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Add cross-compilation support to Makefile #461

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Add cross-compilation support to Makefile #461

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11 changes: 10 additions & 1 deletion Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,7 @@ ifeq ($(TIMESYNC),1)
endif

OS = $(shell uname -s)
ARCH = $(shell uname -m)
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@nohajc nohajc Nov 11, 2025 •
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This can return arm64 on macOS or aarch64 on Linux but clang seems happy with either in the target triple.


KRUN_BINARY_Linux = libkrun$(VARIANT).so.$(FULL_VERSION)
KRUN_SONAME_Linux = libkrun$(VARIANT).so.$(ABI_VERSION)
Expand Down Expand Up @@ -100,10 +101,18 @@ all: $(LIBRARY_RELEASE_$(OS)) libkrun.pc

debug: $(LIBRARY_DEBUG_$(OS)) libkrun.pc

ifeq ($(SYSROOT_LINUX),)
# Build on Linux host
CC_LINUX=$(CC)
else
# Cross-compile on macOS with the LLVM linker (brew install lld)
CC_LINUX=clang -target $(ARCH)-linux-gnu -fuse-ld=lld -Wl,-strip-debug --sysroot $(SYSROOT_LINUX) -Wno-c23-extensions
endif

ifeq ($(BUILD_INIT),1)
INIT_BINARY = init/init
$(INIT_BINARY): $(INIT_SRC)
$(CC) -O2 -static -Wall $(INIT_DEFS) -o $@ $(INIT_SRC) $(INIT_DEFS)
$(CC_LINUX) -O2 -static -Wall $(INIT_DEFS) -o $@ $(INIT_SRC) $(INIT_DEFS)
endif

$(LIBRARY_RELEASE_$(OS)): $(INIT_BINARY)
Expand Down