Enable LTO

Author: AngelYanev

alpine/Dockerfile

@@ -24,6 +24,8 @@ ARG REDISJSON_VERSION
 ARG REDISBLOOM_VERSION
 ARG REDISTIMESERIES_VERSION
 {% endif -%}
+# 0 = off, 1 = enable link-time optimization for bundled modules (e.g. RediSearch). docker build --build-arg LTO=1
+ARG LTO=0
 
 RUN set -eux; \
 	\
@@ -58,10 +60,12 @@ RUN set -eux; \
 		curl \
 		g++ \
 		git \
+		grep \
 		libffi-dev \
 		libgcc \
 		libtool \
 		llvm21-dev \
+		lld21 \
 		ncurses-dev \
 		openssh \
 		openssl  \
@@ -122,7 +126,18 @@ RUN set -eux; \
 	export RUST_DYN_CRT=1; \
 	export PATH="/usr/lib/llvm21/bin:$PATH"; \
 	export BUILD_TLS=yes; \
+	if [ "$BUILD_WITH_MODULES" = "yes" ] && [ "${LTO}" = "1" ]; then \
+		mkdir -p /usr/local/bin; \
+		ln -sf /usr/lib/llvm21/bin/clang-21 /usr/local/bin/clang-21; \
+		ln -sf /usr/lib/llvm21/bin/clang++-21 /usr/local/bin/clang++-21; \
+		ln -sf /usr/lib/llvm21/bin/lld /usr/local/bin/lld; \
+		[ -x /usr/lib/llvm21/bin/lld-21 ] && ln -sf /usr/lib/llvm21/bin/lld-21 /usr/local/bin/lld-21; \
+	fi; \
 	if [ "$BUILD_WITH_MODULES" = "yes" ]; then \
+		export LTO=${LTO}; \
+		if [ "${LTO}" = "1" ]; then \
+			unset CC CXX LD 2>/dev/null || true; \
+		fi; \
 
 	{%- if custom_build %}
 

alpine/Dockerfile.j2

@@ -24,6 +24,8 @@ ARG REDISJSON_VERSION
 ARG REDISBLOOM_VERSION
 ARG REDISTIMESERIES_VERSION
 {% endif %}
+# 0 = off, 1 = enable link-time optimization for bundled modules (e.g. RediSearch). docker build --build-arg LTO=1
+ARG LTO=0
 
 RUN set -eux; \
 	\
@@ -57,10 +59,19 @@ RUN set -eux; \
 			unzip \
 			rsync \
 			clang \
+			lld \
 			automake \
 			autoconf \
 			libtool \
 			g++; \
+		if [ "${LTO}" = "1" ]; then \
+			apt-get install -y --no-install-recommends wget gnupg lsb-release ca-certificates; \
+			wget -qO /tmp/llvm.sh https://apt.llvm.org/llvm.sh; \
+			chmod +x /tmp/llvm.sh; \
+			DEBIAN_FRONTEND=noninteractive /tmp/llvm.sh 21 all; \
+			rm -f /tmp/llvm.sh; \
+			export PATH="/usr/lib/llvm-21/bin:$PATH"; \
+		fi; \
 	fi; \
 	\
 	rm -rf /var/lib/apt/lists/*; \
@@ -121,6 +132,9 @@ RUN set -eux; \
 	grep -F "cd jemalloc && ./configure $extraJemallocConfigureFlags " /usr/src/redis/deps/Makefile; \
 	\
 	export BUILD_TLS=yes; \
+	if [ "$BUILD_WITH_MODULES" = "yes" ]; then \
+		export LTO=${LTO}; \
+	fi; \
 	make -C /usr/src/redis -j "$(nproc)" all; \
 	make -C /usr/src/redis install; \
 	make -C /usr/src/redis distclean; \