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#! /usr/bin/env crystal
#
# This script generates the `lib/llvm_VERSION` file from LLVM-C.dll, needed for
# dynamically linking against LLVM on Windows. This is only needed when using an
# LLVM installation different from the one bundled with Crystal.
require "c/libloaderapi"
# The list of supported targets are hardcoded in:
# https://github.com/llvm/llvm-project/blob/main/llvm/CMakeLists.txt
LLVM_ALL_TARGETS = %w(
AArch64
AMDGPU
ARM
AVR
BPF
Hexagon
Lanai
LoongArch
Mips
MSP430
NVPTX
PowerPC
RISCV
Sparc
SystemZ
VE
WebAssembly
X86
XCore
ARC
CSKY
DirectX
M68k
SPIRV
Xtensa
)
def find_dll_in_env_path
ENV["PATH"]?.try &.split(Process::PATH_DELIMITER, remove_empty: true) do |path|
dll_path = File.join(path, "LLVM-C.dll")
return dll_path if File.exists?(File.join(path, "LLVM-C.dll"))
end
end
unless dll_fname = ARGV.shift? || find_dll_in_env_path
abort "Error: Cannot locate LLVM-C.dll, pass its absolute path as a command-line argument or ensure it is available in the PATH environment variable"
end
unless dll = LibC.LoadLibraryExW(dll_fname.check_no_null_byte.to_utf16, nil, 0)
abort "Error: Failed to load DLL at #{dll_fname}"
end
begin
unless llvm_get_version = LibC.GetProcAddress(dll, "LLVMGetVersion")
abort "Error: Failed to resolve LLVMGetVersion"
end
llvm_get_version = Proc(LibC::UInt*, LibC::UInt*, LibC::UInt*, Nil).new(llvm_get_version, Pointer(Void).null)
major = uninitialized LibC::UInt
minor = uninitialized LibC::UInt
patch = uninitialized LibC::UInt
llvm_get_version.call(pointerof(major), pointerof(minor), pointerof(patch))
targets_built = LLVM_ALL_TARGETS.select do |target|
LibC.GetProcAddress(dll, "LLVMInitialize#{target}Target") && LibC.GetProcAddress(dll, "LLVMInitialize#{target}TargetInfo")
end
# The list of required system libraries are hardcoded in:
# https://github.com/llvm/llvm-project/blob/main/llvm/lib/Support/CMakeLists.txt
# There is no way to infer them from `dumpbin /dependents` alone, because that
# command lists DLLs only, whereas some of these libraries are purely static.
system_libs = %w(psapi shell32 ole32 uuid advapi32)
# https://github.com/llvm/llvm-project/commit/a5ffabce98a4b2e9d69009fa3e60f2b154100860
system_libs << "ws2_32" if {major, minor, patch} >= {18, 0, 0}
puts "#{major}.#{minor}.#{patch}"
puts targets_built.join(' ')
puts system_libs.join(' ', &.+ ".lib")
ensure
LibC.FreeLibrary(dll)
end
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