internal/rosa: patch header search paths

This removes the need for reference CFLAGS in the standard toolchain.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/rosa.go

@@ -63,10 +63,6 @@ func triplet() string {
 const (
 	// EnvTriplet holds the return value of triplet.
 	EnvTriplet = "ROSA_TRIPLE"
-	// EnvRefCFLAGS holds toolchain-specific reference CFLAGS.
-	EnvRefCFLAGS = "ROSA_CFLAGS"
-	// EnvRefCXXFLAGS holds toolchain-specific reference CXXFLAGS.
-	EnvRefCXXFLAGS = "ROSA_CXXFLAGS"
 )
 
 // ldflags returns LDFLAGS corresponding to triplet.
@@ -85,13 +81,13 @@ func ldflags(static bool) string {
 	return s
 }
 
-// cflags is reference CFLAGS for the Rosa OS toolchain.
-const cflags = "-Qunused-arguments " +
+// earlyCFLAGS is reference CFLAGS for the stage3 toolchain.
+const earlyCFLAGS = "-Qunused-arguments " +
 	"-isystem/system/include"
 
-// cxxflags returns reference CXXFLAGS for the Rosa OS toolchain corresponding
-// to [runtime.GOARCH].
-func cxxflags() string {
+// earlyCXXFLAGS returns reference CXXFLAGS for the stage3 toolchain
+// corresponding to [runtime.GOARCH].
+func earlyCXXFLAGS() string {
 	return "--start-no-unused-arguments " +
 		"-stdlib=libc++ " +
 		"--end-no-unused-arguments " +
@@ -203,9 +199,6 @@ ln -vs ../usr/bin /work/bin
 		env = fixupEnviron(env, []string{
 			EnvTriplet + "=" + triplet(),
 			lcMessages,
-
-			EnvRefCFLAGS + "=" + cflags,
-			EnvRefCXXFLAGS + "=" + cxxflags(),
 			ldflags(true),
 		}, "/system/bin",
 			"/usr/bin",
@@ -227,11 +220,6 @@ ln -vs ../usr/bin /work/bin
 			EnvTriplet + "=" + triplet(),
 			lcMessages,
 
-			// autotools projects act up with CFLAGS
-			"CC=clang " + cflags,
-			EnvRefCFLAGS + "=" + cflags,
-			"CXX=clang++ " + cxxflags(),
-			EnvRefCXXFLAGS + "=" + cxxflags(),
 			ldflags(false),
 
 			"AR=ar",