fix: strip .sframe from glibc crt objects to unblock Zig linker on GCC 15+ (#143)

GCC 15+ compiles glibc crt startup objects (crt1.o, Scrt1.o, rcrt1.o)
with .sframe sections that use R_X86_64_PC64 relocations. Zig's
self-hosted linker doesn't support this relocation type, causing
build-time helpers such as ghostty-build-data to fail with:

  error: fatal linker error: unhandled relocation type R_X86_64_PC64
      note: in /usr/lib/crt1.o:.sframe

After pacman installs packages in setup-env.sh, use objcopy to strip
.sframe and .rela.sframe from the affected objects. This is
version-agnostic and requires no changes to the Zig invocation.

Also remove URUNTIME_PRELOAD from bundle-appimage.sh — the aarch64
dwarfs-lite uruntime variant does not support the URUNTIME_MOUNT marker
patching it requires, causing AppImage packaging to fail on aarch64.

Fixes: #138
See: https://ziggit.dev/t/linker-error-when-building-zig-from-source/14394

Co-authored-by: Dino Korah <691011+codemedic@users.noreply.github.com>

Author: codemedic

bin/build-ghostty.sh

@@ -42,10 +42,10 @@ BUILD_ARGS="${BUILD_ARGS} -Dversion-string=${GHOSTTY_VERSION}"
 
 # Configure Zig: https://ziglang.org
 ZIG_VERSION="$(cat "ghostty-${GHOSTTY_VERSION}/build.zig.zon" | grep ".minimum_zig_version" | cut -d'"' -f2)"
+ZIG_PACKAGE_NAME="zig-${ARCH}-linux-${ZIG_VERSION}"
 CURRENT_ZIG_VERSION=$(zig version 2>/dev/null || true)
 if [ "$CURRENT_ZIG_VERSION" != "$ZIG_VERSION" ]; then
 	echo "Installing Zig ${ZIG_VERSION}..."
-	ZIG_PACKAGE_NAME="zig-${ARCH}-linux-${ZIG_VERSION}"
 	ZIG_URL="https://ziglang.org/download/${ZIG_VERSION}/${ZIG_PACKAGE_NAME}.tar.xz"
 	rm -rf /opt/zig*
 	unlink /usr/local/bin/zig || true

bin/bundle-appimage.sh

@@ -6,7 +6,6 @@ ARCH="$(uname -m)"
 GHOSTTY_VERSION="$(cat VERSION)"
 
 export UPINFO="gh-releases-zsync|$(echo "${GITHUB_REPOSITORY}" | tr '/' '|')|latest|Ghostty-*$ARCH.AppImage.zsync"
-export URUNTIME_PRELOAD=1
 export DEPLOY_OPENGL=1
 export EXEC_WRAPPER=1
 export OUTNAME="Ghostty-${GHOSTTY_VERSION}-${ARCH}.AppImage"

bin/setup-env.sh

@@ -14,6 +14,14 @@ ghosttyDeps="gtk4 libadwaita gtk4-layer-shell"
 rm -rf "/usr/share/libalpm/hooks/package-cleanup.hook"
 pacman -Syuq --needed --noconfirm --noprogressbar ${buildDeps} ${ghosttyDeps}
 
+# GCC 15+ compiles glibc crt startup objects with .sframe sections that use R_X86_64_PC64
+# relocations. Zig's self-hosted linker doesn't support this relocation type, causing
+# build-time helpers (e.g. ghostty-build-data) to fail. Strip .sframe and its associated
+# relocation section from the affected objects so the linker never encounters them.
+for _crt in /usr/lib/crt1.o /usr/lib/Scrt1.o /usr/lib/rcrt1.o; do
+	[ -f "$_crt" ] && objcopy --remove-section .sframe --remove-section .rela.sframe "$_crt"
+done
+
 ARCH="$(uname -m)"
 
 MINISIGN_VERSION="$(get_latest_gh_release 'jedisct1/minisign')"