This is the code base for compiling HeidiSQL on Linux and macOS. From v13 onwards, the Windows version will be compiled from here.

Since February 2025 I am migrating the sources from the master branch, using Lazarus and FreePascal. I left away some Windows-only stuff which won't ever work on other platforms, such as some Windows message handlings, and ADO driver usage. Therefore, support for MS SQL is being redeveloped via FreeTDS (formerly ADO), but is not yet fully mature.

Ansgar

Install Lazarus 4.8 and FreePascal. Then load the .lpi file in the root directory in the Lazarus IDE. Alternatively, use /usr/bin/lazbuild heidisql.lpi on the command line.

Local fixes for Lazarus 4.8 live in extra/lazarus-patches/4.8/. The CI applies all of them to the Lazarus installation before building, and local builds should do the same:

for p in extra/lazarus-patches/4.8/*.patch; do
  patch -d /path/to/lazarus -p1 --dry-run < "$p" && patch -d /path/to/lazarus -p1 < "$p"
done

On Windows, use patch --binary -p1 instead: without --binary, GNU patch strips the CRs from the patch and rewrites the entire target file with LF line endings.

Patches are stored with LF line endings in the repository, so they match the LF line endings of the Linux Lazarus installation applied by the CI. With core.autocrlf=true the Windows checkout has CRLF line endings, matching the CRLF Lazarus installation for local application.

Generate new patches as commits in a git baseline of the local Lazarus installation and export them with git diff, then convert to CRLF with unix2dos before applying locally with patch --binary.

The Cocoa patches fix undersized fonts and icons in all VirtualTree controls on retina displays, caused by the blit scaling changes in Lazarus 4.6+ (upstream issues #41313/#41299).

Icons added in January 2019 are copyright by Icons8. Used with a special permission from Icons8 given to Ansgar for this project only. Do not copy them for anything else other than building HeidiSQL.