v2.26.3: fix SatDump AVX2 crash on older CPUs (#185)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 All notable changes to iNTERCEPT will be documented in this file.
 
+## [2.26.3] - 2026-03-13
+
+### Fixed
+- **SatDump AVX2 crash** — SatDump now compiles with `-march=x86-64` on x86_64 platforms (Docker and `setup.sh`), preventing "Illegal instruction" crashes on CPUs without AVX2. SIMD plugins still use runtime detection for acceleration on capable hardware. (#185)
+
+---
+
 ## [2.26.2] - 2026-03-13
 
 ### Fixed

Dockerfile

@@ -130,7 +130,10 @@ RUN cd /tmp \
     && git clone --depth 1 --branch 1.2.2 https://github.com/SatDump/SatDump.git \
     && cd SatDump \
     && mkdir build && cd build \
-    && cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_GUI=OFF -DCMAKE_INSTALL_LIBDIR=lib .. \
+    && ARCH_FLAGS=""; if [ "$(uname -m)" = "x86_64" ]; then ARCH_FLAGS="-march=x86-64"; fi \
+    && cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_GUI=OFF -DCMAKE_INSTALL_LIBDIR=lib \
+           -DCMAKE_C_FLAGS="$ARCH_FLAGS" \
+           -DCMAKE_CXX_FLAGS="$ARCH_FLAGS" .. \
     && make -j$(nproc) \
     && make install \
     && ldconfig \

config.py

@@ -7,10 +7,17 @@ import os
 import sys
 
 # Application version
-VERSION = "2.26.2"
+VERSION = "2.26.3"
 
 # Changelog - latest release notes (shown on welcome screen)
 CHANGELOG = [
+    {
+        "version": "2.26.3",
+        "date": "March 2026",
+        "highlights": [
+            "Fix SatDump AVX2 crash on older CPUs — build now targets baseline x86-64",
+        ]
+    },
     {
         "version": "2.26.2",
         "date": "March 2026",

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "intercept"
-version = "2.26.2"
+version = "2.26.3"
 description = "Signal Intelligence Platform - Pager/433MHz/ADS-B/Satellite/WiFi/Bluetooth"
 readme = "README.md"
 requires-python = ">=3.9"

setup.sh

@@ -957,8 +957,14 @@ install_satdump_from_source_debian() {
     ) &
     progress_pid=$!
 
+    local arch_flags=""
+    if [[ "$(uname -m)" == "x86_64" ]]; then
+      arch_flags="-march=x86-64"
+    fi
+
     if cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_GUI=OFF -DCMAKE_INSTALL_LIBDIR=lib \
-        -DCMAKE_CXX_FLAGS="-Wno-template-body" .. >"$build_log" 2>&1 \
+        -DCMAKE_C_FLAGS="$arch_flags" \
+        -DCMAKE_CXX_FLAGS="$arch_flags -Wno-template-body" .. >"$build_log" 2>&1 \
         && make -j "$(nproc)" >>"$build_log" 2>&1; then
       kill $progress_pid 2>/dev/null; wait $progress_pid 2>/dev/null
       $SUDO make install >/dev/null 2>&1