git.m6w6.name Git - m6w6/libmemcached/blob - m4/ax_harden_compiler_flags.m4

   1 # ===========================================================================
   2 #      https://github.com/BrianAker/ddm4/
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_HARDEN_COMPILER_FLAGS() AX_HARDEN_LINKER_FLAGS()
   8 #
   9 # DESCRIPTION
  10 #
  11 #   Any compiler flag that "hardens" or tests code. C99 is assumed.
  12 #
  13 #   NOTE: Implementation based on AX_APPEND_FLAG.
  14 #
  15 # LICENSE
  16 #
  17 #  Copyright (C) 2012 Brian Aker
  18 #  All rights reserved.
  19 #
  20 #  Redistribution and use in source and binary forms, with or without
  21 #  modification, are permitted provided that the following conditions are
  22 #  met:
  23 #
  24 #      * Redistributions of source code must retain the above copyright
  25 #  notice, this list of conditions and the following disclaimer.
  26 #
  27 #      * Redistributions in binary form must reproduce the above
  28 #  copyright notice, this list of conditions and the following disclaimer
  29 #  in the documentation and/or other materials provided with the
  30 #  distribution.
  31 #
  32 #      * The names of its contributors may not be used to endorse or
  33 #  promote products derived from this software without specific prior
  34 #  written permission.
  35 #
  36 #  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  37 #  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  38 #  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  39 #  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  40 #  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41 #  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  42 #  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  43 #  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  44 #  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  45 #  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  46 #  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  47
  48 # The Following flags are not checked for
  49 # -Wdeclaration-after-statement is counter to C99
  50 # _APPEND_COMPILE_FLAGS_ERROR([-std=c++11]) -- Not ready yet
  51 # _APPEND_COMPILE_FLAGS_ERROR([-pedantic]) --
  52 # ?  _APPEND_COMPILE_FLAGS_ERROR([-Wlong-long]) -- Don't turn on for
  53 # compatibility issues memcached_stat_st
  54
  55 #serial 7
  56
  57 AC_DEFUN([_WARNINGS_AS_ERRORS],
  58     [AC_CACHE_CHECK([if all warnings into errors],[ac_cv_warnings_as_errors],
  59       [AS_IF([test "x$ac_cv_vcs_checkout" = xyes],[ac_cv_warnings_as_errors=yes],
  60         [ac_cv_warnings_as_errors=no])
  61       ])
  62     ])
  63
  64 # Note: Should this be LIBS or LDFLAGS?
  65 AC_DEFUN([_APPEND_LINK_FLAGS_ERROR],
  66          [AC_REQUIRE([AX_APPEND_LINK_FLAGS])
  67          AX_APPEND_LINK_FLAGS([$1],[LDFLAGS],[-Werror])
  68          ])
  69
  70 AC_DEFUN([_APPEND_COMPILE_FLAGS_ERROR],
  71          [AC_REQUIRE([AX_APPEND_COMPILE_FLAGS])
  72          AX_APPEND_COMPILE_FLAGS([$1],,[-Werror])
  73          ])
  74
  75 # Everything above this does the heavy lifting, while what follows does the specifics.
  76
  77 AC_DEFUN([_HARDEN_LINKER_FLAGS],
  78          [_APPEND_LINK_FLAGS_ERROR([-z relro -z now])
  79          #_APPEND_LINK_FLAGS_ERROR([-pie])
  80          AS_IF([test "x$ac_cv_warnings_as_errors" = xyes],
  81                [AX_APPEND_LINK_FLAGS([-Werror])])
  82          ])
  83
  84 AC_DEFUN([_HARDEN_CC_COMPILER_FLAGS],
  85          [AC_LANG_PUSH([C])dnl
  86
  87          AS_IF([test "x$ax_enable_debug" = xyes],
  88            [CFLAGS=''
  89            _APPEND_COMPILE_FLAGS_ERROR([-ggdb])
  90            _APPEND_COMPILE_FLAGS_ERROR([-g])
  91            _APPEND_COMPILE_FLAGS_ERROR([-O0])],
  92            [_APPEND_COMPILE_FLAGS_ERROR([-g])
  93            _APPEND_COMPILE_FLAGS_ERROR([-O2])])
  94
  95          AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
  96            [_APPEND_COMPILE_FLAGS_ERROR([-fstack-check])],
  97            [_APPEND_COMPILE_FLAGS_ERROR([-Wno-pragmas])])
  98
  99          _APPEND_COMPILE_FLAGS_ERROR([-Wall])
 100          _APPEND_COMPILE_FLAGS_ERROR([-Wextra])
 101          _APPEND_COMPILE_FLAGS_ERROR([-Wunknown-pragmas])
 102          _APPEND_COMPILE_FLAGS_ERROR([-Wthis-test-should-fail])
 103          _APPEND_COMPILE_FLAGS_ERROR([-std=c99])
 104 # Anything below this comment please keep sorted.
