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93 lines
2.9 KiB
Plaintext
93 lines
2.9 KiB
Plaintext
# wget_manywarnings.m4 serial 1
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dnl Copyright (C) 2016-2024 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Tim Ruehsen
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# wget_WORD_SET(RESULT, SET, WORDS)
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# --------------------------------------------------
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# Add each word in WORDS to SET if not already there and store in RESULT.
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# Words separated by whitespace.
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AC_DEFUN([wget_WORD_SET], [
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ret=$2
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words=" $2 "
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for word in $3; do
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if test "${words#*" $word "}" = "$words"; then ret="$ret $word"; fi
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done
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$1=$ret
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])
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# wget_WORD_REMOVE(RESULT, SET, WORDS)
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# --------------------------------------------------
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# Remove each word in WORDS from SET and store in RESULT.
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# Words separated by whitespace.
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AC_DEFUN([wget_WORD_REMOVE], [
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ret=
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words=" $3 "
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for word in $2; do
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if test "${words#*" $word "}" = "$words"; then ret="$ret $word"; fi
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done
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$1=$ret
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])
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# wget_MANYWARNINGS(VARIABLE, LANGUAGE)
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# -----------------------------
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# Add LANGUAGE related GCC warnings to VARIABLE.
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# This only works for gcc >= 4.3.
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AC_DEFUN([wget_MANYWARNINGS], [
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#
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# check if manywarnings is requested
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#
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AC_ARG_ENABLE([manywarnings],
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[AS_HELP_STRING([--enable-manywarnings], [Turn on extra compiler warnings (for developers)])],
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[case $enableval in
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yes|no) ;;
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*) AC_MSG_ERROR([Bad value $enableval for --enable-manywarnings option]) ;;
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esac
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wget_manywarnings=$enableval
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], [
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test -f .manywarnings && wget_manywarnings=yes || wget_manywarnings=no
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]
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)
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$1=""
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if test "$wget_manywarnings" = yes; then
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# AC_PROG_CC sets $GCC to 'yes' if compiler is gcc
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# AC_REQUIRE([AC_PROG_CC])
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case $CC in
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*gcc*) CCNAME="gcc";;
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*clang*) CCNAME="clang";;
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esac
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if test "$CCNAME" = "gcc"; then
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test -n "$2" && wget_LANGUAGE=$2 || wget_LANGUAGE=C
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# add -Wall -Wextra to reduce number of warn flags
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wget_WORD_SET([wget_WARN_CFLAGS], [$CFLAGS], ["-Wall -Wextra -Wformat=2"])
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# collect all disabled warn flags in $WARN_CFLAGS
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wget_WARN_CFLAGS=$wget_WARN_CFLAGS" "$($CC $wget_WARN_CFLAGS -Q --help=warning,$wget_LANGUAGE|\
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awk '{ if (([$]2 == "[[disabled]]" || [$]2 == "")\
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&& [$]1!~/=/ && [$]1~/^-W/ && [$]1!~/</ && [$]1!="-Wall") print [$]1 }')
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GCC_VERSION=$($CC -dumpversion | cut -f1 -d.)
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if test $GCC_VERSION -ge 6; then
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wget_WARN_CFLAGS=$wget_WARN_CFLAGS" -Warray-bounds=2 -Wnormalized=nfc -Wshift-overflow=2 -Wunused-const-variable=2"
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fi
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if test $GCC_VERSION -ge 7; then
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wget_WARN_CFLAGS=$wget_WARN_CFLAGS" -Wformat-overflow=2 -Wformat-truncation=1 -Wstringop-overflow=2"
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fi
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elif test "$CCNAME" = "clang"; then
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# set all warn flags on
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wget_WORD_SET([wget_WARN_CFLAGS], [$CFLAGS], ["-Weverything"])
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fi
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$1=$wget_WARN_CFLAGS
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fi
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])
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