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hdf5/config/gnu-flags
Dana Robinson 492d186a5c Revert "Revert "Moved -Wunsuffixed-float-constants to the developer warnings."" 
This reverts commit 6486e06545.
2020-01-23 14:40:47 -08:00

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# -*- 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
# GNU gcc compiler or a derivative. It is careful not to do anything
# if the compiler is not GNU; otherwise 'cc_flags_set' is set to 'yes'
#
# Get the compiler version in a way that works for gcc
# unless a compiler version is already known
#
# cc_vendor: The compiler name: gcc
# cc_version: Version number: 2.91.60, 2.7.2.1
#
if test "X-" = "X-$cc_flags_set"; then
# PathScale compiler spits out gcc version string too. Need to
# filter it out.
# icc beginning with version 12 includes a "gcc version compatiblilty"
# string, causing the gcc H5_CFLAGS to be erroneously added. The line
# "grep -v 'icc version'" causes the discarding of any output
# containing 'icc version'. The cc_version for icc is correctly determined
# and flags added in the intel-flags script.
cc_version="`$CC $CFLAGS $H5_CFLAGS -v 2>&1 | grep -v 'PathScale' |\
grep -v 'icc version' |\
grep 'gcc version' | sed 's/.*gcc version \([-a-z0-9\.]*\).*/\1/'`"
cc_vendor=`echo $cc_version |sed 's/\([a-z]*\).*/\1/'`
cc_version=`echo $cc_version |sed 's/[-a-z]//g'`
if test X = "X$cc_vendor" -a X != "X$cc_version"; then
cc_vendor=gcc
fi
if test "-" != "$cc_vendor-$cc_version"; then
echo "compiler '$CC' is GNU $cc_vendor-$cc_version"
fi
# 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
if test "X-gcc" = "X-$cc_vendor"; then
###############################
# Architecture-specific flags #
###############################
arch=
case "$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 -fno-omit-frame-pointer"
#############
# Profiling #
#############
PROFILE_CFLAGS="-pg"
################
# Optimization #
################
if test $cc_vers_major -le 4; then
HIGH_OPT_CFLAGS="-O3"
DEBUG_OPT_CFLAGS=
else
HIGH_OPT_CFLAGS="-O3"
DEBUG_OPT_CFLAGS="-Og"
fi
NO_OPT_CFLAGS="-O0"