 105          _APPEND_COMPILE_FLAGS_ERROR([--param=ssp-buffer-size=1])
 106 # _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-format-attribute])
 107           _APPEND_COMPILE_FLAGS_ERROR([-Wno-attributes])
 108           _APPEND_COMPILE_FLAGS_ERROR([-Waddress])
 109           _APPEND_COMPILE_FLAGS_ERROR([-Warray-bounds])
 110           _APPEND_COMPILE_FLAGS_ERROR([-Wbad-function-cast])
 111 # Not in use -Wc++-compat
 112           _APPEND_COMPILE_FLAGS_ERROR([-Wchar-subscripts])
 113           _APPEND_COMPILE_FLAGS_ERROR([-Wcomment])
 114           _APPEND_COMPILE_FLAGS_ERROR([-Wfloat-equal])
 115           _APPEND_COMPILE_FLAGS_ERROR([-Wformat-security])
 116           _APPEND_COMPILE_FLAGS_ERROR([-Wformat=2])
 117           _APPEND_COMPILE_FLAGS_ERROR([-Wlogical-op])
 118           _APPEND_COMPILE_FLAGS_ERROR([-Wmaybe-uninitialized])
 119           _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-field-initializers])
 120           AS_IF([test "x$MINGW" = xyes],
 121                 [_APPEND_COMPILE_FLAGS_ERROR([-Wno-missing-noreturn])],
 122                 [_APPEND_COMPILE_FLAGS_ERROR([-Wmissing-noreturn])])
 123           _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-prototypes])
 124           _APPEND_COMPILE_FLAGS_ERROR([-Wnested-externs])
 125           _APPEND_COMPILE_FLAGS_ERROR([-Wnormalized=id])
 126           _APPEND_COMPILE_FLAGS_ERROR([-Wold-style-definition])
 127           _APPEND_COMPILE_FLAGS_ERROR([-Woverride-init])
 128           _APPEND_COMPILE_FLAGS_ERROR([-Wpointer-arith])
 129           _APPEND_COMPILE_FLAGS_ERROR([-Wpointer-sign])
 130           AS_IF([test "x$MINGW" = xyes],
 131                 [_APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=const])
 132                 _APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=noreturn])
 133                 _APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=pure])
 134                 _APPEND_COMPILE_FLAGS_ERROR([-Wno-redundant-decls])],
 135                 [_APPEND_COMPILE_FLAGS_ERROR([-Wredundant-decls])])
 136
 137           _APPEND_COMPILE_FLAGS_ERROR([-Wshadow])
 138           _APPEND_COMPILE_FLAGS_ERROR([-Wshorten-64-to-32])
 139           _APPEND_COMPILE_FLAGS_ERROR([-Wsign-compare])
 140           _APPEND_COMPILE_FLAGS_ERROR([-Wstrict-overflow=1])
 141           _APPEND_COMPILE_FLAGS_ERROR([-Wstrict-prototypes])
 142           _APPEND_COMPILE_FLAGS_ERROR([-Wswitch-enum])
 143           _APPEND_COMPILE_FLAGS_ERROR([-Wundef])
 144           _APPEND_COMPILE_FLAGS_ERROR([-Wunused])
 145           _APPEND_COMPILE_FLAGS_ERROR([-Wunused-result])
 146           _APPEND_COMPILE_FLAGS_ERROR([-Wunused-variable])
 147           _APPEND_COMPILE_FLAGS_ERROR([-Wwrite-strings])
 148           _APPEND_COMPILE_FLAGS_ERROR([-floop-parallelize-all])
 149           _APPEND_COMPILE_FLAGS_ERROR([-fwrapv])
 150           _APPEND_COMPILE_FLAGS_ERROR([-fmudflapt])
 151           _APPEND_COMPILE_FLAGS_ERROR([-pipe])
