Updated gfortran options.

* Removed conclude_fc.am, which was causing verbose builds. Need to
  investigate more, though.
* Added gfortran 9 warnings and flags. This will need to be separated
  into other version blocks based on when the options first appeared.
* The standard is now explicitly set at 2008.

2 files changed, 69 insertions, 63 deletions

diff --git a/config/conclude_fc.am b/config/conclude_fc.am
deleted file mode 100644
index 15d04a7..0000000
--- a/config/conclude_fc.am
+++ /dev/null
@@ -1,31 +0,0 @@
-## config/conclude_fc.am
-## (Use double hashes for copyright notice so that automake treats it as
-## comments and does not pass it to Makefile.in)
-## Copyright by The HDF Group.
-## Copyright by the Board of Trustees of the University of Illinois.
-## All rights reserved.
-##
-## This file is part of HDF5.  The full HDF5 copyright notice, including
-## terms governing use, modification, and redistribution, is contained in
-## the COPYING file, which can be found at the root of the source code
-## distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
-## If you do not have access to either file, you may request a copy from
-## help@hdfgroup.org.
-
-
-## Textually included at the end of the Fortran HDF5 Makefiles.am.
-
-# Makefile.am include fragment with Fortran helper rules and macros.
-
-# AM_FCCPPFLAGS, FCCPPFLAGS are currently not used.
-
-PPFCCOMPILE = $(FC) $(FCDEFS) $(DEFAULT_INCLUDES)  $(FCINCLUDES) $(AM_FCCPPFLAGS) $(FCCPPFLAGS) $(AM_FCFLAGS) $(FCFLAGS)
-LTPPFCCOMPILE = $(LIBTOOL) --tag=FC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(PPFCCOMPILE)
-
-# Treat all .f90 and .F90 files as preprocessed Fortran.
-.f90.o:
-	$(PPFCCOMPILE) -c -o $@ $<
-.F90.o:
-	$(PPFCCOMPILE) -c -o $@ $<
-
-include $(top_srcdir)/config/conclude.am
diff --git a/config/gnu-fflags b/config/gnu-fflags
index 6b5e6a1..3a47787 100644
--- a/config/gnu-fflags
+++ b/config/gnu-fflags
@@ -1,4 +1,4 @@
-#							-*- shell-script -*-
+#                            -*- shell-script -*-
 #
 # Copyright by The HDF Group.
 # Copyright by the Board of Trustees of the University of Illinois.
@@ -25,9 +25,8 @@
 #
 if test X = "X$f9x_flags_set"; then
     f9x_version="`$FC $FCFLAGS $H5_FCFLAGS -v 2>&1 |grep 'gcc version' |\
-	        sed 's/.*gcc version \([-a-z0-9\.]*\).*/\1/'`"
+            sed 's/.*gcc version \([-a-z0-9\.]*\).*/\1/'`"
     if test X != "X$f9x_version"; then
-#        is_mpi="`$FC $FCFLAGS $H5_FCFLAGS -help 2>&1 |grep 'link MPI'`"
         f9x_vendor=`echo $f9x_version |sed 's/\([a-z]*\).*/\1/'`
         f9x_version=`echo $f9x_version |sed 's/[-a-z]//g'`
         if test X = "X$f9x_vendor" -a X != "X$f9x_version"; then
@@ -37,24 +36,29 @@ if test X = "X$f9x_flags_set"; then
             echo "compiler '$FC' is GNU $f9x_vendor-$f9x_version"
         fi
 
-        # Some version numbers
+        # Get the compiler version numbers
         f9x_vers_major=`echo $f9x_version | cut -f1 -d.`
         f9x_vers_minor=`echo $f9x_version | cut -f2 -d.`
         f9x_vers_patch=`echo $f9x_version | cut -f3 -d.`
         test -n "$f9x_vers_major" || f9x_vers_major=0
         test -n "$f9x_vers_minor" || f9x_vers_minor=0
         test -n "$f9x_vers_patch" || f9x_vers_patch=0
-        f9x_vers_all=`expr $f9x_vers_major '*' 1000000 + $f9x_vers_minor '*' 1000 + $f9x_vers_patch`
     fi
 fi
 
