Revise gnu-*flags and cmake/HDF*CompilerFlags.cmake files to add warning

flags for GCC compilers version 4.8 and above.
Removed files from gnu-warnings that only apply to versions < 4.8.
Consolidated warnings from versions < 4.8 that apply to versions >= 4.8
into the 4.8 warnings files.

29 files changed, 99 insertions, 337 deletions

diff --git a/config/cmake/HDFCXXCompilerFlags.cmake b/config/cmake/HDFCXXCompilerFlags.cmake
index 47991bf..02bf5cd 100644
--- a/config/cmake/HDFCXXCompilerFlags.cmake
+++ b/config/cmake/HDFCXXCompilerFlags.cmake
@@ -86,9 +86,8 @@ if (NOT MSVC)
       endif()
     elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
       if (CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_LOADED 
-          AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 4.2)
-        # autotools adds the C flags with the CXX flags for g++ compiler 
-        # versions 4.2 and above.
+          AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 4.8)
+        # add the general CXX flags for g++ compiler versions 4.8 and above.
         ADD_H5_FLAGS (HDF5_CMAKE_CXX_FLAGS "${HDF5_SOURCE_DIR}/config/gnu-warnings/cxx-general")
         ADD_H5_FLAGS (H5_CXXFLAGS0 "${HDF5_SOURCE_DIR}/config/gnu-warnings/cxx-error-general")
       endif ()
@@ -127,71 +126,9 @@ if (NOT MSVC)
   if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     # Technically, variable-length arrays are part of the C99 standard, but
     #   we should approach them a bit cautiously... Only needed for gcc 4.X
-    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0 AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.2)
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0 AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.8)
       # autotools always add the C flags with the CXX flags
-      ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.2-4.last")
-    endif ()
-    # Append warning flags that only gcc 4.3+ knows about
-    # autotools always add the C flags with the CXX flags
-    if (CMAKE_C_COMPILER_VERSION VERSION_LESS 4.3 AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.2)
-      ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.3")
-    endif()
-
-    # Append more extra warning flags that only gcc 4.4+ know about
-    if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
-      # autotools always add the C flags with the CXX flags
-      ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.4")
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.5+ know about
-    if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.5)
-      # autotools always add the C flags with the CXX flags
-      ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.5")
-      if (HDF5_ENABLE_DEV_WARNINGS)
-        # autotools always add the C flags with the CXX flags
-        #ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/developer-4.5")
-      else ()
-        # autotools always add the C flags with the CXX flags
-        #ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/no-developer-4.5")
-      endif ()
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.6 and less know about
-    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7 AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.2)
-      # autotools always add the C flags with the CXX flags
-      ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.2-4.6")
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.5-4.6 know about
-    if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.5 AND CMAKE_C_COMPILER_VERSION VERSION_LESS 4.7)
-      # autotools always add the C flags with the CXX flags
-      ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.5-4.6")
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.6+ know about
-    if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.6)
-      # autotools always add the C flags with the CXX flags
-      ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.6")
-      if (HDF5_ENABLE_DEV_WARNINGS)
-        # autotools always add the C flags with the CXX flags
-        ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/developer-4.6")
-      else ()
-        # autotools always add the C flags with the CXX flags
-        ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/no-developer-4.6")
-      endif ()
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.7+ know about
-    if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
-      # autotools always add the C flags with the CXX flags
-      ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.7")
-      if (HDF5_ENABLE_DEV_WARNINGS)
-        # autotools always add the C flags with the CXX flags
-        ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/developer-4.7")
-      else ()
-        # autotools always add the C flags with the CXX flags
-        ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/no-developer-4.7")
-      endif ()
+      ADD_H5_FLAGS (H5_CXXFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.8-4.last")
     endif ()
 
