Use a common build script for both CURL and LibCURL (#4472)

* Use a common build script for both CURL and LibCURL

Co-authored-by: Eric Hanson <5846501+ericphanson@users.noreply.github.com>

Co-authored-by: Mosè Giordano <giordano@users.noreply.github.com>

* Install only curl in CURL_jll, and remove curl from LibCURL_jll

* Delete build_tarballs.jl

Co-authored-by: Mosè Giordano <giordano@users.noreply.github.com>

L/LibCURL/CURL/build_tarballs.jl

@@ -0,0 +1,3 @@
+include("../common.jl")
+
+build_libcurl(ARGS, "CURL")

L/LibCURL/common.jl

@@ -0,0 +1,111 @@
+# Note that this script can accept some limited command-line arguments, run
+# `julia build_tarballs.jl --help` to see a usage message.
+using BinaryBuilder, Pkg
+
+function build_libcurl(ARGS, name::String)
+    version = v"7.81.0"
+    hash = "ac8e1087711084548d788ef18b9b732c8de887457b81f616fc681d1044b32f98"
+
+    if name == "CURL"
+        this_is_curl_jll = true
+    elseif name == "LibCURL"
+        this_is_curl_jll = false
+    else
+        msg = "Not a valid name: $(name). Valid names are: LibCURL, CURL"
+        throw(ArgumentError(msg))
+    end
+
+    # Collection of sources required to build LibCURL
+    sources = [
+        ArchiveSource("https://curl.se/download/curl-$(version).tar.gz", hash),
+    ]
+
+    # Bash recipe for building across all platforms
+    script = "THIS_IS_CURL=$(this_is_curl_jll)\n" * raw"""
+    cd $WORKSPACE/srcdir/curl-*
+
+    # Holy crow we really configure the bitlets out of this thing
+    FLAGS=(
+        # Disable....almost everything
+        --without-ssl --without-gnutls --without-gssapi
+        --without-libidn --without-libidn2 --without-librtmp
+        --without-nss --without-polarssl
+        --without-spnego --without-libpsl --disable-ares --disable-manual
+        --disable-ldap --disable-ldaps --without-zsh-functions-dir
+        --disable-static --without-libgsasl
+
+        # A few things we actually enable
+        --with-libssh2=${prefix} --with-zlib=${prefix} --with-nghttp2=${prefix}
+        --enable-versioned-symbols
+    )
+
+
+    if [[ ${target} == *mingw* ]]; then
+        # We need to tell it where to find libssh2 on windows
+        FLAGS+=(LDFLAGS="${LDFLAGS} -L${prefix}/bin")
+
+        # We also need to tell it to link against schannel (native TLS library)
+        FLAGS+=(--with-schannel)
+    elif [[ ${target} == *darwin* ]]; then
+        # On Darwin, we need to use SecureTransport (native TLS library)
+        FLAGS+=(--with-secure-transport)
+
+        # We need to explicitly request a higher `-mmacosx-version-min` here, so that it doesn't
+        # complain about: `Symbol not found: ___isOSVersionAtLeast`
+        if [[ "${target}" == *x86_64* ]]; then
+            export CFLAGS=-mmacosx-version-min=10.11
+        fi
+    else
+        # On all other systems, we use MbedTLS
+        FLAGS+=(--with-mbedtls=${prefix})
+    fi
+
+    ./configure --prefix=$prefix --host=$target --build=${MACHTYPE} "${FLAGS[@]}"
+    make -j${nproc}
+    if [[ "${THIS_IS_CURL}" == true ]]; then
+        # Manually install only `curl`
+        install -Dm 755 "src/.libs/curl${exeext}" "${bindir}/curl${exeext}"
+    else
+        # Install everything...
+        make install
+        # ...but remove `curl`
+        rm "${bindir}/curl${exeext}"
+    fi
+    install_license COPYING
+    """
+
+    # These are the platforms we will build for by default, unless further
+    # platforms are passed in on the command line
+    platforms = supported_platforms()
+
+    # The products that we will ensure are always built
+    if this_is_curl_jll
+        # CURL_jll only provides the executable
+        products = [
+            ExecutableProduct("curl", :curl),
+        ]
+    else
+        # LibCURL only provides the library
+        products = [
+            LibraryProduct("libcurl", :libcurl),
+        ]
+    end
+
+    # Dependencies that must be installed before this package can be built
+    dependencies = [
+        Dependency("LibSSH2_jll"),
+        Dependency("Zlib_jll"),
+        Dependency("nghttp2_jll"),
+        # Note that while we unconditionally list MbedTLS as a dependency,
+        # we default to schannel/SecureTransport on Windows/MacOS.
+        Dependency("MbedTLS_jll"; compat="~2.28.0", platforms=filter(p->Sys.islinux(p) || Sys.isfreebsd(p), platforms)),
+    ]
+
+    if this_is_curl_jll
+        # Curl_jll depends on LibCURL_jll
+        push!(dependencies, Dependency("LibCURL_jll"; compat="$(version)"))
+    end
+
+    # Build the tarballs, and possibly a `build.jl` as well.
+    build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; julia_compat="1.8")
+end