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dnl #
dnl # Enabled -fsanitize=address if supported by gcc.
dnl #
dnl # LDFLAGS needs -fsanitize=address at all times so libraries compiled with
dnl # it will be linked successfully. CFLAGS will vary by binary being built.
dnl #
dnl # The ASAN_OPTIONS environment variable can be used to further control
dnl # the behavior of binaries and libraries build with -fsanitize=address.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_ASAN], [
AC_MSG_CHECKING([whether to build with -fsanitize=address support])
AC_ARG_ENABLE([asan],
[AS_HELP_STRING([--enable-asan],
[Enable -fsanitize=address support @<:@default=no@:>@])],
[],
[enable_asan=no])
AM_CONDITIONAL([ASAN_ENABLED], [test x$enable_asan = xyes])
AC_SUBST([ASAN_ENABLED], [$enable_asan])
AC_MSG_RESULT($enable_asan)
AS_IF([ test "$enable_asan" = "yes" ], [
AC_MSG_CHECKING([whether $CC supports -fsanitize=address])
saved_cflags="$CFLAGS"
CFLAGS="$CFLAGS -fsanitize=address"
AC_LINK_IFELSE([
AC_LANG_SOURCE([[ int main() { return 0; } ]])
], [
ASAN_CFLAGS="-fsanitize=address"
ASAN_LDFLAGS="-fsanitize=address"
ASAN_ZFS="_with_asan"
AC_MSG_RESULT([yes])
], [
AC_MSG_ERROR([$CC does not support -fsanitize=address])
])
CFLAGS="$saved_cflags"
], [
ASAN_CFLAGS=""
ASAN_LDFLAGS=""
ASAN_ZFS="_without_asan"
])
AC_SUBST([ASAN_CFLAGS])
AC_SUBST([ASAN_LDFLAGS])
AC_SUBST([ASAN_ZFS])
])
dnl #
dnl # Check if gcc supports -Wframe-larger-than=<size> option.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_FRAME_LARGER_THAN], [
AC_MSG_CHECKING([whether $CC supports -Wframe-larger-than=<size>])
saved_flags="$CFLAGS"
CFLAGS="$CFLAGS -Wframe-larger-than=4096"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
FRAME_LARGER_THAN="-Wframe-larger-than=4096"
AC_MSG_RESULT([yes])
], [
FRAME_LARGER_THAN=""
AC_MSG_RESULT([no])
])
CFLAGS="$saved_flags"
AC_SUBST([FRAME_LARGER_THAN])
])
dnl #
dnl # Check if gcc supports -Wno-format-truncation option.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_TRUNCATION], [
AC_MSG_CHECKING([whether $CC supports -Wno-format-truncation])
saved_flags="$CFLAGS"
CFLAGS="$CFLAGS -Wno-format-truncation"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
NO_FORMAT_TRUNCATION=-Wno-format-truncation
AC_MSG_RESULT([yes])
], [
NO_FORMAT_TRUNCATION=
AC_MSG_RESULT([no])
])
CFLAGS="$saved_flags"
AC_SUBST([NO_FORMAT_TRUNCATION])
])
dnl #
dnl # Check if gcc supports -Wno-bool-compare option.
dnl #
dnl # We actually invoke gcc with the -Wbool-compare option
dnl # and infer the 'no-' version does or doesn't exist based upon
dnl # the results. This is required because when checking any of
dnl # no- prefixed options gcc always returns success.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_BOOL_COMPARE], [
AC_MSG_CHECKING([whether $CC supports -Wno-bool-compare])
saved_flags="$CFLAGS"
CFLAGS="$CFLAGS -Wbool-compare"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
NO_BOOL_COMPARE=-Wno-bool-compare
AC_MSG_RESULT([yes])
], [
NO_BOOL_COMPARE=
AC_MSG_RESULT([no])
])
CFLAGS="$saved_flags"
AC_SUBST([NO_BOOL_COMPARE])
])
dnl #
dnl # Check if gcc supports -Wno-unused-but-set-variable option.
dnl #
dnl # We actually invoke gcc with the -Wunused-but-set-variable option
dnl # and infer the 'no-' version does or doesn't exist based upon
dnl # the results. This is required because when checking any of
dnl # no- prefixed options gcc always returns success.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_UNUSED_BUT_SET_VARIABLE], [
AC_MSG_CHECKING([whether $CC supports -Wno-unused-but-set-variable])
saved_flags="$CFLAGS"
CFLAGS="$CFLAGS -Wunused-but-set-variable"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
NO_UNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
AC_MSG_RESULT([yes])
], [
NO_UNUSED_BUT_SET_VARIABLE=
AC_MSG_RESULT([no])
])
CFLAGS="$saved_flags"
AC_SUBST([NO_UNUSED_BUT_SET_VARIABLE])
])
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