DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D44D93858C83
From: Ronald Hoogenboom <RHoogenboom AT irdeto DOT com>
To: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>,
        The Cygwin Mailing List
 <cygwin AT cygwin DOT com>
Subject: RE: makedepend does not honor UNC path for -I and -Y
Thread-Topic: makedepend does not honor UNC path for -I and -Y
Thread-Index: AdgYVdmHPIjOEui+TwG8UCMBqDeedQDI3DUAACGxZ9A=
Date: Mon, 7 Feb 2022 08:59:09 +0000
Message-ID: <AS4PR07MB8529DCF2E142A11DB872CB1ACD2C9@AS4PR07MB8529.eurprd07.prod.outlook.com>
References: <AS4PR07MB852964A556F11077692DA09BCD279 AT AS4PR07MB8529 DOT eurprd07 DOT prod DOT outlook DOT com>
 <52f465fd-1e35-4205-81b7-8a362b771c90 AT dronecode DOT org DOT uk>
In-Reply-To: <52f465fd-1e35-4205-81b7-8a362b771c90@dronecode.org.uk>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?utf-8?B?SEJVdEVBcHRtVmFQRWRUQ2xHTjdWSmd5T0xIVDV3N01WbTJlbU9BSUhqblh6?=
 =?utf-8?B?bHBlYk5Kd09KODVFQlZOcVdCM0tOTEZKbHRSbENRQUxvSzMyS0ZaRWE2VlFi?=
 =?utf-8?B?MGtkSlJVdXVJcjhqRVluYm5wZHh5dm9DVFgvMDdxN282bE9DZmE3ZUdCMTZl?=
 =?utf-8?B?YWF4dm1Pd3VVeWpOT0dLTExEb01WMnJmQVRZUHJSYVF2MGN5YXNjbmVZRmFH?=
 =?utf-8?B?V0hCS0h6ZnZaRXNXeXRYeXRHbTZhZzN1WFBQVXpLVnNuOXZqVDJWUFBDUlpw?=
 =?utf-8?B?T3k3TUtPYTA5VDBkajlmVmMvV2VWUElJS0ZqT1NKbHhmS1NMTHh2TjJPU085?=
 =?utf-8?B?MG1FZWhyeG9UWmdwR2orQytMVzJQNzkrVm5tR3R2TmtNSlhhSWlJMVdTbUFs?=
 =?utf-8?B?QmtYRHVBeDBhVWxPUkt5VXdmcWtuYTF4NnlUTlFjeXg5NUZGaFYva1lzNUJk?=
 =?utf-8?B?U0NSREMrVmtzRnBxMnpPYVdpMWI0OVFTR0RjcDUvOW0rcjlDMXdSem5BeGds?=
 =?utf-8?B?REYzOHJyK2tDZ3YvbXM3bEFOUGJpWTYxQmd2d0ZDMmprOTcwby9iMEFmcUdw?=
 =?utf-8?B?Sis4clV1OUtCdER4blZHWkg5R1IxbzI4Y1VDaEEzdHNnSXErQkU5ZUNMajBa?=
 =?utf-8?B?VXU1dytPSituV1dXZUM0dEE2T1hyRml5R2xUQ0RESkZOVmFLaEgreTloMkwz?=
 =?utf-8?B?VEN4anhDUnczOGRTNjVsMzM4RE15UVFwY0hYYjRSSktSck90SU1QTGhjSnhq?=
 =?utf-8?B?OFVSNDhZTHZ5RWJSMDBUZStQdHltd2JGSlUyMS9CUUViRGg2bTc3bFIxT1JP?=
 =?utf-8?B?eFIzWWc2MWJuZGl3YjhVM2lnSWVVT2g4QUZVbDJraitWbDVSTnlXTWpYTEFS?=
 =?utf-8?B?Wk4rSDRqaWprQVNzekh6WnV4WGx6ZjdlNWs3dmxVV3N1cVA4YVJoVUdUeUtS?=
 =?utf-8?B?Q0JJOHhOMkJNTm5uSnhyQ3B0MDJUNjQ2aUtFZzgwUG05S05PblZoeWc3WFh6?=
 =?utf-8?B?WFEySjZONHBia0RDdk8xQWkxY294aGtrYkxWZVVTMFpsbTdXWkxKVFRQa0hu?=
 =?utf-8?B?aUwrQy8xYndZdk1QV1pwNURteXIrU0hlWFdpK0k1YWZBL1Q4LzI1d3lLU2FV?=
 =?utf-8?B?d2xNQ0VtNjRQZXpUQ1FXWDZPcnN5emdIbFFZejd6VEFuVVIvYTk0SWcwWjI0?=
 =?utf-8?B?dUEwOGk4dFAvUmRSaCtEbWQrM21TVHZZZWlSYnBkUDBrOVZjc3pHZXJuL3hM?=
 =?utf-8?B?b1gxR2ROQmx2a3NMd2dtODVra01WWXhFR0JpaCt2czVMcGZJQ2ZqZnpCM2lN?=
