Fatal error: exception End_of_file when using -o file.cmo #5611
Comments
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Comment author: @damiendoligez This works too: ocamlc -o x.cmo t.mlMy guess: when you say "ocamlc -o t.cmo t.ml", the compiler first compiles t.ml to t.cmo, then tries to link the t.cmo object file to produce an executable named t.cmo. At some point, it opens t.cmo for writing (thus erasing it), then tries to copy data from t.cmo to t.cmo, which fails. I think we need a better error message. In the meantime, the workaround is obvious: don't do that. Also, I have no idea how it could work in 3.12.1... |
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Comment author: meyer Improved error message to avoid clashes: r12901 |
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Comment author: @damiendoligez r 12901 (in trunk) fixes this. |
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Original bug ID: 5611
Reporter: @zoggy
Assigned to: meyer
Status: closed (set by @xavierleroy on 2015-12-11T18:08:06Z)
Resolution: fixed
Priority: normal
Severity: minor
Version: 4.00.0+dev
Target version: 4.01.0+dev
Fixed in version: 4.01.0+dev
Category: ~DO NOT USE (was: OCaml general)
Bug description
Giving a .cmo file to -o option of ocamlc without -c ends with a fatal error.
Steps to reproduce
ocamlc -v
The OCaml compiler, version 4.00.0+dev17_2012-05-02
Standard library directory: /opt/ocaml-4/lib/ocaml
cat > t.ml
let x = 1;;
ocamlc -o t.cmo t.ml
Fatal error: exception End_of_file
But the following works:
ocamlc -c -o t.cmo t.ml
ocamlc -o t.x t.ml
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