 152
 153           AS_IF([test "x$ax_enable_debug" = xno],
 154             [AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
 155               [AS_IF([test "x${target_os}" != "xmingw"],
 156                 [AS_IF([test "x$ac_c_gcc_recent" = xyes],
 157                   [_APPEND_COMPILE_FLAGS_ERROR([-D_FORTIFY_SOURCE=2])
 158                   #_APPEND_COMPILE_FLAGS_ERROR([-Wstack-protector])
 159                   #_APPEND_COMPILE_FLAGS_ERROR([-fstack-protector])
 160                   _APPEND_COMPILE_FLAGS_ERROR([-fstack-protector-all])
 161                   ])])])])
 162
 163          AS_IF([test "x$ac_cv_warnings_as_errors" = xyes],
 164              [AX_APPEND_FLAG([-Werror])])
 165
 166           AC_LANG_POP([C])
 167   ])
 168
 169 AC_DEFUN([_HARDEN_CXX_COMPILER_FLAGS],
 170          [AC_LANG_PUSH([C++])
 171          AC_REQUIRE([_APPEND_COMPILE_FLAGS_ERROR])
 172
 173          AS_IF([test "x$ax_enable_debug" = xyes],
 174            [CXXFLAGS=''
 175            _APPEND_COMPILE_FLAGS_ERROR([-ggdb])
 176            _APPEND_COMPILE_FLAGS_ERROR([-g])
 177            _APPEND_COMPILE_FLAGS_ERROR([-O0])],
 178            [_APPEND_COMPILE_FLAGS_ERROR([-g])
 179            _APPEND_COMPILE_FLAGS_ERROR([-O2])])
 180
 181          AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
 182            [_APPEND_COMPILE_FLAGS_ERROR([-fstack-check])],
 183            [_APPEND_COMPILE_FLAGS_ERROR([-Wno-pragmas])])
 184
 185          _APPEND_COMPILE_FLAGS_ERROR([-Wall])
 186          _APPEND_COMPILE_FLAGS_ERROR([-Wextra])
 187          _APPEND_COMPILE_FLAGS_ERROR([-Wunknown-pragmas])
 188          _APPEND_COMPILE_FLAGS_ERROR([-Wthis-test-should-fail])
 189 # Anything below this comment please keep sorted.
 190          _APPEND_COMPILE_FLAGS_ERROR([--param=ssp-buffer-size=1])
 191 # _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-format-attribute])
 192           _APPEND_COMPILE_FLAGS_ERROR([-Wno-attributes])
 193           _APPEND_COMPILE_FLAGS_ERROR([-Waddress])
 194           _APPEND_COMPILE_FLAGS_ERROR([-Warray-bounds])
 195           _APPEND_COMPILE_FLAGS_ERROR([-Wchar-subscripts])
 196           _APPEND_COMPILE_FLAGS_ERROR([-Wcomment])
 197           _APPEND_COMPILE_FLAGS_ERROR([-Wctor-dtor-privacy])
 198           _APPEND_COMPILE_FLAGS_ERROR([-Wfloat-equal])
 199           _APPEND_COMPILE_FLAGS_ERROR([-Wformat=2])
 200           _APPEND_COMPILE_FLAGS_ERROR([-Wmaybe-uninitialized])
 201           _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-field-initializers])
 202           _APPEND_COMPILE_FLAGS_ERROR([-Wlogical-op])
 203           _APPEND_COMPILE_FLAGS_ERROR([-Wnon-virtual-dtor])
 204           _APPEND_COMPILE_FLAGS_ERROR([-Wnormalized=id])
 205           _APPEND_COMPILE_FLAGS_ERROR([-Woverloaded-virtual])
 206           _APPEND_COMPILE_FLAGS_ERROR([-Wpointer-arith])
 207           AS_IF([test "x$MINGW" = xyes],
 208                 [_APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=const])
