Added JCC bugfix flag to clang. (#266)

README.md

@@ -58,11 +58,11 @@ Testing brainfuck implementations using two code samples (bench.b and mandel.b).
 |          Nim Clang |   1.94 ± 00.02 |   2.38 ± 00.06 |     35.54 ± 00.86 |
 |                LDC |   1.94 ± 00.03 |   2.95 ± 00.04 |     35.44 ± 00.41 |
 |             Kotlin |   1.96 ± 00.01 |  40.54 ± 00.32 |     35.65 ± 00.51 |
+|            C Clang |   2.05 ± 00.02 |   0.51 ± 00.03 |     41.16 ± 01.39 |
 |                GDC |   2.07 ± 00.03 |   6.29 ± 00.06 |     37.75 ± 00.69 |
 |         Vala Clang |   2.11 ± 00.19 |   3.59 ± 01.26 |     38.82 ± 03.23 |
 |               Rust |   2.18 ± 00.02 |   1.98 ± 00.09 |     39.89 ± 00.79 |
 |             GCC Go |   2.26 ± 00.05 |  21.95 ± 03.91 |     42.04 ± 00.93 |
-|            C Clang |   2.31 ± 00.02 |   0.52 ± 00.03 |     40.96 ± 00.85 |
 |               Java |   2.43 ± 00.04 |  38.65 ± 00.16 |     44.16 ± 00.91 |
 |       C# .NET Core |   2.49 ± 00.02 |  34.59 ± 00.08 |     45.14 ± 00.96 |
 |                 Go |   2.56 ± 00.01 |   3.05 ± 00.36 |     44.08 ± 01.05 |

common/commands.mk

@@ -1,6 +1,5 @@
 GCC_FLAGS := -O3 -Wall -flto -Wa,-mbranches-within-32B-boundaries
-# Eventually, enable clang optimization: --x86-branches-within-32B-boundaries
-CLANG_FLAGS := -O3
+CLANG_FLAGS := -O3 -mbranches-within-32B-boundaries
 LIBNOTIFY_FLAGS := -I../common/libnotify ../common/libnotify/target/libnotify.a
 NIM_FLAGS := -d:danger --verbosity:0 --opt:speed --hints:off
 VALAC_FLAGS := --disable-assert -X -O3 --pkg gio-2.0 --pkg posix