############
# Warnings #
############
###########
# General #
###########
# Note that some of the flags listed here really should be developer
# flags (listed in a separate variable, below) but we put them here
# because they are not raised by the current code and we'd like to
# know if they do start showing up.
#
# NOTE: Don't add -Wpadded here since we can't/won't fix the (many)
# warnings that are emitted. If you need it, add it from the
# environment variable at configure time.
#
# NOTE: Disable the -Wformat-nonliteral from -Wformat=2 here and re-add
# it to the developer flags.
#
# NOTE: Due to the divergence in the C and C++, we're dropping support for
# compiling the C library with a C++ compiler and dropping the -Wc++-compat
# warning.
H5_CFLAGS="$H5_CFLAGS -pedantic -Wall -Wextra -Wbad-function-cast -Wno-c++-compat -Wcast-align"
H5_CFLAGS="$H5_CFLAGS -Wcast-qual -Wconversion -Wdeclaration-after-statement -Wdisabled-optimization -Wfloat-equal"
H5_CFLAGS="$H5_CFLAGS -Wformat=2 -Wno-format-nonliteral -Winit-self -Winvalid-pch -Wmissing-declarations -Wmissing-include-dirs"
H5_CFLAGS="$H5_CFLAGS -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpacked"
H5_CFLAGS="$H5_CFLAGS -Wredundant-decls -Wshadow -Wstrict-prototypes -Wswitch-enum -Wswitch-default"
H5_CFLAGS="$H5_CFLAGS -Wundef -Wunused-macros -Wunsafe-loop-optimizations -Wwrite-strings"
######################
# Developer warnings #
######################
# (suggestions from gcc, not code problems)
# NOTE: -Wformat-nonliteral added back in here (from being disabled in H5_CFLAGS)
DEVELOPER_WARNING_CFLAGS="-Winline -Waggregate-return -Wmissing-format-attribute -Wmissing-noreturn -Wformat-nonliteral"
NO_DEVELOPER_WARNING_CFLAGS="-Wno-inline -Wno-aggregate-return -Wno-missing-format-attribute -Wno-missing-noreturn"
#######################
# gcc 4 special cases #
#######################
# Disable warnings about using the 'long long' type w/ gcc 4.6 and earlier
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 -Wno-long-long"
fi
# -Wvolatile-register-var was later incorporated into -Wall and
# only needs to be specified explicitly for gcc 4.2-4.3
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 -Wvolatile-register-var"
fi
# -Wstrict-aliasing was later incorporated into -Wall and
# only needs to be specified explicitly for gcc 4.5-4.6
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 -Wstrict-aliasing"
fi
# The non-valued form of -Wstrict-overflow is used in gcc 4.2-4.4
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 -Wstrict-overflow"
fi
# -Wvla was later incorporated into -Wpedantic and
# only needs to be specified explicitly for gcc 4
if test $cc_vers_major -eq 4 -a $cc_vers_minor -ge 2; then
H5_CFLAGS="$H5_CFLAGS -Wvla"
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 -Wlogical-op -Wlarger-than=2560"
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 -Wsync-nand -Wframe-larger-than=16384 -Wpacked-bitfield-compat"
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 -Wstrict-overflow=5 -Wjump-misses-init"
DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wunsuffixed-float-constants"
NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS -Wno-unsuffixed-float-constants"
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 -Wdouble-promotion -Wtrampolines"
DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wsuggest-attribute=const"
NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS -Wno-suggest-attribute=const"
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 -Wstack-usage=8192 -Wvector-operation-performance"
DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wsuggest-attribute=pure -Wsuggest-attribute=noreturn"
NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS -Wno-suggest-attribute=pure -Wno-suggest-attribute=noreturn"
fi
# gcc 4.8
if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 8; then
DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wsuggest-attribute=format"
NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS -Wno-suggest-attribute=format"
fi
# gcc 4.9
if test $cc_vers_major -ge 5 -o $cc_vers_major -eq 4 -a $cc_vers_minor -ge 9; then
H5_CFLAGS="$H5_CFLAGS -Wdate-time"
fi
# gcc 5
if test $cc_vers_major -ge 5; then
H5_CFLAGS="$H5_CFLAGS -Warray-bounds=2 -Wc99-c11-compat"
fi
# gcc 6
if test $cc_vers_major -ge 6; then
H5_CFLAGS="$H5_CFLAGS -Wnull-dereference -Wunused-const-variable -Wduplicated-cond -Whsa -Wnormalized"
fi
# gcc 7
if test $cc_vers_major -ge 7; then
DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wstringop-overflow=2"
H5_CFLAGS="$H5_CFLAGS -Walloc-zero -Walloca -Wduplicated-branches -Wformat-overflow=2 -Wformat-truncation=1 -Wimplicit-fallthrough=5 -Wrestrict"
fi
# gcc 8
if test $cc_vers_major -ge 8; then
DEVELOPER_WARNING_CFLAGS="$DEVELOPER_WARNING_CFLAGS -Wstringop-overflow=4 -Wsuggest-attribute=cold -Wsuggest-attribute=malloc"
NO_DEVELOPER_WARNING_CFLAGS="$NO_DEVELOPER_WARNING_CFLAGS -Wno-suggest-attribute=cold -Wno-suggest-attribute=malloc"
H5_CFLAGS="$H5_CFLAGS -Wattribute-alias -Wcast-align=strict -Wshift-overflow=2"
fi
# gcc 9
if test $cc_vers_major -ge 9; then
H5_CFLAGS="$H5_CFLAGS -Wattribute-alias=2 -Wmissing-profile"
fi
#################
# 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
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