disable -Wredundant-decls for gcc versions older then 4.6

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b2f6d92eddd009992254283a97690db27be4c419..a6ab7896ce86987e3b16fb0894aedba1a13bfebc 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1924,13 +1924,17 @@ if(CMAKE_COMPILER_IS_GNUCC)
        ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_NO_NULL -Wnonnull)  # C only
        ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_MISSING_INCLUDE_DIRS -Wmissing-include-dirs)
        ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_NO_DIV_BY_ZERO -Wno-div-by-zero)
-       ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_REDUNDANT_DECLS -Wredundant-decls)
 
        # gcc 4.2 gives annoying warnings on every file with this
        if (NOT "${CMAKE_C_COMPILER_VERSION}" VERSION_LESS "4.3")
                ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_UNINITIALIZED -Wuninitialized)
        endif()
 
+       # versions before gcc4.6 give many BLI_math warnings
+       if (NOT "${CMAKE_C_COMPILER_VERSION}" VERSION_LESS "4.6")
+               ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_REDUNDANT_DECLS -Wredundant-decls)
+       endif()
+
        # disable because it gives warnings for printf() & friends.
        # ADD_CHECK_C_COMPILER_FLAG(C_WARNINGS C_WARN_DOUBLE_PROMOTION -Wdouble-promotion -Wno-error=double-promotion)