Workaround the -Werror,-Wmissing-braces errors in prism on system clang on macOS Mojave

Author: eregon

mx.truffleruby/suite.py

@@ -224,6 +224,11 @@
             "dir": "src/main/c/yarp",
             # "makeTarget": "all-no-debug", # Can use this to build without asserts
             "results": ["build/librubyparser.a"],
+            "buildEnv": {
+                # system clang on macOS Mojave warns+errors for `mystruct s = { 0 };` when there are struct fields.
+                # newer compiler do not warn for this.
+                "EXTRA_CFLAGS": "-Wno-missing-braces",
+            },
             "description": "YARP used as a static library"
         },
 

src/main/c/yarp/Makefile

@@ -11,7 +11,7 @@ FUZZ_OUTPUT_DIR = $(shell pwd)/fuzz/output
 SOEXT := $(shell ruby -e 'puts RbConfig::CONFIG["SOEXT"]')
 
 CPPFLAGS := -Iinclude
-CFLAGS := -g -O2 -std=c99 -Wall -Werror -Wextra -Wpedantic -Wundef -Wconversion -fPIC -fvisibility=hidden
+CFLAGS := -g -O2 -std=c99 -Wall -Werror -Wextra -Wpedantic -Wundef -Wconversion -fPIC -fvisibility=hidden $(EXTRA_CFLAGS)
 CC := cc
 WASI_SDK_PATH := /opt/wasi-sdk