     # Append more extra warning flags that only gcc 4.8+ know about
diff --git a/config/cmake/HDFCompilerFlags.cmake b/config/cmake/HDFCompilerFlags.cmake
index 6dbaa64..cd4ab48 100644
--- a/config/cmake/HDFCompilerFlags.cmake
+++ b/config/cmake/HDFCompilerFlags.cmake
@@ -93,11 +93,9 @@ if (NOT MSVC)
         list (APPEND H5_CFLAGS0 "-Wsign-compare -Wtrigraphs -Wwrite-strings")
       endif()
     elseif (CMAKE_C_COMPILER_ID STREQUAL "GNU")
-      # Add general CFlags for GCC versions 4.2 and above
-      if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.2)
-        ADD_H5_FLAGS (HDF5_CMAKE_C_FLAGS "${HDF5_SOURCE_DIR}/config/gnu-warnings/general")
-      endif ()
+      # Add general CFlags for GCC versions 4.8 and above
       if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.8)
+        ADD_H5_FLAGS (HDF5_CMAKE_C_FLAGS "${HDF5_SOURCE_DIR}/config/gnu-warnings/general")
         ADD_H5_FLAGS (H5_CFLAGS0 "${HDF5_SOURCE_DIR}/config/gnu-warnings/error-general")
       endif ()
       # gcc automatically inlines based on the optimization level
@@ -121,13 +119,13 @@ if (NOT MSVC)
     message (STATUS "....HDF5 developer group warnings are enabled")
     if (CMAKE_C_COMPILER_ID STREQUAL "Intel")
       list (APPEND H5_CFLAGS0 "-Winline -Wreorder -Wport -Wstrict-aliasing")
-    elseif (CMAKE_C_COMPILER_ID STREQUAL "GNU")
+    elseif (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.8)
       ADD_H5_FLAGS (H5_CFLAGS0 "${HDF5_SOURCE_DIR}/config/gnu-warnings/developer-general")
     elseif (CMAKE_C_COMPILER_ID STREQUAL "Clang")
       ADD_H5_FLAGS (H5_CFLAGS0 "${HDF5_SOURCE_DIR}/config/clang-warnings/developer-general")
     endif ()
   else ()
-    if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
+    if (CMAKE_C_COMPILER_ID STREQUAL "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.8)
       ADD_H5_FLAGS (H5_CFLAGS0 "${HDF5_SOURCE_DIR}/config/gnu-warnings/no-developer-general")
     elseif (CMAKE_C_COMPILER_ID STREQUAL "Clang")
       ADD_H5_FLAGS (H5_CFLAGS0 "${HDF5_SOURCE_DIR}/config/clang-warnings/no-developer-general")
@@ -138,68 +136,8 @@ if (NOT MSVC)
   if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
     # Technically, variable-length arrays are part of the C99 standard, but
     #   we should approach them a bit cautiously... Only needed for gcc 4.X
-    if (CMAKE_C_COMPILER_VERSION VERSION_LESS 5.0 AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.2)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.2-4.last")
-    endif ()
-
-    # Append warning flags for gcc 4.2-4.3
-    if (CMAKE_C_COMPILER_VERSION VERSION_LESS_EQUAL 4.3 AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.2)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.2-4.3")
-    endif ()
-
-    # Append warning flags for gcc 4.2-4.4
-    if (CMAKE_C_COMPILER_VERSION VERSION_LESS_EQUAL 4.4 AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.2)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.2-4.4")
-    endif ()
-
-    # Append warning flags that only gcc 4.3+ knows about
-    if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.3)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.3")
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.4+ know about
-    if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.4")
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.5+ know about
-    if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.5)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.5")
-      if (HDF5_ENABLE_DEV_WARNINGS)
-        ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/developer-4.5")
-      else ()
-        ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/no-developer-4.5")
-      endif ()
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.6 and less know about
-    if (CMAKE_C_COMPILER_VERSION VERSION_LESS 4.7 AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.2)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.2-4.6")
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.5-4.6 know about
-    if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.5 AND CMAKE_C_COMPILER_VERSION VERSION_LESS 4.7)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.5-4.6")
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.6+ know about
-    if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.6)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.6")
-      if (HDF5_ENABLE_DEV_WARNINGS)
-        ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/developer-4.6")
-      else ()
-        ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/no-developer-4.6")
-      endif ()
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.7+ know about
-    if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.7)
-      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.7")
-      if (HDF5_ENABLE_DEV_WARNINGS)
-        ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/developer-4.7")
-      else ()
-        ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/no-developer-4.7")
-      endif ()
+    if (CMAKE_C_COMPILER_VERSION VERSION_LESS 5.0 AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.8)
+      ADD_H5_FLAGS (H5_CFLAGS1 "${HDF5_SOURCE_DIR}/config/gnu-warnings/4.8-4.last")
     endif ()
 
