Add .compilation-options file support

src/bpmlib/compilation.go

@@ -23,6 +23,12 @@ func CompileSourcePackage(archiveFilename, outputFilename string, skipChecks boo
 		return errors.New("cannot compile a non-source package")
 	}
 
+	// Read compilation options file in current directory
+	compilationOptions, err := readCompilationOptionsFile()
+	if err != nil {
+		return err
+	}
+
 	// Get HOME directory
 	homeDir, err := os.UserHomeDir()
 	if err != nil {
@@ -81,7 +87,12 @@ func CompileSourcePackage(archiveFilename, outputFilename string, skipChecks boo
 	env = append(env, "BPM_PKG_NAME="+bpmpkg.PkgInfo.Name)
 	env = append(env, "BPM_PKG_VERSION="+bpmpkg.PkgInfo.Version)
 	env = append(env, "BPM_PKG_REVISION="+strconv.Itoa(bpmpkg.PkgInfo.Revision))
-	env = append(env, "BPM_PKG_ARCH="+GetArch())
+	// Check for architecture override in compilation options
+	if val, ok := compilationOptions["ARCH"]; ok {
+		env = append(env, "BPM_PKG_ARCH="+val)
+	} else {
+		env = append(env, "BPM_PKG_ARCH="+GetArch())
+	}
 	env = append(env, BPMConfig.CompilationEnvironment...)
 
 	// Execute prepare and build functions in source.sh script
@@ -200,3 +211,47 @@ func CompileSourcePackage(archiveFilename, outputFilename string, skipChecks boo
 
 	return nil
 }
+
+func readCompilationOptionsFile() (options map[string]string, err error) {
+	// Initialize options map
+	options = make(map[string]string)
+
+	// Check if file compilation options file exists
+	stat, err := os.Stat(".compilation-options")
+	if err != nil {
+		return nil, nil
+	}
+
+	// Ensure it is a regular file
+	if !stat.Mode().IsRegular() {
+		return nil, fmt.Errorf("%s is not a regular file", stat.Name())
+	}
+
+	// Read file data
+	data, err := os.ReadFile(stat.Name())
+	if err != nil {
+		return nil, err
+	}
+
+	for _, line := range strings.Split(string(data), "\n") {
+		// Trim line
+		line = strings.TrimSpace(line)
+
+		// Skip empty lines
+		if line == "" {
+			continue
+		}
+
+		// Split line
+		split := strings.SplitN(line, "=", 2)
+
+		// Throw error if line isn't valid
+		if len(split) < 2 {
+			return nil, fmt.Errorf("invalid line in compilation-options file: '%s'", line)
+		}
+
+		options[split[0]] = split[1]
+	}
+
+	return options, nil
+}