Merge f2b43f9549 into 87863a834b

lib/std/Build/Step/Compile.zig

@@ -695,6 +695,7 @@ fn runPkgConfig(compile: *Compile, lib_name: []const u8) !PkgConfigResult {
         // -lSDL2 -> pkg-config sdl2
         // -lgdk-3 -> pkg-config gdk-3.0
         // -latk-1.0 -> pkg-config atk
+        // -lpulse -> pkg-config libpulse
         const pkgs = try getPkgConfigList(b);
 
         // Exact match means instant winner.
@@ -711,13 +712,14 @@ fn runPkgConfig(compile: *Compile, lib_name: []const u8) !PkgConfigResult {
             }
         }
 
-        // Now try appending ".0".
+        // Prefixed "lib" or suffixed ".0".
         for (pkgs) |pkg| {
             if (std.ascii.indexOfIgnoreCase(pkg.name, lib_name)) |pos| {
-                if (pos != 0) continue;
-                if (mem.eql(u8, pkg.name[lib_name.len..], ".0")) {
-                    break :match pkg.name;
-                }
+                const prefix = pkg.name[0..pos];
+                const suffix = pkg.name[pos + lib_name.len ..];
+                if (prefix.len > 0 and !mem.eql(u8, prefix, "lib")) continue;
+                if (suffix.len > 0 and !mem.eql(u8, suffix, ".0")) continue;
+                break :match pkg.name;
             }
         }
 

lib/std/math/complex.zig

@@ -115,6 +115,10 @@ pub fn Complex(comptime T: type) type {
         pub fn magnitude(self: Self) T {
             return @sqrt(self.re * self.re + self.im * self.im);
         }
+
+        pub fn squaredMagnitude(self: Self) T {
+            return self.re * self.re + self.im * self.im;
+        }
     };
 }
 
@@ -189,6 +193,13 @@ test "magnitude" {
     try testing.expect(math.approxEqAbs(f32, c, 5.83095, epsilon));
 }
 
+test "squaredMagnitude" {
+    const a = Complex(f32).init(5, 3);
+    const c = a.squaredMagnitude();
+
+    try testing.expect(math.approxEqAbs(f32, c, math.pow(f32, a.magnitude(), 2), epsilon));
+}
+
 test {
     _ = @import("complex/abs.zig");
     _ = @import("complex/acosh.zig");