update build flags in core (#776)

Author: leighmcculloch

.github/workflows/build.yml

@@ -68,7 +68,7 @@ env:
   # Cache ID is a value inserted into cache keys. Whenever changing the build
   # in a way that needs to use entirely new fresh builds, increment the number
   # by one so that all the keys become new.
-  CACHE_ID: 4
+  CACHE_ID: 5
   ARTIFACT_RETENTION_DAYS_FOR_IMAGE: 7
   ARTIFACT_RETENTION_DAYS_FOR_LOGS: 60
 

Dockerfile.core

@@ -20,10 +20,12 @@ RUN git submodule foreach --recursive git clean -dXf
 
 ARG CC=clang-12
 ARG CXX=clang++-12
-ARG CFLAGS='-O3 -g1'
-ARG CXXFLAGS='-O3 -g1'
+ARG CFLAGS='-O3 -g1 -fno-omit-frame-pointer'
+ARG CXXFLAGS='-O3 -g1 -fno-omit-frame-pointer -stdlib=libc++'
 ARG CONFIGURE_FLAGS=''
 
+RUN sysctl vm.mmap_rnd_bits=28
+
 RUN ./autogen.sh
 RUN ./install-rust.sh
 ENV PATH "/root/.cargo/bin:$PATH"