Add files for adding warning flags for clang compilers in autotools

configure.

1 files changed, 218 insertions, 0 deletions

diff --git a/config/clang-flags b/config/clang-flags
new file mode 100644
index 0000000..32c29d4
--- /dev/null
+++ b/config/clang-flags
@@ -0,0 +1,218 @@
+#                            -*- shell-script -*-
+#
+# 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.
+
+
+# This file should be sourced into configure if the compiler is the
+# Clang compiler or a derivative.  It is careful not to do anything
+# if the compiler is not Clang; otherwise 'cc_flags_set' is set to 'yes'
+#
+
+#
+# For now, do not promote any warnings to errors.
+#
+PROMOTE_ERRORS_DFLT=no
+
+#
+# This filter rewrites -Werror= as -W, in that way demoting warnings
+# promoted to errors back to warnings, if PROMOTE_ERRORS is no.
+#
+demote_errors()
+{
+    if [ ${PROMOTE_ERRORS:-${PROMOTE_ERRORS_DFLT}} = no ]; then
+        sed 's,-Werror=,-W,g'
+    else
+        cat
+    fi
+}
+
+#
+# Prepend `$srcdir/config/clang-warnings/` to the filename suffix(es) given as
+# subroutine argument(s), remove comments starting with # and ending
+# at EOL, replace spans of whitespace (including newlines) with spaces,
+# and re-emit the file(s) thus filtered on the standard output stream.
+#
+load_clang_arguments()
+{
+    set -- $(for arg; do
+        sed 's,#.*$,,' $srcdir/config/clang-warnings/${arg}
+    done)
+    IFS=' ' echo "$*"
+}
+# Get the compiler version in a way that works for clang
+# unless a compiler version is already known
+#
+#   cc_vendor:    The compiler name: clang
+#   cc_version:   Version number: 6.0.0, 7.3.0, ... 10.0.1
+#
+if test "X-" = "X-$cc_flags_set"; then
+    # clang -v will return version number following "clang" on Linux machines,
+    # but on Macs the version number will follow "Apple LLVM version"
+    cc_version="`$CC $CFLAGS $H5_CFLAGS -v 2>&1 |\
+        grep 'clang version' | sed 's/.*clang version \([-a-z0-9\.]*\).*/\1/'`"
+    if test -n "$cc_version"; then
+        cc_vendor="clang"
+    else
+        cc_version="`$CC $CFLAGS $H5_CFLAGS -v 2>&1 |\
+            grep 'Apple LLVM version' | sed 's/.*Apple LLVM version \([-a-z0-9\.]*\).*/\1/'`"
+        cc_vendor="Apple LLVM"
+    fi
+    if test "X-" != "X-$cc_version"; then
+        echo "compiler '$CC' is $cc_vendor-$cc_version"
+
+        # Get the compiler version numbers
+        cc_vers_major=`echo $cc_version | cut -f1 -d.`
+        cc_vers_minor=`echo $cc_version | cut -f2 -d.`
+        cc_vers_patch=`echo $cc_version | cut -f3 -d.`
+        test -n "$cc_vers_major" || cc_vers_major=0
+        test -n "$cc_vers_minor" || cc_vers_minor=0
+        test -n "$cc_vers_patch" || cc_vers_patch=0
+    fi
+fi
+
+if test "X-clang" = "X-$cc_vendor" -o "X-Apple LLVM" = "X-$cc_vendor"; then
+    echo "compiler '$CC' is $cc_vendor-$cc_version"
+    ###############################
+    # Architecture-specific flags #
+    ###############################
+
+    arch=
+    case "$host_os-$host_cpu" in
+        # FreeBSD sets the information from "uname -m" to the general machine
+        # architecture, not the specific CPU for the machine, so even our
+        # Pentium II Xeon server is set to "i386".  Once we know we are on a FreeBSD
+        # machine, use the "sysctl" command to get the CPU hardware model.
+        freebsd*-i386)
+            host_cpu_model=`sysctl -n hw.model`
+            case "$host_cpu_model" in
+                # Hmm.. this might not catch Celerons, but it won't hurt them either...
+                *Pro*|*II*|*III*|*IV*|*Athlon*)
+                    # architecture-specific optimizations cause problems
+                    # for some users who build binaries to be used on
+                    # multiple architectures.
+                    # arch="-march=i686"
+                ;;
+            esac
+            ;;
+
+        *-i686)
+                    # architecture-specific optimizations cause problems
+                    # for some users who build binaries to be used on
+                    # multiple architectures.
+                    # arch="-march=i686"
+            ;;
+    esac
+
+    case "$host_os-$host_cpu" in
+        # cygwin needs the "-std=c99" flag removed, so make
+        # a specific case for Cygwin without the flag and a default
+        # case to add the flag everywhere else
+        cygwin-*)
+            ;;
+
+        *)
+            H5_CFLAGS="$H5_CFLAGS -std=c99"
+            ;;
+    esac
+
+    H5_CFLAGS="$H5_CFLAGS $arch"
+
+    ##############
+    # Production #
+    ##############
+
+    # NDEBUG is handled explicitly by the configure script
+    if test $cc_vers_major -le 4; then
+        PROD_CFLAGS=
+    else
+        PROD_CFLAGS="-fstdarg-opt"
+    fi
+
+    #########
+    # Debug #
+    #########
+
+    # NDEBUG is handled explicitly by the configure script
+    # -g is handled by the symbols flags
+    if test $cc_vers_major -le 4; then
+        DEBUG_CFLAGS=
+    else
+        DEBUG_CFLAGS="-ftrapv -fno-common"
+    fi
+
+    ###########
+    # Symbols #
+    ###########
+
+    NO_SYMBOLS_CFLAGS="-s"
+    SYMBOLS_CFLAGS="-g"
+
+    #############
+    # Profiling #
+    #############
+
+    PROFILE_CFLAGS="-pg"
+
+    ################
+    # Optimization #
+    ################
+
+    if test $cc_vers_major -le 4; then
+        HIGH_OPT_CFLAGS="-O3"
+        DEBUG_OPT_CFLAGS=
+    else
+        HIGH_OPT_CFLAGS="-O3"
+        DEBUG_OPT_CFLAGS="-g"
+    fi
+    NO_OPT_CFLAGS="-O0"
+
+    ############
+    # Warnings #
+    ############
+
+    ###########
+    # 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_clang_arguments general)"
+    fi
+#    if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 8 -o $cc_vers_major -gt 4; then
+#        H5_ECFLAGS="$H5_ECFLAGS $(load_clang_arguments error-general)"
+#    fi
+
+echo "H5_CFLAGS:  $H5_CFLAGS"
+
+    ######################
+    # Developer warnings #
+    ######################
+
+    NO_DEVELOPER_WARNING_CFLAGS=$(load_clang_arguments no-developer-general)
+    DEVELOPER_WARNING_CFLAGS=$(load_clang_arguments developer-general)
+
+    #############################
+    # Version-specific warnings #
+    #############################
+
+
+    #################
+    # Flags are set #
+    #################
+    cc_flags_set=yes
+fi
+
+# Clear cc info if no flags set
+if test "X$cc_flags_set" = "X"; then
+    cc_vendor=
+    cc_version=
+fi
+