Add HelloWorldX builders, test suites for our various compilers

Currently contains:

* C
* C++
* Fortran
* Rust
* Go

The `Rust` test suite is quite restricted in platform, as we have a bit
of breakage there.

H/HelloWorldC/build_tarballs.jl

@@ -0,0 +1,30 @@
+using BinaryBuilder
+
+name = "HelloWorldC"
+version = v"1.0.0"
+
+# No sources, we're just building the testsuite
+sources = [
+]
+
+# Bash recipe for building across all platforms
+script = raw"""
+mkdir -p ${prefix}/bin
+cc -o ${prefix}/bin/hello_world${exeext} -g -O2 /usr/share/testsuite/c/hello_world/hello_world.c
+"""
+
+# 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
+products = [
+    ExecutableProduct("hello_world", :hello_world),
+]
+
+# 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)

H/HelloWorldCxx/build_tarballs.jl

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+using BinaryBuilder
+
+name = "HelloWorldCxx"
+version = v"1.0.0"
+
+# No sources, we're just building the testsuite
+sources = [
+]
+
+# Bash recipe for building across all platforms
+script = raw"""
+mkdir -p ${prefix}/bin
+c++ -o ${prefix}/bin/hello_world${exeext} -g -O2 /usr/share/testsuite/cxx/hello_world/hello_world.cc
+"""
+
+# These are the platforms we will build for by default, unless further
+# platforms are passed in on the command line
+platforms = expand_cxxstring_abis(supported_platforms())
+
+# The products that we will ensure are always built
+products = [
+    ExecutableProduct("hello_world", :hello_world),
+]
+
+# 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)

H/HelloWorldFortran/build_tarballs.jl

@@ -0,0 +1,30 @@
+using BinaryBuilder
+
+name = "HelloWorldFortran"
+version = v"1.0.0"
+
+# No sources, we're just building the testsuite
+sources = [
+]
+
+# Bash recipe for building across all platforms
+script = raw"""
+mkdir -p ${prefix}/bin
+f77 -o ${prefix}/bin/hello_world${exeext} -g -O2 /usr/share/testsuite/fortran/hello_world/hello_world.f
+"""
+
+# These are the platforms we will build for by default, unless further
+# platforms are passed in on the command line
+platforms = expand_gfortran_versions(supported_platforms())
+
+# The products that we will ensure are always built
+products = [
+    ExecutableProduct("hello_world", :hello_world),
+]
+
+# 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)

H/HelloWorldGo/build_tarballs.jl

@@ -0,0 +1,30 @@
+using BinaryBuilder
+
+name = "HelloWorldGo"
+version = v"1.0.0"
+
+# No sources, we're just building the testsuite
+sources = [
+]
+
+# Bash recipe for building across all platforms
+script = raw"""
+mkdir -p ${prefix}/bin
+go build -o ${prefix}/bin/hello_world${exeext} /usr/share/testsuite/go/hello_world/hello_world.go
+"""
+
+# 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
+products = [
+    ExecutableProduct("hello_world", :hello_world),
+]
+
+# 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; compilers=[:c, :go])

H/HelloWorldRust/build_tarballs.jl

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+using BinaryBuilder
+
+name = "HelloWorldRust"
+version = v"1.0.0"
+
+# No sources, we're just building the testsuite
+sources = [
+]
+
+# Bash recipe for building across all platforms
+script = raw"""
+mkdir -p ${prefix}/bin
+rustc -o ${prefix}/bin/hello_world${exeext} -g /usr/share/testsuite/rust/hello_world/hello_world.rs
+"""
+
+# We build for a restricted set of platforms, because our rust toolchain is a little broken
+platforms = supported_platforms()
+
+# First, FreeBSD has -fPIC problems when linking in `crt.o`
+filter!(p -> !isa(p, FreeBSD), platforms)
+
+# Next, :musl libcs have a hard time linking
+filter!(p -> libc(p) != :musl, platforms)
+
+# Finally, windows seems to be broken
+# https://github.com/JuliaPackaging/BinaryBuilder.jl/issues/499
+filter!(p -> !isa(p, Windows), platforms)
+
+# The products that we will ensure are always built
+products = [
+    ExecutableProduct("hello_world", :hello_world),
+]
+
+# 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; compilers=[:c, :rust])