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Issue Description:

swift build (Apple Swift Package Manager - Swift 4.0.0-dev (swiftpm-13502)) fails on macos High Sierra from the command line with the following error:

Compile Swift Module 'EnergyFinanceAnalysis' (1 sources)
Compile Swift Module 'OffshoreWindAnalysis' (2 sources)
/Users/greg/Dropbox/common_files/Programming/Swift/commercial/EnergyAnalysis/OffshoreWindAnalysis/Sources/OffshoreWindAnalysis/OffshoreWindAnalysis.swift:32:25: error: use of undeclared type 'EnergyFinanceAnalysis'
var energyAnalysis: EnergyFinanceAnalysis
^
/Users/greg/Dropbox/common_files/Programming/Swift/commercial/EnergyAnalysis/OffshoreWindAnalysis/Sources/OffshoreWindAnalysis/OffshoreWindAnalysis.swift:32:25: note: cannot use module 'EnergyFinanceAnalysis' as a type
var energyAnalysis: EnergyFinanceAnalysis
^
(with more of a similar nature)

I have a main project OffshoreWindAnalysis which depends on EnergyFinanceAnalysis, a library module. Swift appears to find and compile that module located in a parallel directory, but then swift does not appear to use it.

I have the Package.swift for the main project:

// swift-tools-version:4.0
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
name: "OffshoreWindAnalysis",
products: [
.executable(name: "OffshoreWindAnalysis",
targets: ["OffshoreWindAnalysis"]),
],
dependencies: [
// Dependencies declare other packages that this package depends on.
.package(url: "../EnergyFinanceAnalysis", from: "1.0.0"),
],
targets: [
// Targets are the basic building blocks of a package. A target can define a module or a test suite.
// Targets can depend on other targets in this package, and on products in packages which this package depends on.
.target(
name: "OffshoreWindAnalysis",
dependencies: ["EnergyFinanceAnalysis"]),
.testTarget(
name: "OffshoreWindAnalysisTests",
dependencies: ["OffshoreWindAnalysis"]),
]
)

I have the following Package.swift for the library module:

// swift-tools-version:4.0
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
name: "EnergyFinanceAnalysis",
products: [
// Products define the executables and libraries produced by a package, and make them visible to other packages.
.library(
name: "EnergyFinanceAnalysis",
targets: ["EnergyFinanceAnalysis"]),
],
dependencies: [
// Dependencies declare other packages that this package depends on.
.package(url: "../CIRRCalc", from: "1.0.0"),
],
targets: [
// Targets are the basic building blocks of a package. A target can define a module or a test suite.
// Targets can depend on other targets in this package, and on products in packages which this package depends on.
.target(
name: "EnergyFinanceAnalysis",
dependencies: ["CIRRCalc"]),
.testTarget(
name: "EnergyFinanceAnalysisTests",
dependencies: ["EnergyFinanceAnalysis"]),
]
)

I import EnergyFinanceAnalysis in the appropriate source file for the main project where it is used.

If I do swift package generate-xcodeproj and then try to compile it also fails. In xcode I can remedy it by having the included dependency source file for EnergyFinanceAnalysis added to the target for OffshoreWindAnalysis. But I should be able to do this from the command line completely.