use platforms for macos fix

Author: noajshu

WORKSPACE

@@ -59,3 +59,9 @@ git_repository(
     remote = "https://github.com/nlohmann/json.git",
     shallow_since = "1701207391 +0100",
 )
+
+http_archive(
+    name = "platforms",
+    urls = ["https://github.com/bazelbuild/platforms/archive/refs/tags/0.0.6.zip"],
+    strip_prefix = "platforms-0.0.6",
+)

src/BUILD

@@ -27,10 +27,12 @@ OPT_COPTS = select({
         "-fno-fast-math",
         "-flto",
         "-march=native",
-        "-mmacosx-version-min=10.15"
     ],
     ":debug": ["-Og"],
-}) + ["-std=c++20"]
+}) + ["-std=c++20"] + select({
+    "@platforms//os:macos": ["-mmacosx-version-min=10.15"],
+    "//conditions:default": [],
+})
 
 OPT_LINKOPTS = select({
     "//conditions:default": [