[cfe-dev] Add -fno-plt,-fplt to ignored flags

[Jordan Glover via cfe-dev]

In GCC there is a -fno-plt [1] flag not implemented in Clang which results in compilation failure:
clang-4.0: error: unknown argument: '-fno-plt'
I created patch that adds -fno-plt and -fplt to existing ignored flags list making it compatible with gcc for package building. I tested it and it works as expected. I sent this patch already to cfe-commits [2] list as advised [3]. I would be grateful if anyone could review it and merge when it's acceptable.
Thank you for your attention. Jordan Glover
[1] https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gcc/Code-Gen-Options.html#Code-Gen-Options
[2] https://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20170703/197341.html
[3] https://clang.llvm.org/hacking.html
Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td (revision 307280)
+++ include/clang/Driver/Options.td (working copy)
@@ -2497,6 +2497,7 @@
defm non_call_exceptions : BooleanFFlag<"non-call-exceptions">, Group<clang_ignored_f_Group>;
defm peel_loops : BooleanFFlag<"peel-loops">, Group<clang_ignored_gcc_optimization_f_Group>;
defm permissive : BooleanFFlag<"permissive">, Group<clang_ignored_f_Group>;
+defm plt : BooleanFFlag<"plt">, Group<clang_ignored_f_Group>;
defm prefetch_loop_arrays : BooleanFFlag<"prefetch-loop-arrays">, Group<clang_ignored_gcc_optimization_f_Group>;
defm printf : BooleanFFlag<"printf">, Group<clang_ignored_f_Group>;
defm profile : BooleanFFlag<"profile">, Group<clang_ignored_f_Group>;
Index: test/Driver/clang_f_opts.c
===================================================================
--- test/Driver/clang_f_opts.c (revision 307280)
+++ test/Driver/clang_f_opts.c (working copy)
@@ -275,6 +275,7 @@
// RUN: -fno-fat-lto-objects -ffat-lto-objects \
// RUN: -fno-merge-constants -fmerge-constants \
// RUN: -fno-caller-saves -fcaller-saves \
+// RUN: -fno-plt \
// RUN: -fno-reorder-blocks -freorder-blocks \
// RUN: -fno-schedule-insns2 -fschedule-insns2 \
// RUN: -fno-stack-check \
@@ -281,6 +282,7 @@
// RUN: -fno-check-new -fcheck-new \
// RUN: -ffriend-injection \
// RUN: -fno-implement-inlines -fimplement-inlines \
+// RUN: -fplt \
// RUN: -fstack-check \
// RUN: -fforce-addr \
// RUN: -malign-functions=100 \
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