Xcode 10.1: Spurious warning "Missing submodule" when including bsm/audit_kevents.h

Number:rdar://46873878 Date Originated:2018-12-20
Status:Open Resolved:
Product:Xcode Product Version:10.1 (10B61)
Classification:UI/Usability Reproducible:Always
When compiling an Objective-C file that includes or imports the system header file <bsm/audit_kevents.h>, the compiler generates a warning message "Missing submodule 'Darwin.bsm.audit_kevents'" on the line that includes or imports the header. In projects that use the "-Werror" flag, this will prevent the compilation from succeeding, even though the header is included correctly.

Example source file:
#import <Foundation/Foundation.h>

#include <bsm/libbsm.h>
#import <bsm/audit_kevents.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        printf("AUE_FORK = %d\n", AUE_FORK);
    return 0;

This file causes the warning "Missing submodule 'Darwin.bsm.audit_kevents'" for the line "#import <bsm/audit_kevents.h>".


Workaround: Use "-Wno-incomplete-umbrella"

Of course, it is possible to work around the issue by adding the flag "-Wno-incomplete-umbrella" to the "Other C flags" setting (OTHER_CFLAGS) for the file or project in question.

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