Add build script forgotten in last commit.

diff --git a/build.sh b/build.sh
new file mode 100755 (executable)
index 0000000..dcba4ba
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,41 @@
+#!/bin/sh
+
+# This file is part of PlomRogue. PlomRogue is licensed under the GPL version 3
+# or any later version. For details on its copyright, license, and warranties,
+# see the file NOTICE in the root directory of the PlomRogue source package.
+
+set -e
+
+OFLAG='-O3'
+CFLAGS="-std=c11 -pedantic-errors -Wall -Werror -Wextra -Wformat-security $OFLAG"
+
+# For non-GNU gcc masks, drop all gcc-specific debugging flags.
+test=`stat --version 2>&1 | grep 'Free Software Foundation' | wc -l`
+if [ 1 -gt $test ]
+then
+    CFLAGS=$OFLAG
+fi
+
+# Some tests: for gcc, and certain necessary header files.
+test=`command -v gcc | wc -l`
+if [ 1 != $test ]
+then
+    echo "FAILURE:"
+    echo "No gcc installed, but it's needed!"
+    exit 1
+fi
+test_header() {
+    code="#include <$1>"
+    test=`echo $code | cpp -H -o /dev/null 2>&1 | head -n1 | grep error | wc -l`
+    if [ 0 != $test ]
+    then
+        echo "FAILURE:"
+        echo "No $1 header file found, but it's needed!"
+        echo "Maybe install some $2 package?"
+        exit 1
+    fi
+}
+test_header stdlib.h libc6-dev      # Assume stdlib.h guarantees full libc6-dev.
+
+# Compilation proper.
+gcc -shared -fPIC $CFLAGS -o libplomrogue.so libplomrogue.c -lm