unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob a3d255a9402b4d6c93b3e8a9e07d158a4788331a 9508 bytes (raw)
name: m4/manywarnings.m4 	 # note: path name is non-authoritative(*)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
 
# manywarnings.m4 serial 11
dnl Copyright (C) 2008-2017 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 Simon Josefsson

# gl_MANYWARN_COMPLEMENT(OUTVAR, LISTVAR, REMOVEVAR)
# --------------------------------------------------
# Copy LISTVAR to OUTVAR except for the entries in REMOVEVAR.
# Elements separated by whitespace.  In set logic terms, the function
# does OUTVAR = LISTVAR \ REMOVEVAR.
AC_DEFUN([gl_MANYWARN_COMPLEMENT],
[
  gl_warn_set=
  set x $2; shift
  for gl_warn_item
  do
    case " $3 " in
      *" $gl_warn_item "*)
        ;;
      *)
        gl_warn_set="$gl_warn_set $gl_warn_item"
        ;;
    esac
  done
  $1=$gl_warn_set
])

# gl_MANYWARN_ALL_GCC(VARIABLE)
# -----------------------------
# Add all documented GCC warning parameters to variable VARIABLE.
# Note that you need to test them using gl_WARN_ADD if you want to
# make sure your gcc understands it.
#
# The effects of this macro depend on the current language (_AC_LANG).
AC_DEFUN([gl_MANYWARN_ALL_GCC],
[_AC_LANG_DISPATCH([$0], _AC_LANG, $@)])

# Specialization for _AC_LANG = C.
AC_DEFUN([gl_MANYWARN_ALL_GCC(C)],
[
  AC_LANG_PUSH([C])

  dnl First, check for some issues that only occur when combining multiple
  dnl gcc warning categories.
  AC_REQUIRE([AC_PROG_CC])
  if test -n "$GCC"; then

    dnl Check if -W -Werror -Wno-missing-field-initializers is supported
    dnl with the current $CC $CFLAGS $CPPFLAGS.
    AC_MSG_CHECKING([whether -Wno-missing-field-initializers is supported])
    AC_CACHE_VAL([gl_cv_cc_nomfi_supported], [
      gl_save_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS -W -Werror -Wno-missing-field-initializers"
      AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM([[]], [[]])],
        [gl_cv_cc_nomfi_supported=yes],
        [gl_cv_cc_nomfi_supported=no])
      CFLAGS="$gl_save_CFLAGS"])
    AC_MSG_RESULT([$gl_cv_cc_nomfi_supported])

    if test "$gl_cv_cc_nomfi_supported" = yes; then
      dnl Now check whether -Wno-missing-field-initializers is needed
      dnl for the { 0, } construct.
      AC_MSG_CHECKING([whether -Wno-missing-field-initializers is needed])
      AC_CACHE_VAL([gl_cv_cc_nomfi_needed], [
        gl_save_CFLAGS="$CFLAGS"
        CFLAGS="$CFLAGS -W -Werror"
        AC_COMPILE_IFELSE(
          [AC_LANG_PROGRAM(
             [[int f (void)
               {
                 typedef struct { int a; int b; } s_t;
                 s_t s1 = { 0, };
                 return s1.b;
               }
             ]],
             [[]])],
          [gl_cv_cc_nomfi_needed=no],
          [gl_cv_cc_nomfi_needed=yes])
        CFLAGS="$gl_save_CFLAGS"
      ])
      AC_MSG_RESULT([$gl_cv_cc_nomfi_needed])
    fi

    dnl Next, check if -Werror -Wuninitialized is useful with the
    dnl user's choice of $CFLAGS; some versions of gcc warn that it
    dnl has no effect if -O is not also used
    AC_MSG_CHECKING([whether -Wuninitialized is supported])
    AC_CACHE_VAL([gl_cv_cc_uninitialized_supported], [
      gl_save_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS -Werror -Wuninitialized"
      AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM([[]], [[]])],
        [gl_cv_cc_uninitialized_supported=yes],
        [gl_cv_cc_uninitialized_supported=no])
      CFLAGS="$gl_save_CFLAGS"])
    AC_MSG_RESULT([$gl_cv_cc_uninitialized_supported])

