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dnl Copyright (C) 1997-2024 Free Software Foundation, Inc.
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 3 of the License, or
dnl (at your option) any later version.
dnl
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program. If not, see <http://www.gnu.org/licenses/>.
dnl
dnl --enable-build-warnings is for developers of the simulator.
dnl it enables extra GCC specific warnings.
AC_DEFUN([SIM_AC_OPTION_WARNINGS], [dnl
AC_ARG_ENABLE(werror,
AS_HELP_STRING([--enable-werror], [treat compile warnings as errors]),
[case "${enableval}" in
yes | y) ERROR_ON_WARNING="yes" ;;
no | n) ERROR_ON_WARNING="no" ;;
*) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
esac])
dnl Enable -Werror by default when using gcc. Turn it off for releases.
if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" && $development; then
ERROR_ON_WARNING=yes
fi
WERROR_CFLAGS=""
if test "${ERROR_ON_WARNING}" = yes ; then
WERROR_CFLAGS="-Werror"
fi
dnl The options we'll try to enable.
dnl NB: Kept somewhat in sync with gdbsupport/warnings.m4.
build_warnings="-Wall -Wpointer-arith
-Wno-unused -Wunused-value -Wunused-variable -Wunused-function
-Wno-switch -Wno-char-subscripts
-Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable
-Wno-sign-compare -Wno-error=maybe-uninitialized
dnl C++ -Wno-mismatched-tags
-Wno-error=deprecated-register
dnl C++ -Wsuggest-override
-Wimplicit-fallthrough=5
-Wduplicated-cond
-Wshadow=local
dnl C++ -Wdeprecated-copy
dnl C++ -Wdeprecated-copy-dtor
dnl C++ -Wredundant-move
-Wmissing-declarations
dnl C++ -Wstrict-null-sentinel
"
dnl Some extra warnings we use in the sim.
build_warnings="$build_warnings
-Wdeclaration-after-statement
-Wdeprecated-non-prototype
-Wimplicit-function-declaration
-Wimplicit-int
-Wincompatible-function-pointer-types
-Wincompatible-pointer-types
-Wint-conversion
-Wmisleading-indentation
-Wmissing-parameter-type
-Wmissing-prototypes
-Wold-style-declaration
-Wold-style-definition
-Wpointer-sign
-Wreturn-mismatch
-Wreturn-type
-Wshift-negative-value
-Wstrict-prototypes
dnl The cgen virtual insn logic involves enum conversions.
dnl Disable until we can figure out how to make this work.
-Wno-enum-conversion
"
build_build_warnings="
dnl TODO Figure out the igen code that triggers warnings w/FORTIFY_SOURCE.
-Wno-stringop-truncation
dnl Fixing this requires ATTRIBUTE_FALLTHROUGH support at build time, but we
dnl don't have gnulib there (yet).
-Wno-implicit-fallthrough
dnl TODO Enable this after cleaning up code.
-Wno-shadow=local
"
case "${host}" in
*-*-mingw32*)
# Enable -Wno-format by default when using gcc on mingw since many
# GCC versions complain about %I64.
build_warnings="$build_warnings -Wno-format" ;;
*-*-solaris*)
# Solaris 11.4 <python2.7/ceval.h> uses #pragma no_inline that GCC
# doesn't understand.
build_warnings="$build_warnings -Wno-unknown-pragmas"
# Solaris 11 <unistd.h> marks vfork deprecated.
build_warnings="$build_warnings -Wno-deprecated-declarations" ;;
*)
