From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fredrik Kuivinen Subject: [PATCH] Makefile: Use computed header dependencies if the compiler supports it Date: Tue, 28 Jun 2011 11:21:25 +0200 Message-ID: <1309252885-14361-1-git-send-email-frekui@gmail.com> Cc: Fredrik Kuivinen To: git@vger.kernel.org X-From: git-owner@vger.kernel.org Tue Jun 28 11:24:10 2011 Return-path: Envelope-to: gcvg-git-2@lo.gmane.org Received: from vger.kernel.org ([209.132.180.67]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1QbUWf-0007vn-Mg for gcvg-git-2@lo.gmane.org; Tue, 28 Jun 2011 11:24:10 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756843Ab1F1JW5 (ORCPT ); Tue, 28 Jun 2011 05:22:57 -0400 Received: from mail-bw0-f46.google.com ([209.85.214.46]:62163 "EHLO mail-bw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756823Ab1F1JVs (ORCPT ); Tue, 28 Jun 2011 05:21:48 -0400 Received: by bwd5 with SMTP id 5so24312bwd.19 for ; Tue, 28 Jun 2011 02:21:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer; bh=4HFsDvEIVR+qTqd/aKlQbgCedUPPiF5laVhQRGASTdc=; b=glanNvctNWR96NFErhLiOVv0AZNXsv0bT04FQa8N/wgj5W+DiGGVKHSc4PXQ4PqhAx deWuhKes0EhnwkM9bYsnScHG1dC3P/c1LcRARILcA4dN4RXEVhIxhkxD1RYF3zoeDcUR Ran6NmRGYedtvU78bPasaCsHvHyaFxcbBLO3Y= Received: by 10.204.65.19 with SMTP id g19mr5328609bki.49.1309252906818; Tue, 28 Jun 2011 02:21:46 -0700 (PDT) Received: from localhost.localdomain (c83-250-151-53.bredband.comhem.se [83.250.151.53]) by mx.google.com with ESMTPS id l24sm517bkw.15.2011.06.28.02.21.45 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 28 Jun 2011 02:21:46 -0700 (PDT) X-Mailer: git-send-email 1.7.5.3.368.g8b1b7.dirty Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: Previously you had to manually define COMPUTE_HEADER_DEPENDENCIES to enable this feature. It seemed a bit sad that such a useful feature had to be enabled manually. Signed-off-by: Fredrik Kuivinen --- Makefile | 13 +++++++++---- 1 files changed, 9 insertions(+), 4 deletions(-) diff --git a/Makefile b/Makefile index e40ac0c..3b9efac 100644 --- a/Makefile +++ b/Makefile @@ -243,10 +243,6 @@ all:: # DEFAULT_EDITOR='$GIT_FALLBACK_EDITOR', # DEFAULT_EDITOR='"C:\Program Files\Vim\gvim.exe" --nofork' # -# Define COMPUTE_HEADER_DEPENDENCIES if your compiler supports the -MMD option -# and you want to avoid rebuilding objects when an unrelated header file -# changes. -# # Define CHECK_HEADER_DEPENDENCIES to check for problems in the hard-coded # dependency rules. # @@ -1211,6 +1207,15 @@ endif ifdef CHECK_HEADER_DEPENDENCIES COMPUTE_HEADER_DEPENDENCIES = USE_COMPUTED_HEADER_DEPENDENCIES = +else +dep_check = $(shell sh -c \ + ': > ++empty.c; \ + $(CC) -c -MF /dev/null -MMD -MP ++empty.c -o /dev/null 2>&1; \ + echo $$?; \ + $(RM) ++empty.c') +ifeq ($(dep_check),0) +COMPUTE_HEADER_DEPENDENCIES=YesPlease +endif endif ifdef COMPUTE_HEADER_DEPENDENCIES -- 1.7.5.3.368.g8b1b7.dirty