  fi

  # List all gcc warning categories.
  # To compare this list to your installed GCC's, run this Bash command:
  #
  # comm -3 \
  #  <(sed -n 's/^  *\(-[^ ]*\) .*/\1/p' manywarnings.m4 | sort) \
  #  <(gcc --help=warnings | sed -n 's/^  \(-[^ ]*\) .*/\1/p' | sort |
  #      grep -v -x -F -f <(
  #         awk '/^[^#]/ {print $1}' ../build-aux/gcc-warning.spec))

  gl_manywarn_set=
  for gl_manywarn_item in -fno-common \
    -W \
    -Wabi \
    -Waddress \
    -Waggressive-loop-optimizations \
    -Wall \
    -Wattributes \
    -Wbad-function-cast \
    -Wbool-compare \
    -Wbool-operation \
    -Wbuiltin-declaration-mismatch \
    -Wbuiltin-macro-redefined \
    -Wcast-align \
    -Wchar-subscripts \
    -Wchkp \
    -Wclobbered \
    -Wcomment \
    -Wcomments \
    -Wcoverage-mismatch \
    -Wcpp \
    -Wdangling-else \
    -Wdate-time \
    -Wdeprecated \
    -Wdeprecated-declarations \
    -Wdesignated-init \
    -Wdisabled-optimization \
    -Wdiscarded-array-qualifiers \
    -Wdiscarded-qualifiers \
    -Wdiv-by-zero \
    -Wdouble-promotion \
    -Wduplicated-branches \
    -Wduplicated-cond \
    -Wduplicate-decl-specifier \
    -Wempty-body \
    -Wendif-labels \
    -Wenum-compare \
    -Wexpansion-to-defined \
    -Wextra \
    -Wformat-contains-nul \
    -Wformat-extra-args \
    -Wformat-nonliteral \
    -Wformat-security \
    -Wformat-signedness \
    -Wformat-y2k \
    -Wformat-zero-length \
    -Wframe-address \
    -Wfree-nonheap-object \
    -Whsa \
    -Wignored-attributes \
    -Wignored-qualifiers \
    -Wimplicit \
    -Wimplicit-function-declaration \
    -Wimplicit-int \
    -Wincompatible-pointer-types \
    -Winit-self \
    -Winline \
    -Wint-conversion \
    -Wint-in-bool-context \
    -Wint-to-pointer-cast \
    -Winvalid-memory-model \
    -Winvalid-pch \
    -Wjump-misses-init \
    -Wlogical-not-parentheses \
    -Wlogical-op \
    -Wmain \
    -Wmaybe-uninitialized \
    -Wmemset-elt-size \
    -Wmemset-transposed-args \
    -Wmisleading-indentation \
    -Wmissing-braces \
    -Wmissing-declarations \
    -Wmissing-field-initializers \
    -Wmissing-include-dirs \
    -Wmissing-parameter-type \
    -Wmissing-prototypes \
    -Wmultichar \
    -Wnarrowing \
    -Wnested-externs \
    -Wnonnull \
    -Wnonnull-compare \
    -Wnull-dereference \
    -Wodr \
    -Wold-style-declaration \
    -Wold-style-definition \
    -Wopenmp-simd \
    -Woverflow \
    -Woverlength-strings \
    -Woverride-init \
    -Wpacked \
    -Wpacked-bitfield-compat \
    -Wparentheses \
    -Wpointer-arith \
    -Wpointer-compare \
    -Wpointer-sign \
    -Wpointer-to-int-cast \
    -Wpragmas \
    -Wpsabi \
    -Wrestrict \
    -Wreturn-local-addr \
    -Wreturn-type \
    -Wscalar-storage-order \
    -Wsequence-point \
    -Wshadow \
    -Wshift-count-negative \
    -Wshift-count-overflow \
    -Wshift-negative-value \
    -Wsizeof-array-argument \
    -Wsizeof-pointer-memaccess \
    -Wstack-protector \
    -Wstrict-aliasing \
    -Wstrict-overflow \
    -Wstrict-prototypes \
    -Wsuggest-attribute=const \
    -Wsuggest-attribute=format \
    -Wsuggest-attribute=noreturn \
    -Wsuggest-attribute=pure \
    -Wsuggest-final-methods \
    -Wsuggest-final-types \
    -Wswitch \
    -Wswitch-bool \
    -Wswitch-default \
    -Wswitch-unreachable \
    -Wsync-nand \
    -Wsystem-headers \
    -Wtautological-compare \
    -Wtrampolines \
    -Wtrigraphs \
    -Wtype-limits \
    -Wuninitialized \
    -Wunknown-pragmas \
    -Wunsafe-loop-optimizations \
    -Wunused \
    -Wunused-but-set-parameter \
    -Wunused-but-set-variable \
    -Wunused-function \
    -Wunused-label \
    -Wunused-local-typedefs \
    -Wunused-macros \
    -Wunused-parameter \
    -Wunused-result \
    -Wunused-value \
    -Wunused-variable \
    -Wvarargs \
    -Wvariadic-macros \
    -Wvector-operation-performance \
    -Wvla \
    -Wvolatile-register-var \
    -Wwrite-strings \
    \
    ; do
    gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
  done

