From 0b190cc8fbca0f970eadd8c0f1d5792c41f71cf6 Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Mon, 12 Aug 2013 13:18:37 -0700
Subject: [PATCH] Add a configure script

The primary motivation is a new install target. And it's just plain
rude to provide an install target without also supporting --prefix and
DESTDIR, so we need this simple configure script at least.
---
 .gitignore |   3 +
 Makefile   |  40 +++++++-
 configure  | 261 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 301 insertions(+), 3 deletions(-)
 create mode 100755 configure

diff --git a/.gitignore b/.gitignore
index 463ea60..52ed726 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 lib32
 lib64
+libglaze.so*
+Makefile.config
+*~
diff --git a/Makefile b/Makefile
index c9db5c8..3ccb7fa 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,18 @@
-CC	?= gcc
-CFLAGS	?= -g
-CFLAGS	+= -Wall -Wextra -Wmissing-declarations -Werror=attributes
+LIBGLAZE_VERSION_MAJOR   = 0
+LIBGLAZE_VERSION_MINOR   = 0
+LIBGLAZE_VERSION_RELEASE = 0
+
+LIBGLAZE_LINKER_NAME = libglaze.so
+LIBGLAZE_SONAME = $(LIBGLAZE_LINKER_NAME).$(LIBGLAZE_VERSION_MAJOR)
+LIBGLAZE_LIBNAME = $(LIBGLAZE_SONAME).$(LIBGLAZE_VERSION_MINOR).$(LIBGLAZE_VERSION_RELEASE)
 
 TARGETS = lib64/libGL.so.1 lib32/libGL.so.1
 
 all: $(TARGETS)
 
+$(LIBGLAZE_LIBNAME): glaze.c
+	$(CC) $(CFLAGS) -fPIC -shared -Wl,-Bsymbolic,-soname=$(LIBGLAZE_SONAME) -o $@ $<
+
 lib64/libGL.so.1: glaze-gl.c glapi.def
 	mkdir -p lib64
 	$(CC) $(CFLAGS) -m64 -fPIC -shared -Wl,-Bsymbolic -o $@ $<
@@ -14,5 +21,32 @@ lib32/libGL.so.1: glaze-gl.c specs/gl.def
 	mkdir -p lib32
 	$(CC) $(CFLAGS) -m32 -fPIC -shared -Wl,-Bsymbolic -o $@ $<
 
