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Add -f[no-]strict-overflow to the Clang driver. Use it to set the 

default for -fwrapv if that flag isn't specified explicitly. We always
prefer an explict setting of -fwrapv when present. Also adds support for
-fno-wrapv to allow disabling -fwrapv even when -fno-strict-overflow is
passed.

llvm-svn: 128353
This commit is contained in:
Chandler Carruth 2011-03-27 00:04:55 +00:00
parent a172e08824
commit 6e50103acd
2 changed files with 14 additions and 1 deletions
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3
clang/include/clang/Driver/Options.td
View File

@ -355,12 +355,14 @@ def fno_show_source_location : Flag<"-fno-show-source-location">, Group<f_Group>
def fno_spell_checking : Flag<"-fno-spell-checking">, Group<f_Group>;
def fno_stack_protector : Flag<"-fno-stack-protector">, Group<f_Group>;
def fno_strict_aliasing : Flag<"-fno-strict-aliasing">, Group<f_Group>;
def fno_strict_overflow : Flag<"-fno-strict-overflow">, Group<f_Group>;
def fno_threadsafe_statics : Flag<"-fno-threadsafe-statics">, Group<f_Group>;
def fno_use_cxa_atexit : Flag<"-fno-use-cxa-atexit">, Group<f_Group>;
def fno_unit_at_a_time : Flag<"-fno-unit-at-a-time">, Group<f_Group>;
def fno_unwind_tables : Flag<"-fno-unwind-tables">, Group<f_Group>;
def fno_verbose_asm : Flag<"-fno-verbose-asm">, Group<f_Group>;
def fno_working_directory : Flag<"-fno-working-directory">, Group<f_Group>;
def fno_wrapv : Flag<"-fno-wrapv">, Group<f_Group>;
def fno_zero_initialized_in_bss : Flag<"-fno-zero-initialized-in-bss">, Group<f_Group>;
def fobjc_atdefs : Flag<"-fobjc-atdefs">, Group<clang_ignored_f_Group>;
def fobjc_call_cxx_cdtors : Flag<"-fobjc-call-cxx-cdtors">, Group<clang_ignored_f_Group>;
@ -408,6 +410,7 @@ def fsigned_char : Flag<"-fsigned-char">, Group<f_Group>;
def fstack_protector_all : Flag<"-fstack-protector-all">, Group<f_Group>;
def fstack_protector : Flag<"-fstack-protector">, Group<f_Group>;
def fstrict_aliasing : Flag<"-fstrict-aliasing">, Group<f_Group>;
def fstrict_overflow : Flag<"-fstrict-overflow">, Group<f_Group>;
def fsyntax_only : Flag<"-fsyntax-only">, Flags<[DriverOption]>;
def ftabstop_EQ : Joined<"-ftabstop=">, Group<f_Group>;
def ferror_limit_EQ : Joined<"-ferror-limit=">, Group<f_Group>;

12
clang/lib/Driver/Tools.cpp
View File

@ -1448,7 +1448,17 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back(A->getValue(Args));
}
Args.AddLastArg(CmdArgs, options::OPT_fwrapv);
// -fno-strict-overflow implies -fwrapv if it isn't disabled, but
// -fstrict-overflow won't turn off an explicitly enabled -fwrapv.
if (Arg *A = Args.getLastArg(options::OPT_fwrapv,
options::OPT_fno_wrapv)) {
if (A->getOption().matches(options::OPT_fwrapv))
CmdArgs.push_back("-fwrapv");
} else if (Arg *A = Args.getLastArg(options::OPT_fstrict_overflow,
options::OPT_fno_strict_overflow)) {
if (A->getOption().matches(options::OPT_fno_strict_overflow))
CmdArgs.push_back("-fwrapv");
}
Args.AddLastArg(CmdArgs, options::OPT_fwritable_strings);
Args.AddLastArg(CmdArgs, options::OPT_funroll_loops);