     # Append more extra warning flags that only gcc 4.8+ know about
diff --git a/config/cmake/HDFFortranCompilerFlags.cmake b/config/cmake/HDFFortranCompilerFlags.cmake
index 495a0ca..15edaa8 100644
--- a/config/cmake/HDFFortranCompilerFlags.cmake
+++ b/config/cmake/HDFFortranCompilerFlags.cmake
@@ -67,23 +67,6 @@ if (NOT MSVC)
   message (STATUS "HDF5_CMAKE_Fortran_FLAGS=${HDF5_CMAKE_Fortran_FLAGS}")
 
   if (CMAKE_Fortran_COMPILER_ID STREQUAL "GNU")
-    # Append warning flags that only gcc 4.4+ knows about
-    ADD_H5_FLAGS (HDF5_CMAKE_Fortran_FLAGS "${HDF5_SOURCE_DIR}/config/gnu-warnings/gfort-4.4")
-
-    # Append more extra warning flags that only gcc 4.5+ know about
-    if (NOT CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 4.5)
-      ADD_H5_FLAGS (HDF5_CMAKE_Fortran_FLAGS "${HDF5_SOURCE_DIR}/config/gnu-warnings/gfort-4.5")
-    endif ()
-
-    # Append more extra warning flags that only gcc 4.6+ know about
-    #if (NOT CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 4.6)
-    #  ADD_H5_FLAGS (HDF5_CMAKE_Fortran_FLAGS "${HDF5_SOURCE_DIR}/config/gnu-warnings/gfort-4.6")
-    #endif ()
-
-    # Append more extra warning flags that only gcc 4.7+ know about
-    if (NOT CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 4.7)
-      ADD_H5_FLAGS (HDF5_CMAKE_Fortran_FLAGS "${HDF5_SOURCE_DIR}/config/gnu-warnings/gfort-4.7")
-    endif ()
 
     # Append more extra warning flags that only gcc 4.8+ know about
     if (NOT CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 4.8)
@@ -95,7 +78,7 @@ if (NOT MSVC)
     #  ADD_H5_FLAGS (HDF5_CMAKE_Fortran_FLAGS "${HDF5_SOURCE_DIR}/config/gnu-warnings/gfort-4.9")
     #endif ()
 
-    # Append more extra warning flags that only gcc 5.1+ know about
+    # Append more extra warning flags that only gcc 5.x+ know about
     if (NOT CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 5.0)
       ADD_H5_FLAGS (HDF5_CMAKE_Fortran_FLAGS "${HDF5_SOURCE_DIR}/config/gnu-warnings/gfort-5")
     endif ()
diff --git a/config/gnu-cxxflags b/config/gnu-cxxflags
index b2ef36d..44cbc69 100644
--- a/config/gnu-cxxflags
+++ b/config/gnu-cxxflags
@@ -180,82 +180,33 @@ if test "X-g++" = "X-$cxx_vendor"; then
     # General #
     ###########
 
-    if test $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 2 -o $cxx_vers_major -gt 4; then
+    # Add various general warning flags in gnu-warnings for gcc versions 4.8 and later.
+    if test $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 8 -o $cxx_vers_major -ge 5; then
         H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments cxx-general)"
         H5_ECXXFLAGS="$H5_ECXXFLAGS $(load_gnu_arguments cxx-error-general)"
-    fi
 
     ######################
     # Developer warnings #
     ######################
 
-    NO_DEVELOPER_WARNING_CXXFLAGS=$(load_gnu_arguments no-developer-general)
-    DEVELOPER_WARNING_CXXFLAGS=$(load_gnu_arguments developer-general)
+        NO_DEVELOPER_WARNING_CXXFLAGS=$(load_gnu_arguments no-developer-general)
+        DEVELOPER_WARNING_CXXFLAGS=$(load_gnu_arguments developer-general)
+
+    fi
 
     #######################
     # gcc 4 special cases #
     #######################
 
-    # GCC 4.2 through 4.6
-    if test $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 2 -o $cxx_vers_major -eq 4 -a $cxx_vers_minor -le 6; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.2-4.6)"
-    fi
-
-    # GCC 4.2 through 4.3
-    if test $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 2 -o $cxx_vers_major -eq 4 -a $cxx_vers_minor -le 3; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.2-4.3)"
-    fi
-
-    # GCC 4.5 through 4.6
-    if test $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 5 -o $cxx_vers_major -eq 4 -a $cxx_vers_minor -le 6; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.5-4.6)"
-    fi
-
-    # GCC 4.2 through 4.4
-    if test $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 2 -a $cxx_vers_major -eq 4 -a $cxx_vers_minor -le 4; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.2-4.4)"
-    fi
-
-    # GCC 4.2 through the end of GCC 4 series
-    if test $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 2; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.2-4.last)"
+    # GCC 4.8 through the end of GCC 4 series
+    if test $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 8; then
+        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.8-4.last)"
     fi
 
