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6954c22f35
As of the Linux 5.9 kernel a fallthrough macro has been added which should be used to anotate all intentional fallthrough paths. Once all of the kernel code paths have been updated to use fallthrough the -Wimplicit-fallthrough option will because the default. To avoid warnings in the OpenZFS code base when this happens apply the fallthrough macro. Additional reading: https://lwn.net/Articles/794944/ Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #12441
228 lines
5.8 KiB
Plaintext
228 lines
5.8 KiB
Plaintext
dnl #
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dnl # Enabled -fsanitize=address if supported by gcc.
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dnl #
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dnl # LDFLAGS needs -fsanitize=address at all times so libraries compiled with
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dnl # it will be linked successfully. CFLAGS will vary by binary being built.
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dnl #
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dnl # The ASAN_OPTIONS environment variable can be used to further control
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dnl # the behavior of binaries and libraries build with -fsanitize=address.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_ASAN], [
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AC_MSG_CHECKING([whether to build with -fsanitize=address support])
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AC_ARG_ENABLE([asan],
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[AS_HELP_STRING([--enable-asan],
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[Enable -fsanitize=address support @<:@default=no@:>@])],
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[],
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[enable_asan=no])
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AM_CONDITIONAL([ASAN_ENABLED], [test x$enable_asan = xyes])
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AC_SUBST([ASAN_ENABLED], [$enable_asan])
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AC_MSG_RESULT($enable_asan)
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AS_IF([ test "$enable_asan" = "yes" ], [
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AC_MSG_CHECKING([whether $CC supports -fsanitize=address])
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saved_cflags="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -fsanitize=address"
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AC_LINK_IFELSE([
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AC_LANG_SOURCE([[ int main() { return 0; } ]])
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], [
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ASAN_CFLAGS="-fsanitize=address"
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ASAN_LDFLAGS="-fsanitize=address"
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ASAN_ZFS="_with_asan"
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AC_MSG_RESULT([yes])
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], [
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AC_MSG_ERROR([$CC does not support -fsanitize=address])
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])
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CFLAGS="$saved_cflags"
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], [
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ASAN_CFLAGS=""
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ASAN_LDFLAGS=""
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ASAN_ZFS="_without_asan"
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])
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AC_SUBST([ASAN_CFLAGS])
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AC_SUBST([ASAN_LDFLAGS])
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AC_SUBST([ASAN_ZFS])
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])
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dnl #
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dnl # Check if gcc supports -Wframe-larger-than=<size> option.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_FRAME_LARGER_THAN], [
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AC_MSG_CHECKING([whether $CC supports -Wframe-larger-than=<size>])
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saved_flags="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -Wframe-larger-than=4096"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
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FRAME_LARGER_THAN="-Wframe-larger-than=4096"
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AC_MSG_RESULT([yes])
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], [
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FRAME_LARGER_THAN=""
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AC_MSG_RESULT([no])
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])
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CFLAGS="$saved_flags"
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AC_SUBST([FRAME_LARGER_THAN])
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])
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dnl #
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dnl # Check if gcc supports -Wno-format-truncation option.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_TRUNCATION], [
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AC_MSG_CHECKING([whether $CC supports -Wno-format-truncation])
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saved_flags="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -Wno-format-truncation"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
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NO_FORMAT_TRUNCATION=-Wno-format-truncation
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AC_MSG_RESULT([yes])
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], [
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NO_FORMAT_TRUNCATION=
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AC_MSG_RESULT([no])
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])
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CFLAGS="$saved_flags"
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AC_SUBST([NO_FORMAT_TRUNCATION])
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])
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dnl #
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dnl # Check if gcc supports -Wno-format-truncation option.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_ZERO_LENGTH], [
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AC_MSG_CHECKING([whether $CC supports -Wno-format-zero-length])
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saved_flags="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -Wno-format-zero-length"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
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NO_FORMAT_ZERO_LENGTH=-Wno-format-zero-length
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AC_MSG_RESULT([yes])
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], [
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NO_FORMAT_ZERO_LENGTH=
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AC_MSG_RESULT([no])
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])
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CFLAGS="$saved_flags"
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AC_SUBST([NO_FORMAT_ZERO_LENGTH])
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])
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dnl #
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dnl # Check if gcc supports -Wno-bool-compare option.
