vsk added inline comments.
================
Comment at: lib/Frontend/CompilerInvocation.cpp:965
+ Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option) ||
+ (DefaultShowOpt && !Args.hasArg(OPT_fno_diagnostics_show_option));
----------------
Does it make sense to use: hasFlag (OptSpecifier Pos, OptSpecifier Neg, bool
Default=DefaultShowOpt) ? This might take care of an edge case where both
show_option and no_show_option are specified -- the last flag passed should win
out.
================
Comment at: test/Driver/show-option-names.c:4
+// RUN: %clang -c -target i386-apple-darwin10 -fno-diagnostics-show-option
-isysroot /FOO %s 2>&1 | FileCheck --check-prefix=CHECK-NO-SHOW-OPTION-NAMES %s
+// CHECK-NO-SHOW-OPTION-NAMES-NOT: warning: no such sysroot directory:
'{{([A-Za-z]:.*)?}}/FOO' [-Wmissing-sysroot]
----------------
Can you split this into two checks? One to check that the warning appear, and
another to check that the option isn't printed.
https://reviews.llvm.org/D24516
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