Initial Galileo receiver and SignalSim integration

tools/build_signalsim.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -lt 1 || $# -gt 2 ]]; then
+    echo "usage: $0 /path/to/SignalSim [build-directory]" >&2
+    exit 2
+fi
+
+signalsim_source=$(realpath "$1")
+project_root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+build_directory=${2:-"${project_root}/build/signalsim"}
+
+if [[ ! -f "${signalsim_source}/IFdataGen/CMakeLists.txt" ]]; then
+    echo "error: ${signalsim_source} is not a SignalSim tree with IFdataGen/CMakeLists.txt" >&2
+    exit 3
+fi
+
+for dependency in cmake c++; do
+    if ! command -v "${dependency}" >/dev/null 2>&1; then
+        echo "error: required build dependency '${dependency}' is missing" >&2
+        exit 4
+    fi
+done
+
+generator=()
+if command -v ninja >/dev/null 2>&1; then
+    generator=(-G Ninja)
+fi
+
+echo "SignalSim source: ${signalsim_source}"
+echo "Build directory: ${build_directory}"
+echo "CMake: $(cmake --version | head -n 1)"
+echo "Compiler: $(c++ --version | head -n 1)"
+if command -v ninja >/dev/null 2>&1; then
+    echo "Ninja: $(ninja --version)"
+else
+    echo "Ninja: unavailable; using CMake default generator"
+fi
+
+cmake -S "${signalsim_source}/IFdataGen" -B "${build_directory}" "${generator[@]}" \
+    -DCMAKE_BUILD_TYPE=Release -DUSE_NATIVE_OPT=OFF
+cmake --build "${build_directory}" --parallel
+
+executable="${build_directory}/IFdataGen"
+if [[ ! -x "${executable}" ]]; then
+    echo "error: build completed without expected executable ${executable}" >&2
+    exit 5
+fi
+
+echo "SIGNALSIM_EXECUTABLE=${executable}"