Replace ArrayList.init/ensureTotalCapacity pairs with initCapacity

Because ArrayList.initCapacity uses 'precise' capacity allocation, this should save memory on average, and definitely will save memory in cases where ArrayList is used where a regular allocated slice could have also be used.

1 files changed, 2 insertions, 4 deletions

diff --git a/src/libcxx.zig b/src/libcxx.zig
index 0fa0a8fc75..952b533418 100644
--- a/src/libcxx.zig
+++ b/src/libcxx.zig
@@ -109,8 +109,7 @@ pub fn buildLibCXX(comp: *Compilation) !void {
 
     const cxxabi_include_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libcxxabi", "include" });
     const cxx_include_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libcxx", "include" });
-    var c_source_files = std.ArrayList(Compilation.CSourceFile).init(arena);
-    try c_source_files.ensureTotalCapacity(libcxx_files.len);
+    var c_source_files = try std.ArrayList(Compilation.CSourceFile).initCapacity(arena, libcxx_files.len);
 
     for (libcxx_files) |cxx_src| {
         var cflags = std.ArrayList([]const u8).init(arena);
@@ -256,8 +255,7 @@ pub fn buildLibCXXABI(comp: *Compilation) !void {
 
     const cxxabi_include_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libcxxabi", "include" });
     const cxx_include_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libcxx", "include" });
-    var c_source_files = std.ArrayList(Compilation.CSourceFile).init(arena);
-    try c_source_files.ensureTotalCapacity(libcxxabi_files.len);
+    var c_source_files = try std.ArrayList(Compilation.CSourceFile).initCapacity(arena, libcxxabi_files.len);
 
     for (libcxxabi_files) |cxxabi_src| {
         var cflags = std.ArrayList([]const u8).init(arena);