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# wget_manywarnings.m4 serial 1
dnl Copyright (C) 2016-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Tim Ruehsen
# wget_WORD_SET(RESULT, SET, WORDS)
# --------------------------------------------------
# Add each word in WORDS to SET if not already there and store in RESULT.
# Words separated by whitespace.
AC_DEFUN([wget_WORD_SET], [
ret=$2
words=" $2 "
for word in $3; do
if test "${words#*" $word "}" = "$words"; then ret="$ret $word"; fi
done
$1=$ret
])
# wget_WORD_REMOVE(RESULT, SET, WORDS)
# --------------------------------------------------
# Remove each word in WORDS from SET and store in RESULT.
# Words separated by whitespace.
AC_DEFUN([wget_WORD_REMOVE], [
ret=
words=" $3 "
for word in $2; do
if test "${words#*" $word "}" = "$words"; then ret="$ret $word"; fi
done
$1=$ret
])
# wget_MANYWARNINGS(VARIABLE, LANGUAGE)
# -----------------------------
# Add LANGUAGE related GCC warnings to VARIABLE.
# This only works for gcc >= 4.3.
AC_DEFUN([wget_MANYWARNINGS], [
#
# check if manywarnings is requested
#
AC_ARG_ENABLE([manywarnings],
[AS_HELP_STRING([--enable-manywarnings], [Turn on extra compiler warnings (for developers)])],
[case $enableval in
yes|no) ;;
*) AC_MSG_ERROR([Bad value $enableval for --enable-manywarnings option]) ;;
esac
wget_manywarnings=$enableval
], [
test -f .manywarnings && wget_manywarnings=yes || wget_manywarnings=no
]
)
$1=""
if test "$wget_manywarnings" = yes; then
# AC_PROG_CC sets $GCC to 'yes' if compiler is gcc
# AC_REQUIRE([AC_PROG_CC])
case $CC in
*gcc*) CCNAME="gcc";;
*clang*) CCNAME="clang";;
esac
if test "$CCNAME" = "gcc"; then
test -n "$2" && wget_LANGUAGE=$2 || wget_LANGUAGE=C
# add -Wall -Wextra to reduce number of warn flags
wget_WORD_SET([wget_WARN_CFLAGS], [$CFLAGS], ["-Wall -Wextra -Wformat=2"])
# collect all disabled warn flags in $WARN_CFLAGS
wget_WARN_CFLAGS=$wget_WARN_CFLAGS" "$($CC $wget_WARN_CFLAGS -Q --help=warning,$wget_LANGUAGE|\
awk '{ if (([$]2 == "[[disabled]]" || [$]2 == "")\
&& [$]1!~/=/ && [$]1~/^-W/ && [$]1!~/</ && [$]1!="-Wall") print [$]1 }')
GCC_VERSION=$($CC -dumpversion | cut -f1 -d.)
if test $GCC_VERSION -ge 6; then
wget_WARN_CFLAGS=$wget_WARN_CFLAGS" -Warray-bounds=2 -Wnormalized=nfc -Wshift-overflow=2 -Wunused-const-variable=2"
fi
if test $GCC_VERSION -ge 7; then
wget_WARN_CFLAGS=$wget_WARN_CFLAGS" -Wformat-overflow=2 -Wformat-truncation=1 -Wstringop-overflow=2"
fi
elif test "$CCNAME" = "clang"; then
# set all warn flags on
wget_WORD_SET([wget_WARN_CFLAGS], [$CFLAGS], ["-Weverything"])
fi
$1=$wget_WARN_CFLAGS
fi
])
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