# Note that gcc requires -Wformat for -Wformat-nonliteral to work,
# but there's a special case for this below.
build_warnings="$build_warnings -Wformat-nonliteral" ;;
esac
AC_ARG_ENABLE(build-warnings,
AS_HELP_STRING([--enable-build-warnings], [enable build-time compiler warnings if gcc is used]),
[case "${enableval}" in
yes) ;;
no) build_warnings="-w";;
,*) t=`echo "${enableval}" | sed -e "s/,/ /g"`
build_warnings="${build_warnings} ${t}";;
*,) t=`echo "${enableval}" | sed -e "s/,/ /g"`
build_warnings="${t} ${build_warnings}";;
*) build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
esac
if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
echo "Setting compiler warning flags = $build_warnings" 6>&1
fi])dnl
AC_ARG_ENABLE(sim-build-warnings,
AS_HELP_STRING([--enable-sim-build-warnings], [enable SIM specific build-time compiler warnings if gcc is used]),
[case "${enableval}" in
yes) ;;
no) build_warnings="-w";;
,*) t=`echo "${enableval}" | sed -e "s/,/ /g"`
build_warnings="${build_warnings} ${t}";;
*,) t=`echo "${enableval}" | sed -e "s/,/ /g"`
build_warnings="${t} ${build_warnings}";;
*) build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
esac
if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
echo "Setting GDB specific compiler warning flags = $build_warnings" 6>&1
fi])dnl
WARN_CFLAGS=""
BUILD_WARN_CFLAGS=""
if test "x${build_warnings}" != x -a "x$GCC" = xyes
then
AC_DEFUN([_SIM_TEST_ALL_WARNING_FLAGS], [dnl
AC_MSG_CHECKING(compiler warning flags)
# Separate out the -Werror flag as some files just cannot be
# compiled with it enabled.
for w in ${build_warnings}; do
case $w in
-Werr*) WERROR_CFLAGS=-Werror ;;
*) _SIM_TEST_WARNING_FLAG($w, [WARN_CFLAGS="${WARN_CFLAGS} $w"]) ;;
esac
done
AC_MSG_RESULT(${WARN_CFLAGS} ${WERROR_CFLAGS})
])
dnl Test the host flags.
_SIM_TEST_ALL_WARNING_FLAGS
dnl Test the build flags.
AS_IF([test "x$cross_compiling" = "xno"], [dnl
SAVE_WARN_CFLAGS=$WARN_CFLAGS
build_warnings=$build_build_warnings
_SIM_TEST_ALL_WARNING_FLAGS
BUILD_WARN_CFLAGS=$WARN_CFLAGS
WARN_CFLAGS=$SAVE_WARN_CFLAGS
BUILD_WERROR_CFLAGS=$WERROR_CFLAGS
])
dnl Test individual flags to export to dedicated variables.
m4_map([_SIM_EXPORT_WARNING_FLAG], m4_split(m4_normalize([
-Wno-shadow=local
-Wno-unused-but-set-variable
])))dnl
fi
])
dnl Test a warning flag $1 and execute $2 if it passes, else $3.
AC_DEFUN([_SIM_TEST_WARNING_FLAG], [dnl
dnl GCC does not complain about -Wno-unknown-warning. Invert
dnl and test -Wunknown-warning instead.
w="$1"
case $w in
-Wno-*)
wtest=`echo $w | sed 's/-Wno-/-W/g'` ;;
-Wformat-nonliteral)
dnl gcc requires -Wformat before -Wformat-nonliteral
dnl will work, so stick them together.
w="-Wformat $w"
wtest="$w"
;;
*)
wtest=$w ;;
esac
dnl Check whether GCC accepts it.
saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror $wtest"
AC_TRY_COMPILE([],[],$2,$3)
CFLAGS="$saved_CFLAGS"
])
dnl Export variable $1 to $2 for use in makefiles.
AC_DEFUN([_SIM_EXPORT_WARNING], [dnl
AS_VAR_SET($1, $2)
AC_SUBST($1)
])
dnl Test if $1 is a known warning flag, and export a variable for makefiles.
dnl If $1=-Wfoo, then SIM_CFLAG_WFOO will be set to -Wfoo if it's supported.
AC_DEFUN([_SIM_EXPORT_WARNING_FLAG], [dnl
AC_MSG_CHECKING([whether $1 is supported])
_SIM_TEST_WARNING_FLAG($1, [dnl
_SIM_EXPORT_WARNING([SIM_CFLAG]m4_toupper(m4_translit($1, [-= ], [__])), $1)
AC_MSG_RESULT(yes)
], [AC_MSG_RESULT(no)])
])
AC_SUBST(WARN_CFLAGS)
AC_SUBST(WERROR_CFLAGS)
AC_SUBST(BUILD_WARN_CFLAGS)
AC_SUBST(BUILD_WERROR_CFLAGS)
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