     #############################
     # Version-specific warnings #
     #############################
 
-    # gcc >= 4.3
-    if test $cxx_vers_major -ge 5 -o $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 3; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.3)"
-    fi
-
-    # gcc >= 4.4
-    if test $cxx_vers_major -ge 5 -o $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 4; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.4)"
-    fi
-
-    # gcc >= 4.5
-    if test $cxx_vers_major -ge 5 -o $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 5; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.5)"
-        #DEVELOPER_WARNING_CXXFLAGS="$DEVELOPER_WARNING_CXXFLAGS $(load_gnu_arguments developer-4.5)"
-        #NO_DEVELOPER_WARNING_CXXFLAGS="$NO_DEVELOPER_WARNING_CXXFLAGS $(load_gnu_arguments no-developer-4.5)"
-    fi
-
-    # gcc >= 4.6
-    if test $cxx_vers_major -ge 5 -o $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 6; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.6)"
-        DEVELOPER_WARNING_CXXFLAGS="$DEVELOPER_WARNING_CXXFLAGS $(load_gnu_arguments developer-4.6)"
-        NO_DEVELOPER_WARNING_CXXFLAGS="$NO_DEVELOPER_WARNING_CXXFLAGS $(load_gnu_arguments no-developer-4.6)"
-    fi
-
-    # gcc >= 4.7
-    if test $cxx_vers_major -ge 5 -o $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 7; then
-        H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.7)"
-        DEVELOPER_WARNING_CXXFLAGS="$DEVELOPER_WARNING_CXXFLAGS $(load_gnu_arguments developer-4.7)"
-        NO_DEVELOPER_WARNING_CXXFLAGS="$NO_DEVELOPER_WARNING_CXXFLAGS $(load_gnu_arguments no-developer-4.7)"
-    fi
-
     # gcc >= 4.8
     if test $cxx_vers_major -ge 5 -o $cxx_vers_major -eq 4 -a $cxx_vers_minor -ge 8; then
         H5_CXXFLAGS="$H5_CXXFLAGS $(load_gnu_arguments 4.8)"
diff --git a/config/gnu-fflags b/config/gnu-fflags
index eb3519c..105a990 100644
--- a/config/gnu-fflags
+++ b/config/gnu-fflags
@@ -145,25 +145,6 @@ if test "X-gfortran" = "X-$f9x_vendor"; then
     # Version-specific warnings #
     #############################
 
-    # gfortran 4.3 (nothing new)
-
-    # gfortran >= 4.4
-    if test $f9x_vers_major -ge 5 -o $f9x_vers_major -eq 4 -a $f9x_vers_minor -ge 4; then
-        H5_FCFLAGS="$H5_FCFLAGS $(load_gnu_arguments gfort-4.4)"
-    fi
-
-    # gfortran >= 4.5
-    if test $f9x_vers_major -ge 5 -o $f9x_vers_major -eq 4 -a $f9x_vers_minor -ge 5; then
-        H5_FCFLAGS="$H5_FCFLAGS $(load_gnu_arguments gfort-4.5)"
-    fi
-
-    # gfortran 4.6 (nothing new)
-
-    # gfortran >= 4.7
-    if test $f9x_vers_major -ge 5 -o $f9x_vers_major -eq 4 -a $f9x_vers_minor -ge 7; then
-        H5_FCFLAGS="$H5_FCFLAGS $(load_gnu_arguments gfort-4.7)"
-    fi
-
     # gfortran >= 4.8
     if test $f9x_vers_major -ge 5 -o $f9x_vers_major -eq 4 -a $f9x_vers_minor -ge 8; then
         H5_FCFLAGS="$H5_FCFLAGS $(load_gnu_arguments gfort-4.8)"
diff --git a/config/gnu-flags b/config/gnu-flags
index 7e69ede..7cf90b8 100644
--- a/config/gnu-flags
+++ b/config/gnu-flags
@@ -188,84 +188,33 @@ if test "X-gcc" = "X-$cc_vendor"; then
     # General #
     ###########
 