-# Common GNU flags for various situations
 if test "X-gfortran" = "X-$f9x_vendor"; then
-    # Insert section about version specific problems from gnu-flags here, if
-    # necessary.
+
+    FC_BASENAME=gfortran
+    F9XSUFFIXFLAG=""
+    FSEARCH_DIRS=""
+
+    H5_FCFLAGS="$H5_FCFLAGS -std=f2008"
+
+    ###############################
+    # Architecture-specific flags #
+    ###############################
 
     arch=
-    # Architecture-specific flags
     # Nothing currently. (Uncomment code below and modify to add any)
     #case "$host_os-$host_cpu" in
     #    *-i686)
@@ -62,43 +66,76 @@ if test "X-gfortran" = "X-$f9x_vendor"; then
     #        ;;
     #esac
 
-    # Host-specific flags
-    # Nothing currently. (Uncomment code below and modify to add any)
-    #case "`hostname`" in
-    #    sleipnir.ncsa.uiuc.edu)
-    #        arch="$arch -pipe"
-    #        ;;
-    #esac
-
-    # General
-    FC_BASENAME=gfortran
-    F9XSUFFIXFLAG=""
-    FSEARCH_DIRS=""
-    H5_FCFLAGS="$H5_FCFLAGS -pedantic -Wall -Wextra -Wunderflow -Wimplicit-interface -Wsurprising"
+    H5_FCFLAGS="$H5_FCFLAGS $arch"
 
-    # Turn off warnings for passing non-ANSI types to BIND().
-    # We pass a lot of hid_t, etc. types so this generates a LOT of spurious warnings.
-    H5_FCFLAGS="$H5_FCFLAGS -Wno-c-binding-type"
+    ##############
+    # Production #
+    ##############
 
-    # Production
     PROD_FCFLAGS=
 
-    # Debug
-    DEBUG_FCFLAGS="-fbounds-check"
+    #########
+    # Debug #
+    #########
+
+    # Need to figure out an appropriate version for the switch.
+    if test $f9x_vers_major -ge 9; then
+        DEBUG_FCFLAGS="-fcheck=all"
+    else
+        DEBUG_FCFLAGS="-fbounds-check"
+    fi
+
+    ###########
+    # Symbols #
+    ###########
 
-    # Symbols
     SYMBOLS_FCFLAGS="-g"
     NO_SYMBOLS_FCFLAGS="-s"
 
-    # Profiling
+    #############
+    # Profiling #
+    #############
+
     PROFILE_FCFLAGS="-pg"
 
-    # Optimization
+    ################
+    # Optimization #
+    ################
+
     HIGH_OPT_FCFLAGS="-O2"
     DEBUG_OPT_FCFLAGS="-O0"
     NO_OPT_FCFLAGS="-O0"
 
-    # Flags are set
+    ############
+    # Warnings #
+    ############
+
+    ###########
+    # General #
+    ###########
+
+    H5_FCFLAGS="$H5_FCFLAGS -pedantic -Wall -Wextra -Wunderflow -Wimplicit-interface -Wsurprising"
+
+    # Turn off warnings for passing non-ANSI types to BIND().
+    # We pass a lot of hid_t, etc. types so this generates a LOT of spurious warnings.
+    H5_FCFLAGS="$H5_FCFLAGS -Wno-c-binding-type"
+
+    #############################
+    # Version-specific warnings #
+    #############################
+
+    # gcc 9
+    # Move to other versions (9 is just the current version)
+    if test $f9x_vers_major -ge 9; then
+        H5_FCFLAGS="$H5_FCFLAGS -Waliasing -Warray-temporaries -Wcharacter-truncation"
+        H5_FCFLAGS="$H5_FCFLAGS -Wconversion-extra -Wfrontend-loop-interchange -Wimplicit-procedure"
+        H5_FCFLAGS="$H5_FCFLAGS -Winteger-division -Wintrinsics-std -Wreal-q-constant"
+        H5_FCFLAGS="$H5_FCFLAGS -Wuse-without-only -Wrealloc-lhs -Wrealloc-lhs-all"
+    fi
+
+    #################
+    # Flags are set #
+    #################
     f9x_flags_set=yes
 fi