+.PHONY: install
+install: all
+	mkdir -p $(DESTDIR)$(LIBDIR)/glaze/lib64
+	install -m0644 lib64/libGL.so.1 $(DESTDIR)$(LIBDIR)/glaze/lib64
+	mkdir -p $(DESTDIR)$(LIBDIR)/glaze/lib32
+	install -m0644 lib32/libGL.so.1 $(DESTDIR)$(LIBDIR)/glaze/lib32
+
 clean:
 	rm -f $(TARGETS)
+
+# Get settings from the output of configure by running it to generate
+# Makefile.config if it doesn't exist yet.
+
+# If Makefile.config doesn't exist, then srcdir won't be
+# set. Conditionally set it (assuming a plain srcdir build) so that
+# the rule to generate Makefile.config can actually work.
+srcdir ?= .
+
+include Makefile.config
+Makefile.config: $(srcdir)/configure
+ifeq ($(configure_options),)
+	@echo ""
+	@echo "Note: Calling ./configure with no command-line arguments. This is often fine,"
+	@echo "      but if you want to specify any arguments (such as an alternate prefix"
+	@echo "      into which to install), call ./configure explicitly and then make again."
+	@echo "      See \"./configure --help\" for more details."
+	@echo ""
+endif
+	$(srcdir)/configure $(configure_options)
diff --git a/configure b/configure
new file mode 100755
index 0000000..6195562
--- /dev/null
+++ b/configure
@@ -0,0 +1,261 @@
+#! /bin/sh
+
+PROJECT=glaze
+PROJECT_BLURB="a shiny way to wrap OpenGL"
+
+srcdir=$(dirname "$0")
+
+# For a non-srcdir configure invocation (such as ../configure), create
+# the directory structure and copy Makefiles.
+if [ "$srcdir" != "." ]; then
+
+    for dir in . $(grep "^subdirs *=" "$srcdir"/Makefile | sed -e "s/subdirs *= *//"); do
+	mkdir -p "$dir"
+	cp "$srcdir"/"$dir"/Makefile.local "$dir"
+	cp "$srcdir"/"$dir"/Makefile "$dir"
+    done
+fi
+
+# Set several defaults (optionally specified by the user in
+# environment variables)
+CC=${CC:-gcc}
+CFLAGS=${CFLAGS:--O2}
+LDFLAGS=${LDFLAGS:-}
+
+# Set the defaults for values the user can specify with command-line
+# options.
+PREFIX=/usr/local
+
+usage ()
+{
+    cat <<EOF
+Usage: ./configure [options]...
+
+This script configures ${PROJECT} to build on your system.
+
+It verifies that dependencies are available, determines flags needed
+to compile and link against various required libraries, and identifies
+whether various system functions can be used or if locally-provided
+replacements will be built instead.
+
+Finally, it allows you to control various aspects of the build and
+installation process.
+
+First, some common variables can specified via environment variables:
+
+	CC		The C compiler to use
+	CFLAGS		Flags to pass to the C compiler
+	LDFLAGS		Flags to pass when linking
+
+Each of these values can further be controlled by specifying them
+later on the "make" command line.
+
+Additionally, various options can be specified on the configure
+command line.
+
+	--prefix=PREFIX	Install files in PREFIX [$PREFIX]
+
+By default, "make install" will install the resulting program to
+$PREFIX/bin, documentation to $PREFIX/man, etc. You can
+specify an installation prefix other than $PREFIX using
+--prefix, for instance:
+
+	./configure --prefix=\$HOME
+
+Fine tuning of some installation directories is available:
+
+	--bindir=DIR		Install executables to DIR [PREFIX/bin]
+	--libdir=DIR		Install libraries to DIR [PREFIX/lib]
+	--mandir=DIR		Install man pages to DIR [PREFIX/share/man]
+	--sysconfdir=DIR	Read-only single-machine data [PREFIX/etc]
+
+Additional options are accepted for compatibility with other
+configure-script calling conventions, but don't do anything yet:
+
+	--build=<cpu>-<vendor>-<os>	Currently ignored
+	--host=<cpu>-<vendor>-<os>	Currently ignored
+	--infodir=DIR			Currently ignored
+	--datadir=DIR			Currently ignored
+	--localstatedir=DIR		Currently ignored
+	--libexecdir=DIR		Currently ignored
+	--disable-maintainer-mode	Currently ignored
+	--disable-dependency-tracking	Currently ignored
+
+EOF
+}
+
+# Parse command-line options
+for option; do
+    if [ "${option}" = '--help' ] ; then
+	usage
+	exit 0
+    elif [ "${option%%=*}" = '--prefix' ] ; then
+	PREFIX="${option#*=}"
+    elif [ "${option%%=*}" = '--bindir' ] ; then
+	BINDIR="${option#*=}"
+    elif [ "${option%%=*}" = '--libdir' ] ; then
+	LIBDIR="${option#*=}"
+    elif [ "${option%%=*}" = '--mandir' ] ; then
+	MANDIR="${option#*=}"
+    elif [ "${option%%=*}" = '--sysconfdir' ] ; then
+	SYSCONFDIR="${option#*=}"
+    elif [ "${option%%=*}" = '--build' ] ; then