-    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2 -o $cc_vers_major -gt 4; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments general)"
-    fi
+    # Add various general warning flags in gnu-warnings for gcc versions 4.8 and later.
     if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 8 -o $cc_vers_major -gt 4; then
+        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments general)"
         H5_ECFLAGS="$H5_ECFLAGS $(load_gnu_arguments error-general)"
-    fi
 
     ######################
     # Developer warnings #
     ######################
 
-    NO_DEVELOPER_WARNING_CFLAGS=$(load_gnu_arguments no-developer-general)
-    DEVELOPER_WARNING_CFLAGS=$(load_gnu_arguments developer-general)
+        NO_DEVELOPER_WARNING_CFLAGS=$(load_gnu_arguments no-developer-general)
+        DEVELOPER_WARNING_CFLAGS=$(load_gnu_arguments developer-general)
+
+    fi
 
     #######################
     # gcc 4 special cases #
     #######################
 
-    # GCC 4.2 through 4.6
-    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2 -o $cc_vers_major -eq 4 -a $cc_vers_minor -le 6; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.2-4.6)"
-    fi
-
-    # GCC 4.2 through 4.3
-    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2 -o $cc_vers_major -eq 4 -a $cc_vers_minor -le 3; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.2-4.3)"
-    fi
-
-    # GCC 4.5 through 4.6
-    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -le 6; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.5-4.6)"
-    fi
-
-    # GCC 4.2 through 4.4
-    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2 -a $cc_vers_major -eq 4 -a $cc_vers_minor -le 4; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.2-4.4)"
-    fi
-
-    # GCC 4.2 through the end of GCC 4 series
-    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.2-4.last)"
+    # GCC 4.8 through the end of GCC 4 series
+    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 8; then
+        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.8-4.last)"
     fi
 
     #############################
     # Version-specific warnings #
     #############################
 
