Build of SwiftPM-generated Xcode project fails

[skagedal]

Xcode fails when building a Swift Package Manager-generate project that has SQLite.swift as a dependency.

Steps to reproduce

1. Create a new SwiftPM command-line project.

$ mkdir test-sqlite 
$ cd test-sqlite
$ swift package init --type=executable 

2. Edit the Package.swift to add a SQLite.swift dependency

// swift-tools-version:5.0

import PackageDescription

let package = Package(
    name: "test-sqlite-swift",
    dependencies: [
        .package(url: "https://github.com/stephencelis/SQLite.swift.git", from: "0.12.0")
    ],
    targets: [
        .target(name: "test-sqlite", dependencies: ["SQLite"]),
        .testTarget(name: "test-sqliteTests", dependencies: ["test-sqlite"]),
    ]
)

3. Generate xcode project.

$ swift package generate-xcodeproj

4. Open this project in Xcode and press build. I get a lot of errors of the following type while building the SQLiteObjc target:

error: use of '@import' when modules are disabled

Complete output of xcodebuild:

note: Using new build system
note: Planning build
note: Using build description from disk
CompileC /Users/simon/code/test-sqlite/build/test-sqlite-swift.build/Release/SQLiteObjc.build/Objects-normal/x86_64/SQLite-Bridging.o /Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler (in target: SQLiteObjc)
    cd /Users/simon/code/test-sqlite
    export LANG=en_US.US-ASCII
    /Applications/Xcode-10.2.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x objective-c -arch x86_64 -fmessage-length=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 -fobjc-arc -Wno-trigraphs -fpascal-strings -Os -Wno-missing-field-initializers -Wno-missing-prototypes -Wno-return-type -Wno-implicit-atomic-properties -Wno-objc-interface-ivars -Wno-arc-repeated-use-of-weak -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wno-unused-variable -Wunused-value -Wno-empty-body -Wno-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-bool-conversion -Wno-enum-conversion -Wno-float-conversion -Wno-non-literal-null-conversion -Wno-objc-literal-conversion -Wno-shorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wno-undeclared-selector -Wno-deprecated-implementations -DSWIFT_PACKAGE=1 -DOBJC_OLD_DISPATCH_PROTOTYPES=1 -isysroot /Applications/Xcode-10.2.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -fasm-blocks -fstrict-aliasing -Wprotocol -Wdeprecated-declarations -mmacosx-version-min=10.10 -g -Wno-sign-conversion -Wno-infinite-recursion -Wno-comma -Wno-block-capture-autoreleasing -Wno-strict-prototypes -Wno-semicolon-before-method-body -I/Users/simon/code/test-sqlite/build/Release/include -I/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include -I/Users/simon/code/test-sqlite/build/test-sqlite-swift.build/Release/SQLiteObjc.build/DerivedSources-normal/x86_64 -I/Users/simon/code/test-sqlite/build/test-sqlite-swift.build/Release/SQLiteObjc.build/DerivedSources/x86_64 -I/Users/simon/code/test-sqlite/build/test-sqlite-swift.build/Release/SQLiteObjc.build/DerivedSources -F/Users/simon/code/test-sqlite/build/Release -F/Applications/Xcode-10.2.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -MMD -MT dependencies -MF /Users/simon/code/test-sqlite/build/test-sqlite-swift.build/Release/SQLiteObjc.build/Objects-normal/x86_64/SQLite-Bridging.d --serialize-diagnostics /Users/simon/code/test-sqlite/build/test-sqlite-swift.build/Release/SQLiteObjc.build/Objects-normal/x86_64/SQLite-Bridging.dia -c /Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m -o /Users/simon/code/test-sqlite/build/test-sqlite-swift.build/Release/SQLiteObjc.build/Objects-normal/x86_64/SQLite-Bridging.o
In file included from /Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:25:
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:25:1: error: use of '@import' when modules are disabled
@import Foundation;
^
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:26:1: error: use of '@import' when modules are disabled
@import SQLite3;
^
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:28:1: error: unknown type name 'NS_ASSUME_NONNULL_BEGIN'
NS_ASSUME_NONNULL_BEGIN
^
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:29:1: error: expected identifier or '('
typedef NSString * _Nullable (^_SQLiteTokenizerNextCallback)(const char *input, int *inputOffset, int *inputLength);
^
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:30:30: error: unknown type name 'sqlite3'
int _SQLiteRegisterTokenizer(sqlite3 *db, const char *module, const char *tokenizer, _Nullable _SQLiteTokenizerNextCallback callback);
                             ^
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:30:96: error: unknown type name '_SQLiteTokenizerNextCallback'
int _SQLiteRegisterTokenizer(sqlite3 *db, const char *module, const char *tokenizer, _Nullable _SQLiteTokenizerNextCallback callback);
                                                                                               ^
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:30:38: warning: pointer is missing a nullability type specifier (_Nonnull, _Nullable, or _Null_unspecified) [-Wnullability-completeness]
int _SQLiteRegisterTokenizer(sqlite3 *db, const char *module, const char *tokenizer, _Nullable _SQLiteTokenizerNextCallback callback);
                                     ^
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:30:38: note: insert '_Nullable' if the pointer may be null
int _SQLiteRegisterTokenizer(sqlite3 *db, const char *module, const char *tokenizer, _Nullable _SQLiteTokenizerNextCallback callback);
                                     ^
                                       _Nullable 
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:30:38: note
: insert '_Nonnull' if the pointer should never be null
int _SQLiteRegisterTokenizer(sqlite3 *db, const char *module, const char *tokenizer, _Nullable _SQLiteTokenizerNextCallback callback);
                                     ^
                                       _Nonnull 
/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:30:86:

