config/always-compiler-options.m4

   1 dnl #
   2 dnl # Enabled -fsanitize=address if supported by gcc.
   3 dnl #
   4 dnl # LDFLAGS needs -fsanitize=address at all times so libraries compiled with
   5 dnl # it will be linked successfully. CFLAGS will vary by binary being built.
   6 dnl #
   7 dnl # The ASAN_OPTIONS environment variable can be used to further control
   8 dnl # the behavior of binaries and libraries build with -fsanitize=address.
   9 dnl #
  10 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_ASAN], [
  11         AC_MSG_CHECKING([whether to build with -fsanitize=address support])
  12         AC_ARG_ENABLE([asan],
  13                 [AS_HELP_STRING([--enable-asan],
  14                 [Enable -fsanitize=address support  @<:@default=no@:>@])],
  15                 [],
  16                 [enable_asan=no])
  17
  18         AM_CONDITIONAL([ASAN_ENABLED], [test x$enable_asan = xyes])
  19         AC_SUBST([ASAN_ENABLED], [$enable_asan])
  20         AC_MSG_RESULT($enable_asan)
  21
  22         AS_IF([ test "$enable_asan" = "yes" ], [
  23                 AC_MSG_CHECKING([whether $CC supports -fsanitize=address])
  24                 saved_cflags="$CFLAGS"
  25                 CFLAGS="$CFLAGS -Werror -fsanitize=address"
  26                 AC_LINK_IFELSE([
  27                         AC_LANG_SOURCE([[ int main() { return 0; } ]])
  28                 ], [
  29                         ASAN_CFLAGS="-fsanitize=address"
  30                         ASAN_LDFLAGS="-fsanitize=address"
  31                         ASAN_ZFS="_with_asan"
  32                         AC_MSG_RESULT([yes])
  33                 ], [
  34                         AC_MSG_ERROR([$CC does not support -fsanitize=address])
  35                 ])
  36                 CFLAGS="$saved_cflags"
  37         ], [
  38                 ASAN_CFLAGS=""
  39                 ASAN_LDFLAGS=""
  40                 ASAN_ZFS="_without_asan"
  41         ])
  42
  43         AC_SUBST([ASAN_CFLAGS])
  44         AC_SUBST([ASAN_LDFLAGS])
  45         AC_SUBST([ASAN_ZFS])
  46 ])
  47
  48 dnl #
  49 dnl # Check if gcc supports -Wframe-larger-than=<size> option.
  50 dnl #
  51 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_FRAME_LARGER_THAN], [
  52         AC_MSG_CHECKING([whether $CC supports -Wframe-larger-than=<size>])
  53
  54         saved_flags="$CFLAGS"
  55         CFLAGS="$CFLAGS -Werror -Wframe-larger-than=4096"
  56
  57         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
  58                 FRAME_LARGER_THAN="-Wframe-larger-than=4096"
  59                 AC_MSG_RESULT([yes])
  60         ], [
  61                 FRAME_LARGER_THAN=""
  62                 AC_MSG_RESULT([no])
  63         ])
  64
  65         CFLAGS="$saved_flags"
  66         AC_SUBST([FRAME_LARGER_THAN])
  67 ])
  68
  69 dnl #
  70 dnl # Check if gcc supports -Wno-format-truncation option.
  71 dnl #
  72 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_TRUNCATION], [
  73         AC_MSG_CHECKING([whether $CC supports -Wno-format-truncation])
  74
  75         saved_flags="$CFLAGS"
  76         CFLAGS="$CFLAGS -Werror -Wno-format-truncation"
  77
  78         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
  79                 NO_FORMAT_TRUNCATION=-Wno-format-truncation
  80                 AC_MSG_RESULT([yes])
  81         ], [
  82                 NO_FORMAT_TRUNCATION=
  83                 AC_MSG_RESULT([no])
  84         ])
  85
  86         CFLAGS="$saved_flags"
  87         AC_SUBST([NO_FORMAT_TRUNCATION])
  88 ])
  89
  90 dnl #
  91 dnl # Check if gcc supports -Wno-format-truncation option.