-    # gcc >= 4.3
-    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 3; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.3)"
-    fi
-
-    # gcc >= 4.4
-    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 4; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.4)"
-    fi
-
-    # gcc >= 4.5
-    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 5; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.5)"
-        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS $(load_gnu_arguments developer-4.5)"
-        NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS $(load_gnu_arguments no-developer-4.5)"
-    fi
-
-    # gcc >= 4.6
-    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 6; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.6)"
-        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS $(load_gnu_arguments developer-4.6)"
-        NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS $(load_gnu_arguments no-developer-4.6)"
-    fi
-
-    # gcc >= 4.7
-    if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 7; then
-        H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.7)"
-        DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS $(load_gnu_arguments developer-4.7)"
-        NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS $(load_gnu_arguments no-developer-4.7)"
-    fi
-
     # gcc >= 4.8
     if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 8; then
         H5_CFLAGS="$H5_CFLAGS $(load_gnu_arguments 4.8)"
diff --git a/config/gnu-warnings/4.2-4.3 b/config/gnu-warnings/4.2-4.3
deleted file mode 100644
index 1881797..0000000
--- a/config/gnu-warnings/4.2-4.3
+++ /dev/null
@@ -1,3 +0,0 @@
-# -Wvolatile-register-var was later incorporated into -Wall and
-# only needs to be specified explicitly for gcc 4.2-4.3
--Wvolatile-register-var
diff --git a/config/gnu-warnings/4.2-4.4 b/config/gnu-warnings/4.2-4.4
deleted file mode 100644
index ec4876f..0000000
--- a/config/gnu-warnings/4.2-4.4
+++ /dev/null
@@ -1,2 +0,0 @@
-# The non-valued form of -Wstrict-overflow is used in gcc 4.2-4.4
--Wstrict-overflow
diff --git a/config/gnu-warnings/4.2-4.6 b/config/gnu-warnings/4.2-4.6
deleted file mode 100644
index 37df4ab..0000000
--- a/config/gnu-warnings/4.2-4.6
+++ /dev/null
@@ -1,2 +0,0 @@
-# Disable warnings about using the 'long long' type w/ gcc 4.6 and earlier
--Wno-long-long
diff --git a/config/gnu-warnings/4.3 b/config/gnu-warnings/4.3
deleted file mode 100644
index 13d8558..0000000
--- a/config/gnu-warnings/4.3
+++ /dev/null
@@ -1,2 +0,0 @@
--Wlarger-than=2560
--Wlogical-op
diff --git a/config/gnu-warnings/4.4 b/config/gnu-warnings/4.4
deleted file mode 100644
index 42929b5..0000000
--- a/config/gnu-warnings/4.4
+++ /dev/null
@@ -1,3 +0,0 @@
--Wframe-larger-than=16384
--Wpacked-bitfield-compat
--Wsync-nand
diff --git a/config/gnu-warnings/4.5 b/config/gnu-warnings/4.5
deleted file mode 100644
index ddb96df..0000000
--- a/config/gnu-warnings/4.5
+++ /dev/null
@@ -1 +0,0 @@
--Wstrict-overflow=5
diff --git a/config/gnu-warnings/4.5-4.6 b/config/gnu-warnings/4.5-4.6
deleted file mode 100644
index d3035fe..0000000
--- a/config/gnu-warnings/4.5-4.6
+++ /dev/null
@@ -1,3 +0,0 @@
-# -Wstrict-aliasing was later incorporated into -Wall and
-# only needs to be specified explicitly for gcc 4.5-4.6
--Wstrict-aliasing
diff --git a/config/gnu-warnings/4.6 b/config/gnu-warnings/4.6
deleted file mode 100644
index 140a20c..0000000
--- a/config/gnu-warnings/4.6
+++ /dev/null
@@ -1,2 +0,0 @@
--Wdouble-promotion
--Wtrampolines
diff --git a/config/gnu-warnings/4.7 b/config/gnu-warnings/4.7
deleted file mode 100644
index c47fe4b..0000000
--- a/config/gnu-warnings/4.7
+++ /dev/null
@@ -1,5 +0,0 @@
-#
-# -Wstack-usage=8192 warnings need to be swept up on a branch so
-# that we can stop burdening the whole development team.
-#
--Wstack-usage=8192
diff --git a/config/gnu-warnings/4.8 b/config/gnu-warnings/4.8
index 5dc577f..c7e3dd1 100644
--- a/config/gnu-warnings/4.8
+++ b/config/gnu-warnings/4.8
@@ -1 +1,25 @@
+# warning flags added for GCC >= 4.3
+-Wlarger-than=2560
+-Wlogical-op
+
+# warning flags added for GCC >= 4.4
+-Wframe-larger-than=16384
+-Wpacked-bitfield-compat
+-Wsync-nand
+
+# warning flag added for GCC >= 4.5
+-Wstrict-overflow=5
+
+# warning flags added for GCC >= 4.6
+-Wdouble-promotion
+-Wtrampolines
+
+# warning flag added for GCC >= 4.7
+#
+# -Wstack-usage=8192 warnings need to be swept up on a branch so
+# that we can stop burdening the whole development team.
+#
+-Wstack-usage=8192
+
+# warning flag added for GCC >= 4.8
 -Wmaybe-uninitialized
diff --git a/config/gnu-warnings/4.2-4.last b/config/gnu-warnings/4.8-4.last
index 2db90fb..2db90fb 100644
--- a/config/gnu-warnings/4.2-4.last
