-function-type")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-cast-function-type")
-
 include_directories(${LIBEV_INCLUDE_DIR})
 include_directories(${LIBEIO_INCLUDE_DIR})
 include_directories(${LIBCORO_INCLUDE_DIR})
diff --git a/test/unit/CMakeLists.txt b/test/unit/CMakeLists.txt
index b6ffe1cfa..943788b94 100644
--- a/test/unit/CMakeLists.txt
+++ b/test/unit/CMakeLists.txt
@@ -5,14 +5,6 @@ endif()
 file(GLOB all_sources *.c *.cc)
 set_source_files_compile_flags(${all_sources})
 
-# Suppress noise GCC 8 warnings.
-#
-# reflection.h casts a pointer to a member function to an another pointer to a
-# member function to store it in a structure, but cast it back before a call.
-# It is legal and does not lead to an undefined behaviour.
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-cast-function-type")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-cast-function-type")
-
 include_directories(${PROJECT_SOURCE_DIR}/src)
 include_directories(${PROJECT_BINARY_DIR}/src)
 include_directories(${PROJECT_SOURCE_DIR}/src/box)
-- 
2.19.0