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45 changes: 14 additions & 31 deletions ext/prism/extconf.rb
Original file line number Diff line number Diff line change
Expand Up @@ -70,26 +70,6 @@ def make(env, target)
return
end

# We're going to need to run `make` using prism's `Makefile`.
# We want to use the same toolchain (compiler, flags, etc) to compile libprism.a and
# the C extension since they will be linked together.
# The C extension uses RbConfig, which contains values from the toolchain that built the running Ruby.
env = RbConfig::CONFIG.slice("SOEXT", "CPPFLAGS", "CFLAGS", "CC", "AR", "ARFLAGS", "MAKEDIRS", "RMALL")

# It's possible that the Ruby that is being run wasn't actually compiled on this
# machine, in which case parts of RbConfig might be incorrect. In this case
# we'll need to do some additional checks and potentially fall back to defaults.
if env.key?("CC") && !File.exist?(env["CC"])
env.delete("CC")
env.delete("CFLAGS")
env.delete("CPPFLAGS")
end

if env.key?("AR") && !File.exist?(env["AR"])
env.delete("AR")
env.delete("ARFLAGS")
end

require "mkmf"

# First, ensure that we can find the header for the prism library.
Expand Down Expand Up @@ -133,18 +113,21 @@ def make(env, target)
archive_target = "build/libprism.a"
archive_path = File.expand_path("../../#{archive_target}", __dir__)

make(env, archive_target) unless File.exist?(archive_path)
$LOCAL_LIBS << " #{archive_path}"
def src_list(path)
srcdir = path.dup
RbConfig.expand(srcdir) # mutates srcdir :-/
Dir[File.join(srcdir, "*.{#{SRC_EXT.join(%q{,})}}")]
end

def add_libprism_source(path)
$VPATH << path
src_list path
end

$srcs = src_list("$(srcdir)") +
add_libprism_source("$(srcdir)/../../src") +
add_libprism_source("$(srcdir)/../../src/util")

# Finally, we'll create the `Makefile` that is going to be used to configure and
# build the C extension.
create_makefile("prism/prism")

# Now that the `Makefile` for the C extension is built, we'll append on an extra
# rule that dictates that the extension should be rebuilt if the archive is
# updated.
File.open("Makefile", "a") do |mf|
mf.puts
mf.puts("# Automatically rebuild the extension if libprism.a changed")
mf.puts("$(TARGET_SO): $(LOCAL_LIBS)")
end
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