  92 dnl #
  93 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_ZERO_LENGTH], [
  94         AC_MSG_CHECKING([whether $CC supports -Wno-format-zero-length])
  95
  96         saved_flags="$CFLAGS"
  97         CFLAGS="$CFLAGS -Werror -Wno-format-zero-length"
  98
  99         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 100                 NO_FORMAT_ZERO_LENGTH=-Wno-format-zero-length
 101                 AC_MSG_RESULT([yes])
 102         ], [
 103                 NO_FORMAT_ZERO_LENGTH=
 104                 AC_MSG_RESULT([no])
 105         ])
 106
 107         CFLAGS="$saved_flags"
 108         AC_SUBST([NO_FORMAT_ZERO_LENGTH])
 109 ])
 110
 111
 112 dnl #
 113 dnl # Check if gcc supports -Wno-bool-compare option.
 114 dnl #
 115 dnl # We actually invoke gcc with the -Wbool-compare option
 116 dnl # and infer the 'no-' version does or doesn't exist based upon
 117 dnl # the results.  This is required because when checking any of
 118 dnl # no- prefixed options gcc always returns success.
 119 dnl #
 120 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_BOOL_COMPARE], [
 121         AC_MSG_CHECKING([whether $CC supports -Wno-bool-compare])
 122
 123         saved_flags="$CFLAGS"
 124         CFLAGS="$CFLAGS -Werror -Wbool-compare"
 125
 126         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 127                 NO_BOOL_COMPARE=-Wno-bool-compare
 128                 AC_MSG_RESULT([yes])
 129         ], [
 130                 NO_BOOL_COMPARE=
 131                 AC_MSG_RESULT([no])
 132         ])
 133
 134         CFLAGS="$saved_flags"
 135         AC_SUBST([NO_BOOL_COMPARE])
 136 ])
 137
 138 dnl #
 139 dnl # Check if gcc supports -Wno-unused-but-set-variable option.
 140 dnl #
 141 dnl # We actually invoke gcc with the -Wunused-but-set-variable option
 142 dnl # and infer the 'no-' version does or doesn't exist based upon
 143 dnl # the results.  This is required because when checking any of
 144 dnl # no- prefixed options gcc always returns success.
 145 dnl #
 146 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_UNUSED_BUT_SET_VARIABLE], [
 147         AC_MSG_CHECKING([whether $CC supports -Wno-unused-but-set-variable])
 148
 149         saved_flags="$CFLAGS"
 150         CFLAGS="$CFLAGS -Werror -Wunused-but-set-variable"
 151
 152         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 153                 NO_UNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
 154                 AC_MSG_RESULT([yes])
 155         ], [
 156                 NO_UNUSED_BUT_SET_VARIABLE=
 157                 AC_MSG_RESULT([no])
 158         ])
 159
 160         CFLAGS="$saved_flags"
 161         AC_SUBST([NO_UNUSED_BUT_SET_VARIABLE])
 162 ])
 163
 164 dnl #
 165 dnl # Check if gcc supports -fno-omit-frame-pointer option.
 166 dnl #
 167 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_OMIT_FRAME_POINTER], [
 168         AC_MSG_CHECKING([whether $CC supports -fno-omit-frame-pointer])
 169
 170         saved_flags="$CFLAGS"
 171         CFLAGS="$CFLAGS -Werror -fno-omit-frame-pointer"
 172
 173         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 174                 NO_OMIT_FRAME_POINTER=-fno-omit-frame-pointer
 175                 AC_MSG_RESULT([yes])
 176         ], [
 177                 NO_OMIT_FRAME_POINTER=
 178                 AC_MSG_RESULT([no])
 179         ])
 180
 181         CFLAGS="$saved_flags"
 182         AC_SUBST([NO_OMIT_FRAME_POINTER])
 183 ])
 184
 185 dnl #
 186 dnl # Check if cc supports -fno-ipa-sra option.
 187 dnl #
 188 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_IPA_SRA], [
 189         AC_MSG_CHECKING([whether $CC supports -fno-ipa-sra])
 190
 191         saved_flags="$CFLAGS"
 192         CFLAGS="$CFLAGS -Werror -fno-ipa-sra"
 193
 194         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
 195                 NO_IPA_SRA=-fno-ipa-sra
 196                 AC_MSG_RESULT([yes])
 197         ], [
 198                 NO_IPA_SRA=
 199                 AC_MSG_RESULT([no])
 200         ])
 201
 202         CFLAGS="$saved_flags"
 203         AC_SUBST([NO_IPA_SRA])
 204 ])