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1d506c26 1dnl Copyright (C) 1997-2024 Free Software Foundation, Inc.
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2dnl
3dnl This program is free software; you can redistribute it and/or modify
4dnl it under the terms of the GNU General Public License as published by
5dnl the Free Software Foundation; either version 3 of the License, or
6dnl (at your option) any later version.
7dnl
8dnl This program is distributed in the hope that it will be useful,
9dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
10dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11dnl GNU General Public License for more details.
12dnl
13dnl You should have received a copy of the GNU General Public License
14dnl along with this program. If not, see <http://www.gnu.org/licenses/>.
15dnl
16dnl --enable-build-warnings is for developers of the simulator.
17dnl it enables extra GCC specific warnings.
3c7666dc 18AC_DEFUN([SIM_AC_OPTION_WARNINGS], [dnl
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19AC_ARG_ENABLE(werror,
20 AS_HELP_STRING([--enable-werror], [treat compile warnings as errors]),
21 [case "${enableval}" in
22 yes | y) ERROR_ON_WARNING="yes" ;;
23 no | n) ERROR_ON_WARNING="no" ;;
24 *) AC_MSG_ERROR(bad value ${enableval} for --enable-werror) ;;
25 esac])
26
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27dnl Enable -Werror by default when using gcc. Turn it off for releases.
28if test "${GCC}" = yes -a -z "${ERROR_ON_WARNING}" && $development; then
982c3a65 29 ERROR_ON_WARNING=yes
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30fi
31
32WERROR_CFLAGS=""
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33if test "${ERROR_ON_WARNING}" = yes ; then
34 WERROR_CFLAGS="-Werror"
35fi
760b3e8b 36
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37dnl The options we'll try to enable.
38dnl NB: Kept somewhat in sync with gdbsupport/warnings.m4.
b0c06375 39build_warnings="-Wall -Wpointer-arith
58d38850 40-Wno-unused -Wunused-value -Wunused-variable -Wunused-function
7f6fa743 41-Wno-switch -Wno-char-subscripts
00383ba6 42-Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable
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43-Wno-sign-compare -Wno-error=maybe-uninitialized
44dnl C++ -Wno-mismatched-tags
45-Wno-error=deprecated-register
46dnl C++ -Wsuggest-override
3a4ee628 47-Wimplicit-fallthrough=5
95cd009f 48-Wduplicated-cond
f6c714d6 49-Wshadow=local
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50dnl C++ -Wdeprecated-copy
51dnl C++ -Wdeprecated-copy-dtor
52dnl C++ -Wredundant-move
7f6fa743 53-Wmissing-declarations
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54dnl C++ -Wstrict-null-sentinel
55"
56dnl Some extra warnings we use in the sim.
57build_warnings="$build_warnings
58-Wdeclaration-after-statement
59-Wdeprecated-non-prototype
60-Wimplicit-function-declaration
61-Wimplicit-int
62-Wincompatible-function-pointer-types
63-Wincompatible-pointer-types
2757c1c6 64-Wint-conversion
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65-Wmisleading-indentation
66-Wmissing-parameter-type
7f6fa743 67-Wmissing-prototypes
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68-Wold-style-declaration
69-Wold-style-definition
7f6fa743 70-Wpointer-sign
fa113bd9 71-Wreturn-mismatch
3744b73e 72-Wreturn-type
9f17cdda 73-Wshift-negative-value
2757c1c6 74-Wstrict-prototypes
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75dnl The cgen virtual insn logic involves enum conversions.
76dnl Disable until we can figure out how to make this work.
77-Wno-enum-conversion
7f6fa743 78"
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79build_build_warnings="
80dnl TODO Fix the sh/gencode.c which triggers a ton of these warnings.
81-Wno-missing-braces
82dnl TODO Figure out the igen code that triggers warnings w/FORTIFY_SOURCE.
83-Wno-stringop-truncation
84dnl Fixing this requires ATTRIBUTE_FALLTHROUGH support at build time, but we
85dnl don't have gnulib there (yet).
86-Wno-implicit-fallthrough
87dnl TODO Enable this after cleaning up code.
88-Wno-shadow=local
89"
760b3e8b 90
760b3e8b 91case "${host}" in
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92 *-*-mingw32*)
93 # Enable -Wno-format by default when using gcc on mingw since many
94 # GCC versions complain about %I64.
95 build_warnings="$build_warnings -Wno-format" ;;
96 *-*-solaris*)
97 # Solaris 11.4 <python2.7/ceval.h> uses #pragma no_inline that GCC
98 # doesn't understand.
99 build_warnings="$build_warnings -Wno-unknown-pragmas"
100 # Solaris 11 <unistd.h> marks vfork deprecated.
101 build_warnings="$build_warnings -Wno-deprecated-declarations" ;;
102 *)
103 # Note that gcc requires -Wformat for -Wformat-nonliteral to work,
104 # but there's a special case for this below.