+	true
+    elif [ "${option%%=*}" = '--host' ] ; then
+	true
+    elif [ "${option%%=*}" = '--infodir' ] ; then
+	true
+    elif [ "${option%%=*}" = '--datadir' ] ; then
+	true
+    elif [ "${option%%=*}" = '--localstatedir' ] ; then
+	true
+    elif [ "${option%%=*}" = '--libexecdir' ] ; then
+	true
+    elif [ "${option}" = '--disable-maintainer-mode' ] ; then
+	true
+    elif [ "${option}" = '--disable-dependency-tracking' ] ; then
+	true
+    else
+	echo "Unrecognized option: ${option}"
+	echo "See:"
+	echo "	$0 --help"
+	echo ""
+	exit 1
+    fi
+done
+
+printf "Checking for working C compiler (${CC})... "
+printf "int main(void){return 42;}\n" > minimal.c
+if ${CC} -o minimal minimal.c > /dev/null 2>&1
+then
+    printf "Yes.\n"
+else
+    printf "No.\n"
+    cat <<EOF
+
+*** Error: No functioning C compiler found. Either set the CC environment
+to a working C compiler, or else install gcc:
+
+	http://gcc.gnu.org/
+
+You may be able to install gcc with a command such as:
+
+	sudo apt-get install build-essential
+    or:
+	sudo yum install make automake gcc gcc-c++ kernel-devel
+
+EOF
+
+exit 1
+
+fi
+
+WARN_CFLAGS=""
+printf "Checking for available C compiler warning flags:\n"
+for flag in -Wall -Wextra -Wmissing-declarations -Werror=attributes; do
+    if ${CC} $flag -o minimal minimal.c > /dev/null 2>&1
+    then
+	WARN_CFLAGS="${WARN_CFLAGS}${WARN_CFLAGS:+ }${flag}"
+    fi
+done
+printf "\t${WARN_CFLAGS}\n"
+
+rm -f minimal minimal.c
+
+printf "#include <features.h>\nint main(void){return 0;}\n" > arch-minimal.c
+
+printf "Checking for machine-dependent compiler support:\n"
+
+printf "	Compiler can create 32-bit binaries... "
+have_m32=Yes
+if ${CC} -m32 -o arch-minimal arch-minimal.c > /dev/null 2>&1
+then
+    printf "Yes.\n"
+else
+    printf "No.\n"
+    have_m32=No
+fi
+
+printf "	Compiler can create 64-bit binaries... "
+have_m64=Yes
+if ${CC} -m64 -o arch-minimal arch-minimal.c > /dev/null 2>&1
+then
+    printf "Yes.\n"
+else
+    printf "No.\n"
+    have_m64=No
+fi
+
+if [ "$have_m32" = "No" ] || [ "$have_m64" = "No" ]; then
+    cat <<EOF
+
+* Warning: Cannot create both 32 and 64-bit glaze libraries. Glaze will not
+           support applications of the non-native size. Fixing this may be
+           as simple as running a command such as:
+
+		sudo apt-get install gcc-multilib
+EOF
+fi
+
+rm -f arch-minimal arch-minimal.c
+
+cat <<EOF
+
+You may now run the following commands to compile and install ${PROJECT}:
+
+	make
+	sudo make install
+
+EOF
+
+# construct the Makefile.config
+cat > Makefile.config <<EOF
+# This Makefile.config was automatically generated by the ./configure
+# script of ${PROJECT}. If the configure script identified anything
+# incorrectly, then you can edit this file to try to correct things,
+# but be warned that if configure is run again it will destroy your
+# changes, (and this could happen by simply calling "make" if the
+# configure script is updated).
+
+# The top-level directory for the source, (the directory containing
+# the configure script). This may be different than the build
+# directory (the current directory at the time configure was run).
+srcdir = ${srcdir}
+
+configure_options = $@
+
+# We use vpath directives (rather than the VPATH variable) since the
+# VPATH variable matches targets as well as prerequisites, (which is
+# not useful since then a target left-over from a srcdir build would
+# cause a target to not be built in the non-srcdir build).
+vpath % \$(srcdir)
+
+# The C compiler to use
+CC = ${CC}
+
+# Default FLAGS for C compiler (can be overridden by user such as "make CFLAGS=-g")
+CFLAGS = ${CFLAGS}
+
+# Default FLAGS for the linker (can be overridden by user such as "make LDFLAGS=-znow")
+LDFLAGS = ${LDFLAGS}
+
+# Flags to enable warnings when using the C compiler
+WARN_CFLAGS=${WARN_CFLAGS}
+
+# The prefix to which ${PROJECT} should be installed
+PREFIX = ${PREFIX}
+
+# The directory to which executables should be installed
+BINDIR = ${BINDIR:=\$(PREFIX)/bin}
+
+# The directory to which libraries should be installed
+LIBDIR = ${LIBDIR:=\$(PREFIX)/lib}
+
+# The directory to which headers should be installed
+INCLUDEDIR = ${INCLUDEDIR:=\$(PREFIX)/include}
+
+# Whether compiler can create 32 or 64-bit binaries
+COMPILER_SUPPORTS_32 = ${have_m32}
+COMPILER_SUPPORTS_64 = ${have_m64}
+
+EOF
-- 
2.43.0