+++ b/config/gnu-warnings/4.8-4.last
diff --git a/config/gnu-warnings/developer-4.5 b/config/gnu-warnings/developer-4.5
deleted file mode 100644
index 48df846..0000000
--- a/config/gnu-warnings/developer-4.5
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# -Wjump-misses-init makes lots of noise for a questionable benefit.
-# Can jumping over an initialization in C cause any harm, if
-# the variable is never *used* before it has been initialized?
-#
--Wjump-misses-init
--Wunsuffixed-float-constants
diff --git a/config/gnu-warnings/developer-4.6 b/config/gnu-warnings/developer-4.6
deleted file mode 100644
index 2372fbf..0000000
--- a/config/gnu-warnings/developer-4.6
+++ /dev/null
@@ -1 +0,0 @@
--Wsuggest-attribute=const
diff --git a/config/gnu-warnings/developer-4.7 b/config/gnu-warnings/developer-4.7
deleted file mode 100644
index a3b0781..0000000
--- a/config/gnu-warnings/developer-4.7
+++ /dev/null
@@ -1,7 +0,0 @@
--Wsuggest-attribute=noreturn
--Wsuggest-attribute=pure
-#
-# It's not clear that -Wvector-operation-performance warnings are
-# actionable, so they are demoted to "developer" warnings.
-#
--Wvector-operation-performance
diff --git a/config/gnu-warnings/developer-4.8 b/config/gnu-warnings/developer-4.8
index b0109e2..fd76f6c 100644
--- a/config/gnu-warnings/developer-4.8
+++ b/config/gnu-warnings/developer-4.8
@@ -1 +1,23 @@
+# developer warning flags added for GCC >= 4.5
+#
+# -Wjump-misses-init makes lots of noise for a questionable benefit.
+# Can jumping over an initialization in C cause any harm, if
+# the variable is never *used* before it has been initialized?
+#
+-Wjump-misses-init
+-Wunsuffixed-float-constants
+
+# developer warning flag added for GCC >= 4.6
+-Wsuggest-attribute=const
+
+# developer warning flags added for GCC >= 4.7
+-Wsuggest-attribute=noreturn
+-Wsuggest-attribute=pure
+#
+# It's not clear that -Wvector-operation-performance warnings are
+# actionable, so they are demoted to "developer" warnings.
+#
+-Wvector-operation-performance
+
+# developer warning flag added for GCC >= 4.8
 -Wsuggest-attribute=format
diff --git a/config/gnu-warnings/gfort-4.4 b/config/gnu-warnings/gfort-4.4
deleted file mode 100644
index 59fe9a2..0000000
--- a/config/gnu-warnings/gfort-4.4
+++ /dev/null
@@ -1,2 +0,0 @@
--Warray-temporaries
--Wintrinsics-std
\ No newline at end of file
diff --git a/config/gnu-warnings/gfort-4.5 b/config/gnu-warnings/gfort-4.5
deleted file mode 100644
index 4490d4e..0000000
--- a/config/gnu-warnings/gfort-4.5
+++ /dev/null
@@ -1 +0,0 @@
--Wimplicit-procedure
diff --git a/config/gnu-warnings/gfort-4.7 b/config/gnu-warnings/gfort-4.7
deleted file mode 100644
index a7532bb..0000000
--- a/config/gnu-warnings/gfort-4.7
+++ /dev/null
@@ -1,2 +0,0 @@
--Wreal-q-constant
--Wfunction-elimination
diff --git a/config/gnu-warnings/gfort-4.8 b/config/gnu-warnings/gfort-4.8
index 1b96a51..9d880de 100644
--- a/config/gnu-warnings/gfort-4.8
+++ b/config/gnu-warnings/gfort-4.8
@@ -1,3 +1,15 @@
+# warning flags added for gfortran >= 4.4
+-Warray-temporaries
+-Wintrinsics-std
+
+# warning flag added for gfortran >= 4.5
+-Wimplicit-procedure
+
+# warning flags added for gfortran >= 4.7
+-Wreal-q-constant
+-Wfunction-elimination
+
+# warning flags added for gfortran >= 4.8
 -Wrealloc-lhs
 -Wrealloc-lhs-all
 # Turn off warnings for passing non-ANSI types to BIND().
diff --git a/config/gnu-warnings/no-developer-4.5 b/config/gnu-warnings/no-developer-4.5
deleted file mode 100644
index ef7d38f..0000000
--- a/config/gnu-warnings/no-developer-4.5
+++ /dev/null
@@ -1 +0,0 @@
--Wno-unsuffixed-float-constants
diff --git a/config/gnu-warnings/no-developer-4.6 b/config/gnu-warnings/no-developer-4.6
deleted file mode 100644
index ea9cc66..0000000
--- a/config/gnu-warnings/no-developer-4.6
+++ /dev/null
@@ -1 +0,0 @@
--Wno-suggest-attribute=const
diff --git a/config/gnu-warnings/no-developer-4.7 b/config/gnu-warnings/no-developer-4.7
deleted file mode 100644
index 5b85e1f..0000000
--- a/config/gnu-warnings/no-developer-4.7
+++ /dev/null
@@ -1,2 +0,0 @@
--Wno-suggest-attribute=noreturn
--Wno-suggest-attribute=pure
diff --git a/config/gnu-warnings/no-developer-4.8 b/config/gnu-warnings/no-developer-4.8
index e42e09f..1e29c78 100644
--- a/config/gnu-warnings/no-developer-4.8
+++ b/config/gnu-warnings/no-developer-4.8
@@ -1 +1,13 @@
+# no-developer warning flag added for GCC >= 4.5
+-Wno-jump-misses-init
+-Wno-unsuffixed-float-constants
+
+# no-developer warning flag added for GCC >= 4.6
+-Wno-suggest-attribute=const
+
+# no-developer warning flags added for GCC >= 4.7
+-Wno-suggest-attribute=noreturn
+-Wno-suggest-attribute=pure
+
+# no-developer warning flag added for GCC >= 4.8
 -Wno-suggest-attribute=format