mirror of
https://github.com/SebastianWendel/nixpkgs.git
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0d422d5007
Use -Os rather than -O2 as our compilation flag, document why. Document why we always use gcc over clang. Fix openssl path in gambit. Stop trying to make static openssl.
97 lines
3.8 KiB
Nix
97 lines
3.8 KiB
Nix
{ stdenv, git, openssl, autoconf, pkgs, makeStaticLibraries, version, gcc, src, coreutils }:
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# Note that according to a benchmark run by Marc Feeley on May 2018,
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# clang is 10x (with default settings) to 15% (with -O2) slower than GCC at compiling
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# Gambit output, producing code that is 3x slower. IIRC the benchmarks from Gambit@30,
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# the numbers were still heavily in favor of GCC in October 2019.
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# Thus we use GCC over clang, even on macOS.
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# Also note that I (fare) just ran benchmarks from https://github.com/ecraven/r7rs-benchmarks
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# with Gambit 4.9.3 with -O1 vs -O2 vs -Os on Feb 2020. Which wins depends on the benchmark.
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# The fight is unclear between -O1 and -O2, where -O1 wins more often, by up to 17%,
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# but sometimes -O2 wins, once by up to 43%, so that overall -O2 is 5% faster.
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# However, -Os seems more consistent in winning slightly against both -O1 and -O2,
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# and is overall 15% faster than -O2. As for compile times, -O1 is fastest,
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# -Os is about 29%-33% slower than -O1, while -O2 is about 40%-50% slower than -O1.
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# Overall, -Os seems like the best choice, and that's what we now use.
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stdenv.mkDerivation rec {
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pname = "gambit";
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inherit version;
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inherit src;
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bootstrap = import ./bootstrap.nix ( pkgs );
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# TODO: if/when we can get all the library packages we depend on to have static versions,
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# we could use something like (makeStaticLibraries openssl) to enable creation
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# of statically linked binaries by gsc.
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buildInputs = [ git autoconf bootstrap openssl ];
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configureFlags = [
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"--enable-single-host"
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"--enable-c-opt=-Os"
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"--enable-gcc-opts"
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"--enable-shared"
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"--enable-absolute-shared-libs" # Yes, NixOS will want an absolute path, and fix it.
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"--enable-poll"
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"--enable-openssl"
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"--enable-default-runtime-options=f8,-8,t8" # Default to UTF-8 for source and all I/O
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# "--enable-debug" # Nope: enables plenty of good stuff, but also the costly console.log
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# "--enable-multiple-versions" # Nope, NixOS already does version multiplexing
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# "--enable-guide"
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# "--enable-track-scheme"
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# "--enable-high-res-timing"
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# "--enable-max-processors=4"
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# "--enable-multiple-vms"
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# "--enable-dynamic-tls"
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# "--enable-multiple-threaded-vms" # when SMP branch is merged in
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# "--enable-thread-system=posix" # default when --enable-multiple-vms is on.
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# "--enable-profile"
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# "--enable-coverage"
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# "--enable-inline-jumps"
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# "--enable-char-size=1" # default is 4
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];
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configurePhase = ''
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export CC=${gcc}/bin/gcc CXX=${gcc}/bin/g++ \
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CPP=${gcc}/bin/cpp CXXCPP=${gcc}/bin/cpp LD=${gcc}/bin/ld \
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XMKMF=${coreutils}/bin/false
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unset CFLAGS LDFLAGS LIBS CPPFLAGS CXXFLAGS
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./configure --prefix=$out ${builtins.concatStringsSep " " configureFlags}
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# OS-specific paths are hardcoded in ./configure
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substituteInPlace config.status \
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--replace /usr/local/opt/openssl/lib "${openssl.out}/lib" \
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--replace /usr/local/opt/openssl@1.1/lib "${openssl.out}/lib"
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./config.status
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'';
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buildPhase = ''
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# Make bootstrap compiler, from release bootstrap
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mkdir -p boot &&
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cp -rp ${bootstrap}/. boot/. &&
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chmod -R u+w boot &&
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cd boot &&
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cp ../gsc/makefile.in ../gsc/*.scm gsc && # */
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./configure &&
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for i in lib gsi gsc ; do (cd $i ; make ) ; done &&
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cd .. &&
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cp boot/gsc/gsc gsc-boot &&
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# Now use the bootstrap compiler to build the real thing!
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make -j2 from-scratch
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'';
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doCheck = true;
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meta = {
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description = "Optimizing Scheme to C compiler";
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homepage = "http://gambitscheme.org";
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license = stdenv.lib.licenses.lgpl2;
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# NB regarding platforms: only actually tested on Linux, *should* work everywhere,
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# but *might* need adaptation e.g. on macOS.
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platforms = stdenv.lib.platforms.unix;
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maintainers = with stdenv.lib.maintainers; [ thoughtpolice raskin fare ];
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};
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}
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