diff options
Diffstat (limited to 'config/always-compiler-options.m4')
| -rw-r--r-- | config/always-compiler-options.m4 | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/config/always-compiler-options.m4 b/config/always-compiler-options.m4 new file mode 100644 index 000000000..fcbbf5e76 --- /dev/null +++ b/config/always-compiler-options.m4 @@ -0,0 +1,141 @@ +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]) +]) |