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[modules] When explicitly importing a module, it's fine for the imported module

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to be newer than we were expecting. That happens if .pcm's get moved between
file systems during a distributed build. (It's still not OK for them to actually
be different, though, so we still check the size and signature matches.)

llvm-svn: 222507
This commit is contained in:
Richard Smith 2014-11-21 05:37:20 +00:00
parent e06124799b
commit 5b39075668
2 changed files with 27 additions and 0 deletions
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7
clang/lib/Serialization/ModuleManager.cpp
View File

@ -67,6 +67,13 @@ ModuleManager::addModule(StringRef FileName, ModuleKind Type,
// Look for the file entry. This only fails if the expected size or
// modification time differ.
const FileEntry *Entry;
if (Type == MK_ExplicitModule) {
// If we're not expecting to pull this file out of the module cache, it
// might have a different mtime due to being moved across filesystems in
// a distributed build. The size must still match, though. (As must the
// contents, but we can't check that.)
ExpectedModTime = 0;
}
if (lookupModuleFile(FileName, ExpectedSize, ExpectedModTime, Entry)) {
ErrorStr = "module file out of date";
return OutOfDate;

20
clang/test/Modules/explicit-build.cpp
View File

@ -153,3 +153,23 @@
// RUN: %s 2>&1 | FileCheck --check-prefix=CHECK-BAD-FILE %s
//
// CHECK-BAD-FILE: fatal error: file '{{.*}}t.pcm' is not a precompiled module file
// -------------------------------
// Check that we don't get upset if B's timestamp is newer than C's.
// RUN: touch %t/b.pcm
//
// RUN: %clang_cc1 -x c++ -std=c++11 -fmodules -fmodules-cache-path=%t -Rmodule-build -fno-modules-error-recovery \
// RUN: -I%S/Inputs/explicit-build \
// RUN: -fmodule-file=%t/c.pcm \
// RUN: -verify %s -DHAVE_A -DHAVE_B -DHAVE_C
//
// ... but that we do get upset if our B is different from the B that C expects.
//
// RUN: cp %t/b-not-a.pcm %t/b.pcm
//
// RUN: not %clang_cc1 -x c++ -std=c++11 -fmodules -fmodules-cache-path=%t -Rmodule-build -fno-modules-error-recovery \
// RUN: -I%S/Inputs/explicit-build \
// RUN: -fmodule-file=%t/c.pcm \
// RUN: %s -DHAVE_A -DHAVE_B -DHAVE_C 2>&1 | FileCheck --check-prefix=CHECK-MISMATCHED-B %s
//
// CHECK-MISMATCHED-B: fatal error: malformed or corrupted AST file: {{.*}}b.pcm": module file out of date