1 //===--- Warnings.cpp - C-Language Front-end ------------------------------===//
8 //===----------------------------------------------------------------------===//
12 //===----------------------------------------------------------------------===//
15 // a number of -Wfoo options and their variants, which are driven by TableGen-
16 // generated data, and the special cases -pedantic, -pedantic-errors, -w,
17 // -Werror and -Wfatal-errors.
19 // Each warning option controls any number of actual warnings.
21 //    -Wfoo, -Wno-foo, -Werror=foo, -Wfatal-errors=foo
33 // EmitUnknownDiagWarning - Emit a warning and typo hint for unknown warning
47   Diags.setSuppressSystemWarnings(true);  // Default to -Wno-system-headers  in ProcessWarningOptions()
55   // Handle -ferror-limit  in ProcessWarningOptions()
63   // If -pedantic or -pedantic-errors was specified, then we want to map all  in ProcessWarningOptions()
77   // while the second pass reports warnings/errors.  This has the effect that  in ProcessWarningOptions()
88     for (unsigned i = 0, e = Opts.Warnings.size(); i != e; ++i) {  in ProcessWarningOptions()
90       StringRef Opt = Opts.Warnings[i];  in ProcessWarningOptions()
91       StringRef OrigOpt = Opts.Warnings[i];  in ProcessWarningOptions()
93       // Treat -Wformat=0 as an alias for -Wno-format.  in ProcessWarningOptions()
95         Opt = "no-format";  in ProcessWarningOptions()
97       // Check to see if this warning starts with "no-", if so, this is a  in ProcessWarningOptions()
100       if (Opt.startswith("no-")) {  in ProcessWarningOptions()
105       // Figure out how this option affects the warning.  If -Wfoo, map the  in ProcessWarningOptions()
106       // diagnostic to a warning, if -Wno-foo, map it to ignore.  in ProcessWarningOptions()
110       // -Wsystem-headers is a special case, not driven by the option table.  It  in ProcessWarningOptions()
111       // cannot be controlled with -Werror.  in ProcessWarningOptions()
112       if (Opt == "system-headers") {  in ProcessWarningOptions()
118       // -Weverything is a special case as well.  It implicitly enables all  in ProcessWarningOptions()
119       // warnings, including ones not explicitly in a warning group.  in ProcessWarningOptions()
132       // -Werror/-Wno-error is a special case, not controlled by the option   in ProcessWarningOptions()
133       // table. It also has the "specifier" form of -Werror=foo and -Werror-foo.  in ProcessWarningOptions()
137           if ((Opt[5] != '=' && Opt[5] != '-') || Opt.size() == 6) {  in ProcessWarningOptions()
140                 << "-Werror" << ("-W" + OrigOpt.str());  in ProcessWarningOptions()
155         } else if (DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)) {  in ProcessWarningOptions()
156           EmitUnknownDiagWarning(Diags, Flavor, "-Werror=", Specifier);  in ProcessWarningOptions()
161       // -Wfatal-errors is yet another special case.  in ProcessWarningOptions()
162       if (Opt.startswith("fatal-errors")) {  in ProcessWarningOptions()
165           if ((Opt[12] != '=' && Opt[12] != '-') || Opt.size() == 13) {  in ProcessWarningOptions()
168                 << "-Wfatal-errors" << ("-W" + OrigOpt.str());  in ProcessWarningOptions()
181           // Set the error as fatal flag for this specifier.  in ProcessWarningOptions()
183         } else if (DiagIDs->getDiagnosticsInGroup(Flavor, Specifier, _Diags)) {  in ProcessWarningOptions()
184           EmitUnknownDiagWarning(Diags, Flavor, "-Wfatal-errors=", Specifier);  in ProcessWarningOptions()
190         if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags))  in ProcessWarningOptions()
191           EmitUnknownDiagWarning(Diags, Flavor, isPositive ? "-W" : "-Wno-",  in ProcessWarningOptions()
202       // Check to see if this warning starts with "no-", if so, this is a  in ProcessWarningOptions()
204       bool IsPositive = !Opt.startswith("no-");  in ProcessWarningOptions()
210       // -Reverything sets the state of all remarks. Note that all remarks are  in ProcessWarningOptions()
220         if (DiagIDs->getDiagnosticsInGroup(Flavor, Opt, _Diags))  in ProcessWarningOptions()
221           EmitUnknownDiagWarning(Diags, Flavor, IsPositive ? "-R" : "-Rno-",  in ProcessWarningOptions()