I have a compilation error when using gcc 7.3.0 under Ubuntu 18.04 x64 on the current HEAD:
jvoisin@grimhilde 12:36 ~/dev/hardened_malloc export CC=gcc
jvoisin@grimhilde 12:36 ~/dev/hardened_malloc make
gcc -std=c11 -O2 -flto -fPIC -fvisibility=hidden -fno-plt -pipe -Wall -Wextra -Wmissing-prototypes -D_GNU_SOURCE -c -o chacha.o chacha.c
gcc -std=c11 -O2 -flto -fPIC -fvisibility=hidden -fno-plt -pipe -Wall -Wextra -Wmissing-prototypes -D_GNU_SOURCE -c -o malloc.o malloc.c
malloc.c:148:46: error: initializer element is not constant
static const size_t real_class_region_size = class_region_size * 2;
^~~~~~~~~~~~~~~~~
malloc.c:149:40: error: initializer element is not constant
static const size_t slab_region_size = real_class_region_size * N_SIZE_CLASSES;
^~~~~~~~~~~~~~~~~~~~~~
malloc.c:523:45: error: initializer element is not constant
static const size_t max_region_table_size = class_region_size / PAGE_SIZE;
^~~~~~~~~~~~~~~~~
malloc.c:527:31: error: initializer element is not constant
static size_t regions_total = initial_region_table_size;
^~~~~~~~~~~~~~~~~~~~~~~~~
malloc.c:528:30: error: initializer element is not constant
static size_t regions_free = initial_region_table_size;
^~~~~~~~~~~~~~~~~~~~~~~~~
<builtin>: recipe for target 'malloc.o' failed
make: *** [malloc.o] Error 1
zsh: exit 2 make
jvoisin@grimhilde 12:36 ~/dev/hardened_malloc gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.3.0-27ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 7.3.0 (Ubuntu 7.3.0-27ubuntu1~18.04)
jvoisin@grimhilde 12:36 ~/dev/hardened_malloc git show | head -n1
commit e47c78352401923504da822fe27a4fc50f86b4ae
jvoisin@grimhilde 12:37 ~/dev/hardened_malloc