error: nullability specifier '_Nullable' cannot be applied to non-pointer type 'int'

int _SQLiteRegisterTokenizer(sqlite3 *db, const char *module, const char *tokenizer, _Nullable _SQLiteTokenizerNextCallback callback);

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/include/SQLite-Bridging.h:31:1: error: unknown type name 'NS_ASSUME_NONNULL_END'

NS_ASSUME_NONNULL_END

^

In file included from /Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:26:

In file included from

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/fts3_tokenizer.h:27:

In file included from /Applications/Xcode-10.2.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/sqlite3.h:35:

/Applications/Xcode-10.2.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/10.0.1/include/stdarg.h:30

:1: error

: expected identifier or '('

typedef __builtin_va_list va_list;

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:32:25: error: unknown type name '_SQLiteTokenizerNextCallback'

__unsafe_unretained _SQLiteTokenizerNextCallback callback;

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:32:5: warning:

'objc_ownership' only applies to Objective-C object or block pointer types; type here is 'int' [-Wignored-attributes]

__unsafe_unretained _SQLiteTokenizerNextCallback callback;

^

:334:44: note: expanded from here

#define __unsafe_unretained attribute((objc_ownership(none)))

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:43:8: error: unknown type name 'NSMutableDictionary'

static NSMutableDictionary * __SQLiteTokenizerMap;

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:50:5: warning: implicitly declaring library function 'memset' with type 'void *(void , int, unsigned long)' [-Wimplicit-function-declaration]

memset(tokenizer, 0, sizeof( tokenizer));

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:50:5: note: include the header <string.h> or explicitly provide a declaration for 'memset'

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:52:5: error: use of undeclared identifier 'NSString'

NSString * key = [NSString stringWithUTF8String:argv[0]];

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:52:16: error

: use of undeclared identifier 'key'

NSString * key = [NSString stringWithUTF8String:argv[0]];

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:52:23: error: use of undeclared identifier 'NSString'

NSString * key = [NSString stringWithUTF8String:argv[0]];

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:99:21: warning: implicitly declaring library function 'strlen' with type 'unsigned long (const char *)' [-Wimplicit-function-declaration]

*pnBytes = (int)strlen(token);

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:99:

21: note: include the header <string.h> or explicitly provide a declaration for 'strlen'

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:115:96: error: unknown type name '_SQLiteTokenizerNextCallback'

int _SQLiteRegisterTokenizer(sqlite3 *db, const char * moduleName, const char * submoduleName, _SQLiteTokenizerNextCallback callback) {

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:116:12: error: unknown type name 'dispatch_once_t'

static dispatch_once_t onceToken;

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:117:5: warning: implicit declaration of function 'dispatch_once' is invalid in C99 [-Wimplicit-function-declaration]

dispatch_once(&onceToken, ^{

^

/Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m:118:33: error: use of undeclared identifier 'NSMutableDictionary'

__SQLiteTokenizerMap = [NSMutableDictionary new];

^

5 warnings and 17 errors generated.
** BUILD FAILED **
The following build commands failed:

CompileC /Users/simon/code/test-sqlite/build/test-sqlite-swift.build/Release/SQLiteObjc.build/Objects-normal/x86_64/SQLite-Bridging.o /Users/simon/code/test-sqlite/.build/checkouts/SQLite.swift/Sources/SQLiteObjc/SQLite-Bridging.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler

(1 failure)

Build Information

• Xcode version 10.2.1, Swift 5, macOS 10.14.4

[skagedal]

So the issue here is that SwiftPM does not set CLANG_ENABLE_MODULES, see bug report.

The workaround is to change this setting manually in the generated Xcode project. I propose this info is added to the README under the Swift Package Manager heading.

[danramteke]

Hello @skagedal , yes I have seen this issue as well. Here is the link to the bug report. https://bugs.swift.org/browse/SR-8629 Ankit Aggarwal from Apple says how to fix it in the comments:

You can also see a fix for this on my out-of-date branch: #885