add Darwin build

Author: rbouqueau

README.md

@@ -5,7 +5,7 @@
 ### Build dependencies
 
  - GNU Bash
- - GNU g++ version 9+
+ - GNU g++ version 7+
  - GNU make
 
 ### Code formatter (optional)
@@ -25,10 +25,16 @@ $ sudo make install
 
 ### Native build
 
+Linux, Windows:
 ```
 $ make
 ```
 
+MacOS X and BSD-likes:
+```
+$ CXX=scripts/darwin.sh make
+```
+
 ### Cross-compiling
 
 Simply override CXX to use your target toolchain.

check

@@ -3,8 +3,14 @@ set -euo pipefail
 
 export BIN=${BIN-bin}
 
+if [ $(uname -s) == "Darwin" ]; then
+  CORES=$(sysctl -n hw.logicalcpu)
+else
+  CORES=$(nproc)
+fi
+
 ./scripts/reformat.sh
-make -j`nproc`
+CXX=$CXX make -j$CORES
 ./tests/run $BIN
 
 lines=$(find $BIN -name "*.lines" | xargs cat | awk '{s+=$1} END {printf "%d\n", (s/1000)}')

scripts/darwin.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+set -eu
+
+params=()
+for p in "$@" ; do
+  case $p in
+    -Wl,-gc-sections)
+      ;;
+    *)
+      params+=("$p")
+      ;;
+  esac
+done
+
+"/usr/bin/g++" "${params[@]}"
+