Add a proper build system

FossilOrigin-Name: 8679c61b2c82da9daa316ed5eb90ba1b69e608127afa318cbdbff56b53d65a74

configure.ac

@@ -0,0 +1,88 @@
+AC_INIT(ObjPgSQL, 0.1, js@webkeks.org)
+BUILDSYS_INIT
+
+AC_CONFIG_SRCDIR(src)
+
+AC_CHECK_TOOL(OBJFW_CONFIG, objfw-config)
+AS_IF([test x"$OBJFW_CONFIG" = x""], [
+	AC_MSG_ERROR(You need ObjFW and objfw-config installed!)
+])
+
+test x"$OBJC" = x"" && OBJC="$($OBJFW_CONFIG --objc)"
+
+AC_LANG([Objective C])
+AC_PROG_OBJC
+AC_PROG_OBJCPP
+AC_PROG_LN_S
+AC_PROG_INSTALL
+
+CPP="$OBJCPP"
+CPPFLAGS="$CPPFLAGS $OBJCPPFLAGS $($OBJFW_CONFIG --cppflags)"
+OBJCFLAGS="$OBJCFLAGS $($OBJFW_CONFIG --objcflags)"
+LDFLAGS="$LDFLAGS $($OBJFW_CONFIG --ldflags)"
+LIBS="$LIBS $($OBJFW_CONFIG --libs)"
+
+AC_CHECK_TOOL(AR, ar)
+AC_PROG_RANLIB
+AC_ARG_ENABLE(shared,
+	AS_HELP_STRING([--disable-shared], [do not build shared library]))
+AS_IF([test x"$enable_shared" != x"no"], [
+	BUILDSYS_SHARED_LIB
+	AC_SUBST(OBJPGSQL_SHARED_LIB, "${LIB_PREFIX}objpgsql${LIB_SUFFIX}")
+	AC_SUBST(EXCEPTIONS_LIB_A, "exceptions.lib.a")
+	AC_SUBST(EXCEPTIONS_EXCEPTIONS_LIB_A, "exceptions/exceptions.lib.a")
+])
+AC_ARG_ENABLE(static, AS_HELP_STRING([--enable-static], [build static library]))
+AS_IF([test x"$enable_static" = x"yes" -o x"$enable_shared" = x"no"], [
+	AC_SUBST(OBJPGSQL_STATIC_LIB, "libobjpgsql.a")
+	AC_SUBST(EXCEPTIONS_A, "exceptions.a")
+	AC_SUBST(EXCEPTIONS_EXCEPTIONS_A, "exceptions/exceptions.a")
+])
+
+AC_CHECK_LIB(pq, main, [
+	LIBS="$LIBS -lpq"
+], [
+	AC_MSG_ERROR(You need PostgreSQL and libpq installed!)
+])
+
+AS_IF([test x"$GOBJC" = x"yes"], [
+	OBJCFLAGS="$OBJCFLAGS -Wall -Werror -Wwrite-strings -Wpointer-arith"
+
+	old_OBJCFLAGS="$OBJCFLAGS"
+	OBJCFLAGS="$OBJCFLAGS -Wcast-align"
+	AC_MSG_CHECKING(whether -Wcast-align is buggy)
+	AC_TRY_COMPILE([
+		#ifdef __has_attribute
+		# if __has_attribute(objc_root_class)
+		__attribute__((__objc_root_class__))
+		# endif
+		#endif
+		@interface Foo
+		{
+			struct objc_class *_isa;
+		}
+		@end
+
+		@implementation Foo
+		- (void)foo
+		{
+			struct objc_class *c = _isa;
+			(void)c;
+		}
+		@end
+	], [
+	], [
+		AC_MSG_RESULT(no)
+	], [
+		AC_MSG_RESULT(yes)
+		OBJCFLAGS="$old_OBJCFLAGS"
+	])
+])
+
+dnl We don't call AC_PROG_CPP, but only AC_PROG_OBJCPP and set CPP to OBJCPP
+dnl and add OBJCPPFLAGS to CPPFLAGS, thus we need to AC_SUBST these ourself.
+AC_SUBST(CPP)
+AC_SUBST(CPPFLAGS)
+
+AC_CONFIG_FILES([buildsys.mk extra.mk])
+AC_OUTPUT