c: Use internal linkage when running tests.

This matches what we do for compiler-rt.

1 files changed, 10 insertions, 8 deletions

diff --git a/lib/c.zig b/lib/c.zig
index 927d71d82f..31a7d3d6ff 100644
--- a/lib/c.zig
+++ b/lib/c.zig
@@ -11,6 +11,8 @@ const native_os = builtin.os.tag;
 const native_arch = builtin.cpu.arch;
 const native_abi = builtin.abi;
 
+const linkage: std.builtin.GlobalLinkage = if (builtin.is_test) .internal else .strong;
+
 const is_wasm = switch (native_arch) {
     .wasm32, .wasm64 => true,
     else => false,
@@ -30,14 +32,14 @@ comptime {
     }
 
     if (builtin.link_libc) {
-        @export(&strcmp, .{ .name = "strcmp", .linkage = .strong });
-        @export(&strncmp, .{ .name = "strncmp", .linkage = .strong });
-        @export(&strerror, .{ .name = "strerror", .linkage = .strong });
-        @export(&strlen, .{ .name = "strlen", .linkage = .strong });
-        @export(&strcpy, .{ .name = "strcpy", .linkage = .strong });
-        @export(&strncpy, .{ .name = "strncpy", .linkage = .strong });
-        @export(&strcat, .{ .name = "strcat", .linkage = .strong });
-        @export(&strncat, .{ .name = "strncat", .linkage = .strong });
+        @export(&strcmp, .{ .name = "strcmp", .linkage = linkage });
+        @export(&strncmp, .{ .name = "strncmp", .linkage = linkage });
+        @export(&strerror, .{ .name = "strerror", .linkage = linkage });
+        @export(&strlen, .{ .name = "strlen", .linkage = linkage });
+        @export(&strcpy, .{ .name = "strcpy", .linkage = linkage });
+        @export(&strncpy, .{ .name = "strncpy", .linkage = linkage });
+        @export(&strcat, .{ .name = "strcat", .linkage = linkage });
+        @export(&strncat, .{ .name = "strncat", .linkage = linkage });
     }
 }