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[Driver] A .swift file should be rebuilt if its mtime has changed.

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...not if it's newer than its output .o file. This handles cases where the
object file is generated too quickly (rdar://problem/19404140) or when you
revert to a previous version of the file, mtime intact (rdar://problem/19720146).

There's a lot of test churn here; the only real new test is the backwards
mtime update in one-way.swift.

Swift SVN r29584
This commit is contained in:
Jordan Rose
2015-06-24 00:06:58 +00:00
parent 8e071b1148
commit 2b7b78d162
31 changed files with 531 additions and 404 deletions
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18
include/swift/Driver/Job.h
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@@ -143,8 +143,8 @@ private:
/// which will be the Executable).
llvm::opt::ArgStringList Arguments;
/// An estimate of the latest possible time this job was previously run.
llvm::sys::TimeValue MaxPreviousBuildTime = llvm::sys::TimeValue::MinTime();
/// The modification time of the main input file, if any.
llvm::sys::TimeValue InputModTime = llvm::sys::TimeValue::MaxTime();
public:
Job(const Action &Source, const Tool &Creator,
@@ -170,18 +170,12 @@ public:
CreatorAndCondition.setInt(Cond);
}
/// Updates the estimated timestamp of the previous execution of this job.
///
/// \returns true if the new time value is later than the old time value.
bool updatePreviousBuildTime(llvm::sys::TimeValue NewTime) {
if (MaxPreviousBuildTime >= NewTime)
return false;
MaxPreviousBuildTime = NewTime;
return true;
void setInputModTime(llvm::sys::TimeValue time) {
InputModTime = time;
}
llvm::sys::TimeValue getPreviousBuildTime() const {
return MaxPreviousBuildTime;
llvm::sys::TimeValue getInputModTime() const {
return InputModTime;
}
/// Print the command line for this Job to the given \p stream,