Set CFLAGS before init'ing cc::Build (#966)

Author: justsmth

aws-lc-sys/builder/cc_builder.rs

@@ -345,15 +345,16 @@ impl CcBuilder {
  }
 
  pub fn prepare_builder(&self) -> cc::Build {
+ let cflags = get_crate_cflags();
+ if !cflags.is_empty() {
+ set_env_for_target("CFLAGS", cflags);
+ }
+
  let mut cc_build = self.create_builder();
  let (_, build_options) = self.collect_universal_build_options(&cc_build);
  for option in build_options {
  option.apply_cc(&mut cc_build);
  }
- let cflags = get_crate_cflags();
- if !cflags.is_empty() {
- set_env_for_target("CFLAGS", cflags);
- }
 
  // Add --noexecstack flag for assembly files to prevent executable stacks
  // This matches the behavior of AWS-LC's CMake build which uses -Wa,--noexecstack