105 build_warnings="$build_warnings -Wformat-nonliteral" ;;
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106esac
107
108AC_ARG_ENABLE(build-warnings,
109AS_HELP_STRING([--enable-build-warnings], [enable build-time compiler warnings if gcc is used]),
110[case "${enableval}" in
111 yes) ;;
112 no) build_warnings="-w";;
113 ,*) t=`echo "${enableval}" | sed -e "s/,/ /g"`
114 build_warnings="${build_warnings} ${t}";;
115 *,) t=`echo "${enableval}" | sed -e "s/,/ /g"`
116 build_warnings="${t} ${build_warnings}";;
117 *) build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
118esac
119if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
120 echo "Setting compiler warning flags = $build_warnings" 6>&1
121fi])dnl
122AC_ARG_ENABLE(sim-build-warnings,
123AS_HELP_STRING([--enable-sim-build-warnings], [enable SIM specific build-time compiler warnings if gcc is used]),
124[case "${enableval}" in
125 yes) ;;
126 no) build_warnings="-w";;
127 ,*) t=`echo "${enableval}" | sed -e "s/,/ /g"`
128 build_warnings="${build_warnings} ${t}";;
129 *,) t=`echo "${enableval}" | sed -e "s/,/ /g"`
130 build_warnings="${t} ${build_warnings}";;
131 *) build_warnings=`echo "${enableval}" | sed -e "s/,/ /g"`;;
132esac
133if test x"$silent" != x"yes" && test x"$build_warnings" != x""; then
134 echo "Setting GDB specific compiler warning flags = $build_warnings" 6>&1
135fi])dnl
136WARN_CFLAGS=""
435ad222 137BUILD_WARN_CFLAGS=""
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138if test "x${build_warnings}" != x -a "x$GCC" = xyes
139then
435ad222 140AC_DEFUN([_SIM_TEST_ALL_WARNING_FLAGS], [dnl
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141 AC_MSG_CHECKING(compiler warning flags)
142 # Separate out the -Werror flag as some files just cannot be
143 # compiled with it enabled.
144 for w in ${build_warnings}; do
145 case $w in
146 -Werr*) WERROR_CFLAGS=-Werror ;;
4da6be3f 147 *) _SIM_TEST_WARNING_FLAG($w, [WARN_CFLAGS="${WARN_CFLAGS} $w"]) ;;
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148 esac
149 done
150 AC_MSG_RESULT(${WARN_CFLAGS} ${WERROR_CFLAGS})
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151])
152
153 dnl Test the host flags.
154 _SIM_TEST_ALL_WARNING_FLAGS
155
156 dnl Test the build flags.
157 AS_IF([test "x$cross_compiling" = "xno"], [dnl
158 SAVE_WARN_CFLAGS=$WARN_CFLAGS
159 build_warnings=$build_build_warnings
160 _SIM_TEST_ALL_WARNING_FLAGS
161 BUILD_WARN_CFLAGS=$WARN_CFLAGS
162 WARN_CFLAGS=$SAVE_WARN_CFLAGS
163 BUILD_WERROR_CFLAGS=$WERROR_CFLAGS
164 ])
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165
166 dnl Test individual flags to export to dedicated variables.
167 m4_map([_SIM_EXPORT_WARNING_FLAG], m4_split(m4_normalize([
168 -Wno-shadow=local
169 -Wno-unused-but-set-variable
170 ])))dnl
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171fi
172])
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173dnl Test a warning flag $1 and execute $2 if it passes, else $3.
174AC_DEFUN([_SIM_TEST_WARNING_FLAG], [dnl
175 dnl GCC does not complain about -Wno-unknown-warning. Invert
176 dnl and test -Wunknown-warning instead.
177 w="$1"
178 case $w in
179 -Wno-*)
180 wtest=`echo $w | sed 's/-Wno-/-W/g'` ;;
181 -Wformat-nonliteral)
182 dnl gcc requires -Wformat before -Wformat-nonliteral
183 dnl will work, so stick them together.
184 w="-Wformat $w"
185 wtest="$w"
186 ;;
187 *)
188 wtest=$w ;;
189 esac
190
191 dnl Check whether GCC accepts it.
192 saved_CFLAGS="$CFLAGS"
193 CFLAGS="$CFLAGS -Werror $wtest"
194 AC_TRY_COMPILE([],[],$2,$3)
195 CFLAGS="$saved_CFLAGS"
196])
197dnl Export variable $1 to $2 for use in makefiles.
198AC_DEFUN([_SIM_EXPORT_WARNING], [dnl
199 AS_VAR_SET($1, $2)
200 AC_SUBST($1)
201])
202dnl Test if $1 is a known warning flag, and export a variable for makefiles.
203dnl If $1=-Wfoo, then SIM_CFLAG_WFOO will be set to -Wfoo if it's supported.
204AC_DEFUN([_SIM_EXPORT_WARNING_FLAG], [dnl
205 AC_MSG_CHECKING([whether $1 is supported])
206 _SIM_TEST_WARNING_FLAG($1, [dnl
207 _SIM_EXPORT_WARNING([SIM_CFLAG]m4_toupper(m4_translit($1, [-= ], [__])), $1)
208 AC_MSG_RESULT(yes)
209 ], [AC_MSG_RESULT(no)])
210])
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211AC_SUBST(WARN_CFLAGS)
212AC_SUBST(WERROR_CFLAGS)
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213AC_SUBST(BUILD_WARN_CFLAGS)
214AC_SUBST(BUILD_WERROR_CFLAGS)