https://issues.dlang.org/show_bug.cgi?id=13517
Issue ID: 13517
Summary: Only touch .di generated file if changed
Product: D
Version: D2
Hardware: x86
OS: Mac OS X
Status: NEW
Severity: enhancement
Priority: P1
Component: DMD
Assignee: [email protected]
Reporter: [email protected]
Running dmd -H always generates a fresh .di file, even if an existing .di file
exists and has identical content. This confuses build tools - such as make and
derivatives - that rely on file timestamp to assess what needs to be rebuilt.
The compiler should generate the header in e.g. xyz.di.tmp file. Then, if
xyz.di exists, compare the content of xyz.di with xyz.tmp. If they compare
equal, remove xyz.di.tmp and otherwise rename it to xyz.tmp.
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