impossible change pdfversion in pdflatex

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impossible change pdfversion in pdflatex #645

Closed AlexandrKozlovskiy closed 5 years ago

AlexandrKozlovskiy commented 5 years ago

When i use:

\ExplSyntaxOn
\pdf_version_gset:n{2.0}
\ExplSyntaxOff

in pdflatex i have pdf 1.0 instead 2.0. In lualatex it's all ok.

josephwright commented 5 years ago

The current release pdfTeX does not support setting PDF major version: the value is hard-coded in the binary as 1. The LaTeX team have submitted a patch to introduce new functionality here, but that will not be released before TeX Live 2020 at the earliest.

blefloch commented 5 years ago

Wouldn't it make sense then to have an error message if a version cannot be set in the engine in use?

u-fischer commented 5 years ago

@blefloch I haven't made up my mind yet, which tests are needed/sensible here. Also with the other engines the support for 2.x is quite new and it could get messy if we try to catch every case (and I'm not even sure if it can be checked safely).

AlexandrKozlovskiy commented 5 years ago

Yes,in my opinion it better throws an error,if it impossible set pdf version. If it will be in pdflatex,this feature,i mean setting major version of pdf will works only in texlive or in miktex to?

u-fischer commented 5 years ago

miktex will certainly get the changes too.