1 files changed, 83 insertions, 18 deletions
diff --git a/config/BlankForm b/config/BlankForm
index 5ff807b..6b76385 100644
--- a/config/BlankForm
+++ b/config/BlankForm
@@ -9,31 +9,96 @@
 # Compiler flags. The CPPFLAGS values should not include package debug
 # flags like `-DH5G_DEBUG' since these are added with the
 # `--enable-debug' switch of configure.
+#----------------------------------------------------------------------------
 
-# Sometimes a particular compiler must be used.  If that's the case
-# then uncomment the following line.  Otherwise the main configure
-# script will try to detect the compiler automatically.
-#CC=gcc
 
-# What must *always* be present for things to compile correctly?
-#CFLAGS="$CFLAGS -ansi"
-#CPPFLAGS="$CPPFLAGS -I."
+# Choosing a C Compiler
+# ---------------------
+#
+# Configre will use the value of environment variable `CC' if it is
+# set.  If not then configure checks for a working GNU `gcc' followed
+# by other common compiler names.  If a default compiler is desired
+# then uncomment the following line, replacing `gcc' with the name of
+# the default compiler.
 
-# What compiler flags should be used for code development?
-DEBUG_CFLAGS=-g
-DEBUG_CPPFLAGS=
+#CC=${CC:-gcc}
 
-# What compiler flags should be used for building a production
-# library?
-PROD_CFLAGS=-O
-PROD_CPPFLAGS=
 
-# What compiler flags enable code profiling?
-PROFILE_CFLAGS=-pg
-PROFILE_CPPFLAGS=
 
 
-#----------------------------------------------------------------------------
+# C Compiler and Preprocessor Flags
+# ---------------------------------
+#
+# Flags that end with `_CFLAGS' are always passed to the compiler.
+# Flags that end with `_CPPFLAGS' are passed to the compiler when
+# compiling but not when linking.
+#
+# DEBUG_CFLAGS		Flags to pass to the compiler to create a
+# DEBUG_CPPFLAGS	library suitable for use with debugging
+#			tools. Usually this list will exclude
+#			optimization switches (like `-O') and include
+#			switches that turn on symbolic debugging
+#			support (like `-g').
+#
+# PROD_CFLAGS		Flags to pass to the compiler to create a
+# PROD_CPPFLAGS		production version of the library.  These
+#			usualy exclude symbolic debugging switches
+#			(like `-g') and include optimization switches
+#			(like `-O').
+#
+# PROFILE_CFLAGS	Flags to pass to the compiler to create a
+# PROFILE_CPPFLAGS	library suitable for performance testing (like 
+# 			`-pg').  This may or may not include debugging 
+# 			or production flags.
+#			
+# CFLAGS		Flags can be added to this variable which
+#			might already be partially initialized.  These 
+#			flags will always be passed to the compiler
+#			and should include switches to turn on full
+#			warnings.  HDF5 attempts to be ANSI and Posix
+#			compliant and employ good programming
+#			practices resulting in few if any
+#			warnings.
+#
+# Note:			Warning flags do not have to be added to CFLAGS
+#			variable if the compiler is the GNU gcc
+#			compiler or a descendent of gcc.
+#
+# Note:			The CFLAGS should contains *something* or else 
+#			configure will probably add `-g'.  For most
+#			systems this isn't a problem but some systems
+#			will disable optimizations in favor of the
+#			`-g'.
+#			
+#
+
+case "$CC" in
+    *gcc*)
+	CFLAGS="$CFLAGS -Wsign-compare" #Only works for some versions
+	DEBUG_CFLAGS="-g -fverbose-asm"
+	DEBUG_CPPFLAGS="-DH5F_OPT_SEEK=0 -DH5F_LOW_DFLT=H5F_LOW_SEC2"
+	PROD_CFLAGS="-mcpu=pentiumpro -march=pentiumpro -O3 -finline-functions -malign-double -fomit-frame-pointer -fschedule-insns2"
+	PROD_CPPFLAGS=
+	PROFILE_CFLAGS="-pg"
+	PROFILE_CPPFLAGS=
+	;;
+
+    *)
+	CFLAGS="$CFLAGS -ansi"
+	DEBUG_FLAGS="-g"
+	DEBUG_CPPFLAGS="-DH5F_OPT_SEEK=0 -DH5F_LOW_DFLT=H5F_LOW_SEC2"
+	PROD_CFLAGS="-O"
+	PROD_CPPFLAGS=
+	PROFILE_CFLAGS="-pg"
+	PROFILE_CPPFLAGS=
+	;;
+esac
+
+
+
+# Overriding Configure Tests
+# --------------------------
+#
 # Values for overriding configuration tests when cross compiling.
 # This includes compiling on some machines where the serial front end
 # compiles for a parallel back end.