3447 - drop dependence on GNU make

A generic build system is overkill for such a small project, and it was
adding complexity on OpenBSD which doesn't come with GNU make by
default.

In the process we also eliminate our reliance on bash and perl, at least
for the core build script.

1 files changed, 117 insertions, 0 deletions

diff --git a/build b/build
new file mode 100755
index 00000000..86f9fa5f
--- /dev/null
+++ b/build
@@ -0,0 +1,117 @@
+#!/bin/sh
+set -e  # stop immediately on error
+
+# [0-9]*.cc -> mu.cc -> .build/*.cc -> .build/*.o -> .build/mu_bin
+# (layers)   |        |              |             |
+#          tangle  cleave          $CXX          $CXX
+
+test $CXX || export CXX=c++ 
+test $CC || export CC=cc
+test $CFLAGS || export CFLAGS="-g -O3"
+export CFLAGS="$CFLAGS -Wall -Wextra -ftrapv -fno-strict-aliasing"
+
+# return 1 if $1 is older than _any_ of the remaining args
+older_than() {
+  target=$1
+  shift
+  if [ ! -e $target ]
+  then 
+#?     echo "$target doesn't exist"
+    echo "updating $target" >&2
+    return 1
+  fi
+  for f in $*
+  do
+    if [ $f -nt $target ]
+    then
+      echo "updating $target" >&2
+      return 1
+    fi
+  done
+  return 0
+}
+
+noisy_cd() {
+  cd $1
+  echo "-- `pwd`" >&2
+}
+
+older_than enumerate/enumerate enumerate/enumerate.cc || {
+  $CXX $CFLAGS enumerate/enumerate.cc -o enumerate/enumerate
+}
+
+noisy_cd tangle
+  older_than type_list [0-9]*.cc || {
+    grep -h "^struct .* {" [0-9]*.cc |sed 's/\(struct *[^ ]*\).*/\1;/' > type_list
+    grep -h "^typedef " [0-9]*.cc >> type_list
+  }
+  older_than function_list [0-9]*.cc || {
+    grep -h "^[^ #].*) {" [0-9]*.cc |sed 's/ {.*/;/' > function_list
+  }
+  older_than file_list [0-9]*.cc || {
+    ls [0-9]*.cc |grep -v "\.test\.cc$" |sed 's/.*/#include "&"/' > file_list
+  }
+  older_than test_file_list [0-9]*.test.cc || {
+    ls [0-9]*.test.cc |sed 's/.*/#include "&"/' > test_file_list
+  }
+  older_than test_list [0-9]*.cc || {
+    grep -h "^[[:space:]]*void test_" [0-9]*.cc |sed 's/^\s*void \(.*\)() {$/\1,/' > test_list
+  }
+  older_than tangle boot.cc *_list || {
+    $CXX $CFLAGS boot.cc -o tangle
+  }
+noisy_cd ..
+
+LAYERS=$(./enumerate/enumerate --until zzz |grep -v '.mu$')
+older_than mu.cc $LAYERS enumerate/enumerate tangle/tangle || {
+  ./tangle/tangle $LAYERS > mu.cc
+}
+older_than function_list mu.cc || {
+  grep -h "^[^[:space:]#].*) {$" mu.cc |grep -v ":.*(" |sed 's/ {.*/;/' > function_list
+}
+older_than test_list mu.cc || {
+  grep -h "^\s*void test_" mu.cc |sed 's/^\s*void \(.*\)() {.*/\1,/' > test_list
+}
+
+older_than cleave/cleave cleave/cleave.cc || {
+  $CXX -O3 -Wall -Wextra -fno-strict-aliasing cleave/cleave.cc -o cleave/cleave
+  rm -rf .build
+}
+
+older_than mu_bin mu.cc *_list cleave/cleave || {
+  mkdir -p .build
+  cp function_list test_list .build
+  mkdir -p .build/termbox
+  cp termbox/termbox.h .build/termbox
+  ./cleave/cleave mu.cc .build
+  noisy_cd .build
+    older_than global_declarations_list global_definitions_list || {
+      grep ';' global_definitions_list |sed 's/[=(].*/;/' |sed 's/^[^\/# ]/extern &/' |sed 's/^extern extern /extern /' > global_declarations_list
+    }
+    for f in mu_*.cc
+    do
+      older_than `echo $f |sed 's/\.cc$/.o/'` $f || {
+        $CXX $CFLAGS -c $f
+      }
+    done
+  noisy_cd ../termbox
+    older_than utf8.o utf8.c || {
+      $CC $CFLAGS -c utf8.c
+    }
+    older_than termbox.o termbox.c termbox.h input.inl output.inl bytebuffer.inl || {
+      $CC $CFLAGS -c termbox.c
+    }
+    older_than libtermbox.a *.o || {
+      ar rcs libtermbox.a *.o
+    }
+  noisy_cd ..
+  $CXX .build/*.o termbox/libtermbox.a -o .build/mu_bin
+  cp .build/mu_bin .
+}
+
+## [0-9]*.mu -> core.mu
+
+MU_LAYERS=$(./enumerate/enumerate --until zzz |grep '.mu$')
+older_than core.mu $MU_LAYERS || {
+  cat $MU_LAYERS > core.mu
+}