 209                 _APPEND_COMPILE_FLAGS_ERROR([-Wno-missing-noreturn])
 210                 _APPEND_COMPILE_FLAGS_ERROR([-Wmissing-noreturn])
 211                 _APPEND_COMPILE_FLAGS_ERROR([-Wno-suggest-attribute=noreturn])
 212                 _APPEND_COMPILE_FLAGS_ERROR([-Wno-error=suggest-attribute=noreturn])
 213                 _APPEND_COMPILE_FLAGS_ERROR([-Wno-redundant-decls])],
 214                 [_APPEND_COMPILE_FLAGS_ERROR([-Wredundant-decls])])
 215           _APPEND_COMPILE_FLAGS_ERROR([-Wshadow])
 216           _APPEND_COMPILE_FLAGS_ERROR([-Wshorten-64-to-32])
 217           _APPEND_COMPILE_FLAGS_ERROR([-Wsign-compare])
 218           _APPEND_COMPILE_FLAGS_ERROR([-Wstrict-overflow=1])
 219           _APPEND_COMPILE_FLAGS_ERROR([-Wswitch-enum])
 220           _APPEND_COMPILE_FLAGS_ERROR([-Wundef])
 221           _APPEND_COMPILE_FLAGS_ERROR([-Wc++11-compat])
 222           _APPEND_COMPILE_FLAGS_ERROR([-Wunused])
 223           _APPEND_COMPILE_FLAGS_ERROR([-Wunused-result])
 224           _APPEND_COMPILE_FLAGS_ERROR([-Wunused-variable])
 225           _APPEND_COMPILE_FLAGS_ERROR([-Wwrite-strings])
 226           _APPEND_COMPILE_FLAGS_ERROR([-Wformat-security])
 227           _APPEND_COMPILE_FLAGS_ERROR([-floop-parallelize-all])
 228           _APPEND_COMPILE_FLAGS_ERROR([-fwrapv])
 229           _APPEND_COMPILE_FLAGS_ERROR([-fmudflapt])
 230           _APPEND_COMPILE_FLAGS_ERROR([-pipe])
 231
 232           AS_IF([test "x$ax_enable_debug" = xno],
 233           [AS_IF([test "x$ac_cv_vcs_checkout" = xyes],
 234             [AS_IF([test "x${target_os}" != "xmingw"],
 235               [AS_IF([test "x$ac_c_gcc_recent" = xyes],
 236                 [_APPEND_COMPILE_FLAGS_ERROR([-D_FORTIFY_SOURCE=2])
 237                 #_APPEND_COMPILE_FLAGS_ERROR([-Wstack-protector])
 238                 #_APPEND_COMPILE_FLAGS_ERROR([-fstack-protector])
 239                 _APPEND_COMPILE_FLAGS_ERROR([-fstack-protector-all])
 240                 ])])])])
 241
 242           AS_IF([test "x$ac_cv_warnings_as_errors" = xyes],
 243                 [AX_APPEND_FLAG([-Werror])])
 244           AC_LANG_POP([C++])
 245   ])
 246
 247 # All of the heavy lifting happens in _HARDEN_LINKER_FLAGS,
 248 # _HARDEN_CC_COMPILER_FLAGS, _HARDEN_CXX_COMPILER_FLAGS
 249   AC_DEFUN([AX_HARDEN_COMPILER_FLAGS],
 250            [AC_PREREQ([2.63])dnl
 251            AC_REQUIRE([_WARNINGS_AS_ERRORS])
 252            AC_REQUIRE([AX_APPEND_LINK_FLAGS])
 253            AC_REQUIRE([AX_COMPILER_VERSION])
 254            AC_REQUIRE([AX_DEBUG])
 255            AC_REQUIRE([AX_VCS_CHECKOUT])
 256
 257            AC_REQUIRE([gl_VISIBILITY])
 258            AS_IF([test -n "$CFLAG_VISIBILITY"],[CPPFLAGS="$CPPFLAGS $CFLAG_VISIBILITY"])
 259
 260            AC_REQUIRE([_HARDEN_LINKER_FLAGS])
 261            AC_REQUIRE([_HARDEN_CC_COMPILER_FLAGS])
 262            AC_REQUIRE([_HARDEN_CXX_COMPILER_FLAGS])
 263            ])