Fix MSVC compiler checks

aws-lc-sys/builder/cc_builder.rs

@@ -253,18 +253,22 @@ impl CcBuilder {
  let mut ret_val = false;
  let output_dir = self.out_dir.join(format!("out-{basename}"));
  let mut cc_build = self.create_builder();
- let result = cc_build
+ cc_build
  .file(
  self.manifest_dir
  .join("aws-lc")
  .join("tests")
  .join("compiler_features_tests")
  .join(format!("{basename}.c")),
  )
- .flag("-Wno-unused-parameter")
  .warnings_into_errors(true)
- .out_dir(&output_dir)
- .try_compile_intermediates();
+ .out_dir(&output_dir);
+
+ let compiler = cc_build.get_compiler();
+ if compiler.is_like_gnu() || compiler.is_like_clang() {
+ cc_build.flag("-Wno-unused-parameter");
+ }
+ let result = cc_build.try_compile_intermediates();
 
  if result.is_ok() {
  if !flag.is_empty() {
@@ -293,6 +297,10 @@ impl CcBuilder {
  let exec_path = out_dir().join(basename);
  let memcmp_build = cc::Build::default();
  let memcmp_compiler = memcmp_build.get_compiler();
+ if !memcmp_compiler.is_like_clang() && !memcmp_compiler.is_like_gnu() {
+ // The logic below assumes a Clang or GCC compiler is in use
+ return;
+ }
  let mut memcmp_compile_args = Vec::from(memcmp_compiler.args());
  memcmp_compile_args.push(
  self.manifest_dir