QPdfWriter::setDocumentId() is new in Qt 6.8, QTimeZone::UTC in 6.5 and
QHashSeed in 6.2, so the build failed on Qt 6.4 (Ubuntu 24.04). Qt before
6.8 also writes no /ModDate and no XMP metadata, and setDocumentDate()
then gave up and left the time of the export in the file. Those two are
now rewritten when present, and no document id is set where Qt writes
none.
tst_pdfreproducible also checks that the xref table still matches the
file after the dates are rewritten.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PJw3u5AdKQgQVPug8CzuMQ
Two exports of one project differed in the creation and modification
dates (the time of the export, in local time) and in the document id
(random). With SOURCE_DATE_EPOCH set (reproducible-builds.org),
--export-pdf now uses the time it names, in UTC, and a document id
derived from the project: version 5 of the project uuid with the
SHA-256 of the project file, so it is the same for the same file and
changes when the file does. Qt has no setter for the dates, so
PdfLinks::setDocumentDate() rewrites them in the document information
and the XMP metadata after the file is written, fixing the XMP /Length
and shifting the xref table. Without the variable nothing changes.
Only --export-pdf reads it; the print window's PDF export does not, as
a person exporting by hand wants the real date.
qet_export (misc/qet-mcp) gains "reproducible" and "source_date_epoch".
It reports whether the build honoured the variable, since an older one
ignores it.
tst_pdfreproducible exports examples/741.qet four times and requires
identical bytes and the epoch's date; it fails with either this change
or the hash seed fix reverted. Projects with cross-reference links also
need their links in a fixed order, which is a separate fix.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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