[llvm-bugs] [Bug 45800] New: clang -MMD only records last source file's dependencies

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45800

            Bug ID: 45800
           Summary: clang -MMD only records last source file's
                    dependencies
           Product: clang
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kbob at jogger-egg.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Created attachment 23442
  --> https://bugs.llvm.org/attachment.cgi?id=23442&action=edit
sources shown in the description

When compiling two or more source files into an executable (not 'cc -c') and
creating a make dependency file with -MMD, clang only records the last source
file's dependencies.

Transcript, observe that both.d does not mention one.c.

sim$ ls
one.c  two.c
sim$ head *
==> one.c <==
extern void two(void);

int main()
{
    two();
    return 0;
}

==> two.c <==
void two() {}
sim$ clang -MMD one.c two.c -o both
sim$ cat both.d
both: two.c
sim$ clang --version
Apple clang version 11.0.0 (clang-1100.0.33.17)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
sim$

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