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[GTK] Prevent loading both GTK3 and GTK4 libraries

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Attempting to do so results in the following fatal error:
  Gtk-ERROR **: 19:44:30.851: GTK 2/3 symbols detected.
  Using GTK 2/3 and GTK 4 in the same process is not supported

This may happen, for example, if a QT theme loads GTK3 because it
derives some colors from GTK.

R=thestig

Change-Id: I0ca62bd6f65a25d208a3ff4dd702b6b3492a0bd2
Fixed: 406228267
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6505767
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1455070}
This commit is contained in:
Tom Anderson
2025-05-02 10:49:43 -07:00
committed by Chromium LUCI CQ
parent 5dc11c6d80
commit c7c02544a3
1 changed files with 10 additions and 0 deletions

10
ui/gtk/gtk_compat.cc

@ -123,6 +123,16 @@ bool LoadGtk4() {
}
bool LoadGtkImpl() {
// If GTK3 or GTK4 is somehow already loaded, then the preloaded library must
// be used, because GTK3 and GTK4 have conflicting symbols and cannot be
// loaded simultaneously.
if (dlopen("libgtk-3.so.0", RTLD_LAZY | RTLD_GLOBAL | RTLD_NOLOAD)) {
return LoadGtk3();
}
if (dlopen("libgtk-4.so.1", RTLD_LAZY | RTLD_GLOBAL | RTLD_NOLOAD)) {
return LoadGtk4();
}
auto* cmd = base::CommandLine::ForCurrentProcess();
unsigned int gtk_version;
if (!base::StringToUint(cmd->GetSwitchValueASCII(kGtkVersionFlag),