From 287363e68b5cd50d54d489d5feb8cfce0563e9ce Mon Sep 17 00:00:00 2001
From: Max <99250518+maxib0n@users.noreply.github.com>
Date: Wed, 8 Jul 2026 02:48:12 +0200
Subject: [PATCH] ghostty: link against system fontconfig to fix crashes

Ghostty statically bundles its own copy of fontconfig, and because the
resulting binary is a PIE executable built without hiding those
symbols, it globally exports ~27 Fc* functions. GTK4/Pango load the
system libfontconfig.so.1 into the same process. Due to ELF symbol
interposition, calls made from inside libfontconfig.so.1 (and other
GTK-side consumers, e.g. glycin's SVG loader per ghostty-org/ghostty
discussion #12555) get redirected to Ghostty's bundled copy instead,
corrupting state shared between the two fontconfig instances.

This causes reproducible SIGSEGV/SIGABRT crashes (double free / invalid
free in FcPatternDestroy, FcFontSetDestroy, or segfaults in
FcFontSort), most easily triggered by moving a Ghostty window between
monitors with different scale factors, which forces a font grid
rebuild through fontconfig.

Passing -fsys=fontconfig makes Ghostty dynamically link the system
fontconfig instead of statically bundling its own, leaving a single
fontconfig instance in the process. Verified locally: the resulting
binary exports zero Fc* symbols (down from 27), lists
libfontconfig.so.1 as a proper NEEDED entry, and no longer crashes
under repeated monitor moves that reliably crashed the unpatched
build.
---
 ghostty/ghostty.spec | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ghostty/ghostty.spec b/ghostty/ghostty.spec
index 5b56405..401af4c 100644
--- a/ghostty/ghostty.spec
+++ b/ghostty/ghostty.spec
@@ -1,6 +1,6 @@
 Name:           ghostty
 Version:        1.3.1
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        Fast, feature-rich, and cross-platform terminal emulator that uses platform-native UI and GPU acceleration
 
 
@@ -67,7 +67,8 @@ DESTDIR=%{buildroot} zig build \
     -Dpie=true \
     -Dstrip=false \
     -Demit-docs \
-    -Demit-themes=true
+    -Demit-themes=true \
+    -fsys=fontconfig
 
 %if 0%{?fedora} >= 42
     rm -f "%{buildroot}%{_prefix}/share/terminfo/g/ghostty"