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dnl #
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dnl # We actually invoke gcc with the -Wbool-compare option
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dnl # and infer the 'no-' version does or doesn't exist based upon
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dnl # the results. This is required because when checking any of
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dnl # no- prefixed options gcc always returns success.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_BOOL_COMPARE], [
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AC_MSG_CHECKING([whether $CC supports -Wno-bool-compare])
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saved_flags="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -Wbool-compare"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
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NO_BOOL_COMPARE=-Wno-bool-compare
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AC_MSG_RESULT([yes])
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], [
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NO_BOOL_COMPARE=
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AC_MSG_RESULT([no])
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])
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CFLAGS="$saved_flags"
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AC_SUBST([NO_BOOL_COMPARE])
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])
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dnl #
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dnl # Check if gcc supports -Wno-unused-but-set-variable option.
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dnl #
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dnl # We actually invoke gcc with the -Wunused-but-set-variable option
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dnl # and infer the 'no-' version does or doesn't exist based upon
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dnl # the results. This is required because when checking any of
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dnl # no- prefixed options gcc always returns success.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_UNUSED_BUT_SET_VARIABLE], [
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AC_MSG_CHECKING([whether $CC supports -Wno-unused-but-set-variable])
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saved_flags="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -Wunused-but-set-variable"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
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NO_UNUSED_BUT_SET_VARIABLE=-Wno-unused-but-set-variable
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AC_MSG_RESULT([yes])
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], [
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NO_UNUSED_BUT_SET_VARIABLE=
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AC_MSG_RESULT([no])
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])
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CFLAGS="$saved_flags"
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AC_SUBST([NO_UNUSED_BUT_SET_VARIABLE])
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])
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dnl #
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dnl # Check if gcc supports -Wimplicit-fallthrough option.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_IMPLICIT_FALLTHROUGH], [
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AC_MSG_CHECKING([whether $CC supports -Wimplicit-fallthrough])
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saved_flags="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -Wimplicit-fallthrough"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
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IMPLICIT_FALLTHROUGH=-Wimplicit-fallthrough
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AC_DEFINE([HAVE_IMPLICIT_FALLTHROUGH], 1,
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[Define if compiler supports -Wimplicit-fallthrough])
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AC_MSG_RESULT([yes])
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], [
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IMPLICIT_FALLTHROUGH=
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AC_MSG_RESULT([no])
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])
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CFLAGS="$saved_flags"
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AC_SUBST([IMPLICIT_FALLTHROUGH])
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])
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dnl #
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dnl # Check if gcc supports -fno-omit-frame-pointer option.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_OMIT_FRAME_POINTER], [
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AC_MSG_CHECKING([whether $CC supports -fno-omit-frame-pointer])
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saved_flags="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -fno-omit-frame-pointer"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
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NO_OMIT_FRAME_POINTER=-fno-omit-frame-pointer
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AC_MSG_RESULT([yes])
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], [
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NO_OMIT_FRAME_POINTER=
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AC_MSG_RESULT([no])
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])
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CFLAGS="$saved_flags"
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AC_SUBST([NO_OMIT_FRAME_POINTER])
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])
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dnl #
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dnl # Check if cc supports -fno-ipa-sra option.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_IPA_SRA], [
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AC_MSG_CHECKING([whether $CC supports -fno-ipa-sra])
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saved_flags="$CFLAGS"
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CFLAGS="$CFLAGS -Werror -fno-ipa-sra"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
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NO_IPA_SRA=-fno-ipa-sra
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AC_MSG_RESULT([yes])
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], [
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NO_IPA_SRA=
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AC_MSG_RESULT([no])
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])
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CFLAGS="$saved_flags"
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AC_SUBST([NO_IPA_SRA])
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])
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