add libimagequant

L/libimagequant/build_tarballs.jl

@@ -0,0 +1,62 @@
+# Note that this script can accept some limited command-line arguments, run
+# `julia build_tarballs.jl --help` to see a usage message.
+using BinaryBuilder, BinaryBuilderBase
+
+name = "libimagequant"
+version = v"4.4.1"
+
+# Collection of sources required to complete build
+sources = [
+    GitSource(
+        "https://github.com/ImageOptim/libimagequant.git",
+        "24e2956a37cd7ad1f4b81c0e20318e3239eb71dc"),
+        DirectorySource("./bundled"),
+]
+
+# following https://github.com/ImageOptim/libimagequant/tree/main/imagequant-sys#building-for-c
+script = raw"""
+cd $WORKSPACE/srcdir/libimagequant/
+
+# patch to create a dynamic library
+atomic_patch -p1 ${WORKSPACE}/srcdir/patches/cdylib.patch
+
+cd $WORKSPACE/srcdir/libimagequant/imagequant-sys
+
+# avoid 'cannot create cdylib' error on musl targets
+# see https://github.com/rust-lang/cargo/issues/8607
+#     https://github.com/rust-lang/rust/issues/59302
+if [[ "${target}" == *-musl* ]]; then
+    export RUSTFLAGS="-C target-feature=-crt-static"
+fi
+
+cargo build --release
+install_license COPYRIGHT
+
+# Install under a consistent name
+install -Dvm 755 ../target/${rust_target}/release/*imagequant_sys.${dlext} "${libdir}/libimagequant.${dlext}"
+
+# Install the C header
+install -Dvm 644 libimagequant.h ${includedir}/libimagequant.h
+"""
+
+# These are the platforms we will build for by default, unless further
+# platforms are passed in on the command line
+platforms = supported_platforms()
+# # Rust toolchain for i686 Windows is unusable
+filter!(p -> !Sys.iswindows(p) || arch(p) != "i686", platforms)
+# # Rust toolchain seems to not be available for RISC-V or FreeBSD/aarch64
+filter!(p -> arch(p) != "riscv64", platforms)
+filter!(p -> os(p) != "freebsd" || arch(p) != "aarch64", platforms)
+
+# The products that we will ensure are always built
+products = [
+    LibraryProduct("libimagequant", :libimagequant),
+]
+
+# Dependencies that must be installed before this package can be built
+dependencies = [
+]
+
+# Build the tarballs, and possibly a `build.jl` as well.
+build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies;
+               julia_compat="1.6", compilers=[:c, :rust], lock_microarchitecture=false)

L/libimagequant/bundled/patches/cdylib.patch

@@ -0,0 +1,13 @@
+diff --git a/imagequant-sys/Cargo.toml b/imagequant-sys/Cargo.toml
+index 50cb6e9..c5d5162 100644
+--- a/imagequant-sys/Cargo.toml
++++ b/imagequant-sys/Cargo.toml
+@@ -17,7 +17,7 @@ build = "build.rs"
+ rust-version = "1.63"
+
+ [lib]
+-crate-type = ["staticlib", "lib"]
++crate-type = ["staticlib", "lib", "cdylib"]
+ doctest = false
+ path = "src/ffi.rs"
+ name = "imagequant_sys"