[RISC-V][PR target/116590] Avoid emitting multiple instructions from fmacc patterns
[gcc.git] / contrib / check_warning_flags.sh
blob0f2f669a24d7d5a49179018f5469dab5607b2160
1 #! /bin/sh
3 # Check that the warning flags documented in invoke.texi match up
4 # with what the compiler accepts.
6 # Copyright (C) 2008-2024 Free Software Foundation, Inc.
7 # Written by Ralf Wildenhues <Ralf.Wildenhues@gmx.de>.
9 # This script is Free Software, and it can be copied, distributed and
10 # modified as defined in the GNU General Public License. A copy of
11 # its license can be downloaded from http://www.gnu.org/copyleft/gpl.html
13 # Call this script as
14 # check_warning_flags.sh path/to/invoke.texi
15 # with CC set to the compiler to be tested.
16 # The script scribbles in the current directory.
18 progname=`echo "$0" | sed 's,.*/,,'`
19 usage ()
21 echo "usage: $progname path/to/gcc/doc"
22 echo "set \$CC to the compiler to be checked"
23 exit 1
26 ret=0
27 LC_ALL=C
28 export LC_ALL
29 : ${CC=gcc}
30 test $# = 1 || usage
31 gcc_docdir=$1
32 invoke_texi=$gcc_docdir/invoke.texi
33 test -r "$invoke_texi" || {
34 echo "$progname: error: cannot read '$invoke_texi'" >&2
35 usage
37 filebase=check_warning_flags_file$$
38 stderr=check_warning_flags_stderr$$
40 remove_problematic_flags='
41 /-Wlarger-than-/d
42 /-Wframe-larger-than/d
43 /-Wdisallowed-function-list/d
44 /-W[alp],/d
45 /-Werror/d
46 /-Wpadded/d
47 /pedantic-ms-format/d
48 /=/d'
50 # Ensure that indexed warnings are accepted.
51 set x `sed '/^@opindex W/{
52 s/^@opindex /-/
53 '"$remove_problematic_flags"'
54 /-W[alp]$/d
57 d' <"$invoke_texi"`
58 shift
59 : >$filebase.c
60 $CC -c $filebase.c "$@" 2>&1 |
61 grep -v 'command line option.*is valid for.*but not for' >$stderr
62 if test -s $stderr; then
63 echo "options listed in @opindex but not accepted by the compiler:" >&2
64 cat $stderr >&2
65 ret=1
67 rm -f $filebase.c $stderr
69 # Check documentation of warning options.
70 for lang in c c++ objc obj-c++; do
71 case $lang in
72 c) ext=c; langmatch='[^-]C[^+].*only' ;;
73 c++) ext=C; langmatch='[^-]C++.*only' ;;
74 objc) ext=m; langmatch='Objective-C[^+].*only' ;;
75 obj-c++) ext=M; langmatch='Objective-C++.*only' ;;
76 esac
77 file=$filebase.$ext
78 : >$file
79 $CC -c $file 2>$stderr
80 if grep 'not installed on this system' $stderr >/dev/null ||
81 grep 'installation problem, cannot exec' $stderr >/dev/null ||
82 grep 'error trying to exec' $stderr >/dev/null
83 then
84 echo "$progname: $CC is not configured for language $lang, skipping checks" >&2
85 rm -f $file $filebase.o $filebase.obj $stderr
86 continue
89 # Verify good warning flags.
90 set x `sed '
91 t a
93 /^@item -W/{
94 /'"$langmatch"'/b x
95 / only)/d
96 b x
100 '"$remove_problematic_flags"'
101 s/^@item //
102 s/ .*//
103 ' <"$invoke_texi"`
104 shift
105 $CC -c $file -O "$@" 2>$stderr
106 if test -s $stderr; then
107 echo failures: >&2
108 cat $stderr >&2
109 ret=1
112 # Verify bad warning flags.
113 set x `sed '
116 /^@item -W/{
117 / only)/!d
118 /'"$langmatch"'/d
123 '"$remove_problematic_flags"'
124 s/^@item //
125 s/ .*//
126 ' <"$invoke_texi"`
127 shift
128 $CC -c $file -O "$@" 2>$stderr
129 # cat $stderr >&2
130 test $# = `grep 'command line option.*valid.*but not for' <$stderr | wc -l` || {
131 for warning
133 grep "command line option.*$warning.*valid" <$stderr >&2 ||
134 echo "valid for $lang but not annotated as such: $warning"
135 done
136 ret=1
138 rm -f $file $filebase.o $filebase.obj $stderr
139 done
142 remove_problematic_help_flags='
143 /^W$/d
144 /^W[alp]$/d
145 /^Werror-implicit-function-declaration$/d
146 /^Wsynth$/d
147 /-$/d
148 /=/d'
149 help_flags=`
150 $CC --help -v 2>/dev/null | tr ' ' '\012' |
151 sed -n '
154 s/^-\(W[^<,]*\).*/\1/
158 '"$remove_problematic_help_flags"'
159 p' | sort -u`
160 : >$filebase.c
161 for flag in $help_flags; do
162 $CC -c $filebase.c -$flag 2>/dev/null || {
163 echo "warning -$flag not supported" >&2
164 ret=1
166 grep "@item.*$flag" $gcc_docdir/../*/*.texi >/dev/null || {
167 # For @item, we are satisfied with either -Wfoo or -Wno-foo.
168 inverted_flag=`echo "$flag" | sed '
169 s/^Wno-/W/
171 s/^W/Wno-/'`
172 grep "@item.*$inverted_flag" $gcc_docdir/../*/*.texi >/dev/null || {
173 echo "warning -$flag not documented in $gcc_docdir/../*/*.texi" >&2
174 ret=1
177 done
178 rm -f $filebase.c $filebase.o
180 exit $ret