  # gcc --help=warnings outputs an unusual form for these options; list
  # them here so that the above 'comm' command doesn't report a false match.
  # Would prefer "min (PTRDIFF_MAX, SIZE_MAX)", but it must be a literal
  # and AC_COMPUTE_INT requires it to fit in a long:
  AC_MSG_CHECKING([max safe object size])
  AC_COMPUTE_INT([gl_alloc_max],
    [(LONG_MAX < PTRDIFF_MAX ? LONG_MAX : PTRDIFF_MAX) < (size_t) -1
     ? (LONG_MAX < PTRDIFF_MAX ? LONG_MAX : PTRDIFF_MAX)
     : (size_t) -1],
    [[#include <limits.h>
      #include <stddef.h>
      #include <stdint.h>
    ]],
    [gl_alloc_max=2147483647])
  AC_MSG_RESULT([$gl_alloc_max])
  gl_manywarn_set="$gl_manywarn_set -Walloc-size-larger-than=$gl_alloc_max"
  gl_manywarn_set="$gl_manywarn_set -Warray-bounds=2"
  gl_manywarn_set="$gl_manywarn_set -Wformat-overflow=2"
  gl_manywarn_set="$gl_manywarn_set -Wformat-truncation=2"
  gl_manywarn_set="$gl_manywarn_set -Wimplicit-fallthrough=5"
  gl_manywarn_set="$gl_manywarn_set -Wnormalized=nfc"
  gl_manywarn_set="$gl_manywarn_set -Wshift-overflow=2"
  gl_manywarn_set="$gl_manywarn_set -Wstringop-overflow=2"
  gl_manywarn_set="$gl_manywarn_set -Wunused-const-variable=2"
  gl_manywarn_set="$gl_manywarn_set -Wvla-larger-than=4031"

  # These are needed for older GCC versions.
  if test -n "$GCC"; then
    case `($CC --version) 2>/dev/null` in
      'gcc (GCC) '[[0-3]].* | \
      'gcc (GCC) '4.[[0-7]].*)
        gl_manywarn_set="$gl_manywarn_set -fdiagnostics-show-option"
        gl_manywarn_set="$gl_manywarn_set -funit-at-a-time"
          ;;
    esac
  fi

  # Disable specific options as needed.
  if test "$gl_cv_cc_nomfi_needed" = yes; then
    gl_manywarn_set="$gl_manywarn_set -Wno-missing-field-initializers"
  fi

  if test "$gl_cv_cc_uninitialized_supported" = no; then
    gl_manywarn_set="$gl_manywarn_set -Wno-uninitialized"
  fi

  $1=$gl_manywarn_set

  AC_LANG_POP([C])
])

# Specialization for _AC_LANG = C++.
AC_DEFUN([gl_MANYWARN_ALL_GCC(C++)],
[
  gl_MANYWARN_ALL_GCC_CXX_IMPL([$1])
])

debug log:

solving a3d255a940 ...
found a3d255a940 in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).