From e059d5bcb387a91114eeb970039ffd0f0c462042 Mon Sep 17 00:00:00 2001
From: Quincey Koziol <koziol@hdfgroup.org>
Date: Thu, 22 Apr 2010 05:58:27 -0500
Subject: [svn-r18605] Description:     Add new warning flags for gcc 4.5.x

Tested on:
    FreeBSD/32 6.3 (duty) w/gcc 4.5
    FreeBSD/64 6.3 (liberty) w/gcc 4.5
---
 config/gnu-flags | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 65 insertions(+), 4 deletions(-)

diff --git a/config/gnu-flags b/config/gnu-flags
index c1990e0..427b839 100644
--- a/config/gnu-flags
+++ b/config/gnu-flags
@@ -147,8 +147,8 @@ case "$cc_vendor-$cc_version" in
       gcc-2.95.[34])
         PROD_CFLAGS="-O3"
         ;;
-      gcc-4.[34]*)
-        # The optimization level is reduced for gcc 4.[34] due to problems
+      gcc-4.[345]*)
+        # The optimization level is reduced for gcc 4.[345] due to problems
         # with code generation for src/H5Tconv.c with the -O (same -O1)
         # optimization levels (which shows up as failures for long double
         # types -> signed char conversion in the test/dt_arith test).
@@ -192,10 +192,71 @@ esac
 # the information from the previous version and adding modifications to that.
 case "$cc_vendor-$cc_version" in
 
-# Closer to the gcc 4.5 release, we should check for additional flags to
+# Closer to the gcc 4.6 release, we should check for additional flags to
 # include and break it out into it's own section, like the other versions
 # below. -QAK
-  gcc-4.[45]*)
+  gcc-4.[56]*)
+    # Replace -ansi flag with -std=c99 flag
+    H5_CFLAGS="`echo $H5_CFLAGS | sed -e 's/-ansi/-std=c99/g'`"
+
+    # Disable warnings about using 'long long' type
+    H5_CFLAGS="$H5_CFLAGS -Wno-long-long"
+
+    # Append warning flags from gcc-3* case
+    # (don't use -Wpadded flag for normal builds, many of the warnings its
+    #   issuing can't be fixed and they are making it hard to detect other,
+    #   more important warnings)
+    #H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute -Wpadded"
+    H5_CFLAGS="$H5_CFLAGS -Wfloat-equal -Wmissing-format-attribute"
+
+    # Append warning flags from gcc-3.2* case
+    H5_CFLAGS="$H5_CFLAGS -Wmissing-noreturn -Wpacked -Wdisabled-optimization"
+
+    # Enable more format checking flags, beyond the basic -Wformat included
+    # in -Wall
+    H5_CFLAGS="$H5_CFLAGS -Wformat=2"
+
+    # The "unreachable code" warning appears to be reliable now...
+    # (this warning was removed in gcc 4.5+)
+    #H5_CFLAGS="$H5_CFLAGS -Wunreachable-code"
+
+    # Append warning flags from gcc-3.3* case
+    H5_CFLAGS="$H5_CFLAGS -Wendif-labels"
+
+    # Append warning flags from gcc-3.4* case
+    H5_CFLAGS="$H5_CFLAGS -Wdeclaration-after-statement -Wold-style-definition -Winvalid-pch"
+
+    # Replace old -W flag with new -Wextra flag
+    H5_CFLAGS="`echo $H5_CFLAGS | sed -e 's/-W\ /-Wextra\ /g'`"
+
+    # Append more extra warning flags that only gcc4.0+ know about
+    H5_CFLAGS="$H5_CFLAGS -Wvariadic-macros -Wnonnull -Winit-self -Wmissing-include-dirs -Wswitch-default -Wswitch-enum -Wunused-macros"
+
+    # Append more extra warning flags that only gcc 4.1+ know about
+    H5_CFLAGS="$H5_CFLAGS -Wunsafe-loop-optimizations -Wc++-compat"
+
+    # Append more extra warning flags that only gcc 4.2+ know about
+    H5_CFLAGS="$H5_CFLAGS -Wstrict-overflow"
+
+    # Append more extra warning flags that only gcc 4.3+ know about
+    #
+    # Technically, variable-length arrays are part of the C99 standard, but
+    #   we should approach them a bit cautiously... -QAK
+    H5_CFLAGS="$H5_CFLAGS -Wlogical-op -Wlarger-than=2048 -Wvla"
+
+    # Append more extra warning flags that only gcc 4.4+ know about
+    H5_CFLAGS="$H5_CFLAGS -Wsync-nand -Wframe-larger-than=16384 -Wpacked-bitfield-compat"
+
+    # Append more extra warning flags that only gcc 4.5+ know about
+    H5_CFLAGS="$H5_CFLAGS -Wjump-misses-init -Wunsuffixed-float-constants -Wunused-result"
+
+    # Try out the new "stack protector" feature in gcc 4.1
+    # (Strictly speaking this isn't really a "warning" flag, so it's added to
+    #   the debugging flags)
+    #DEBUG_CFLAGS="$DEBUG_CFLAGS -Wstack-protector -fstack-protector-all"
+    ;;
+
+  gcc-4.4*)
     # Replace -ansi flag with -std=c99 flag
     H5_CFLAGS="`echo $H5_CFLAGS | sed -e 's/-ansi/-std=c99/g'`"
 
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