 =?utf-8?B?bDBjaGNrOXRHRjJJN3pVZllsZUlQVW9rdXhUQlhvVE04dHkwZlZYZWRJTzcx?=
 =?utf-8?B?cDFhaFk3cHNPMFpNd0hvTDg0dDdGbTVtY0ZnY1F2dlh5dDA1VFVZeVB1QUxJ?=
 =?utf-8?B?U3Nya1NyVTNKNFpKQ1QvcnlZbGRBSVlscmVxQnpjZzZyUXlGVnN5T3AvcVJQ?=
 =?utf-8?B?cUkyT05sdUI3OXpoT01jblNla25UV0UrTWZScjZFTHFjemlVTUF0K3ZNclV2?=
 =?utf-8?B?aXlMNTlxbU8xajlublJXdUZwRkNUbnBJVWFna25QRFVhelZJUmZaVGdEVk5h?=
 =?utf-8?B?UmVJRytpdjlneWJEY0dRZlQ4VlhURWVtU3o3SmNBU0lvUFZFc3Btem52bytn?=
 =?utf-8?B?eTU1dHAzVlZUL0wrQkpBd0E2VnlDZ2g2S21FTWpLWm1tMk1TSFhjdUJIUXhi?=
 =?utf-8?B?aE14L3c4dHF1R1BMZjlGUm9qRmZ6cjdDZk11akxkcnN0TStTMEdNMGZ3Z0hh?=
 =?utf-8?B?MERUYjdhc2JZanJaSmwyRG8xaTJVakUrZVFlemRoZkpjbm1pRXRXclhIU1Zo?=
 =?utf-8?B?Rk1Oc2E1RGZQSTlkY2VjWWV2MlkrdzYwejA5ZHEvVDVJd0JTQmZpblNNNWM5?=
 =?utf-8?B?ZmJERmtSSEExelZKZFc1WWw1Y09DZEpLV3c4Z093MXRzY0dCUEtNdHZaS2N5?=
 =?utf-8?B?ZTVoeEhIYlo1UWhBQzcxM21TS2ExREpLWDU5VzdRNUowSE5DNDZNbWdHNlVZ?=
 =?utf-8?B?VWVyZnJsS3A0ZmIwTTVadjBEb1NuNkNON2F6TWRMQzNXRVZNZlhpZE5IOWN5?=
 =?utf-8?B?UitNOXl0UCtlTjd5ZURSYWp3czcvU2o4R0VYVHFmWEZNNU83MzE0cnhZNmJB?=
 =?utf-8?Q?6/NjdP1n3FTRjeknzOoZBWo=3D?=
MIME-Version: 1.0
X-OriginatorOrg: irdeto.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: AS4PR07MB8529.eurprd07.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 3729fab3-4997-4136-bc0d-08d9ea181abd
X-MS-Exchange-CrossTenant-originalarrivaltime: 07 Feb 2022 08:59:09.7611 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 68c9d1b8-4740-4457-bdba-bedf549fe343
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: yOHF5YbQ9gfNpIvD/gNfHv5alxe9/j1Y5RS3x4W8yjCuRnf6PUJwZ3FguFRQJ5SyjmUbp/ViPga9NkRACPM9kA==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: PR3PR07MB8129
X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00, DKIM_SIGNED,
 DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FORGED_SPF_HELO, SPF_HELO_PASS,
 SPF_NONE, TXREP,
 T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.29
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

Thanks, Jon.

I solved this by 'relativizing' paths before passing to makedepend using realpath --relative-to (from coreutils).
Since makedepend is not heavily used anymore now gcc has the -MMD option, I wonder if the maintainers are taking any pull requests... If they don't and I create a patch, will cygwin add it in their build process of tools?

-----Original Message-----
From: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk> 
Sent: Sunday, 6 February 2022 5:48 PM
To: Ronald Hoogenboom <RHoogenboom AT irdeto DOT com>; The Cygwin Mailing List <cygwin AT cygwin DOT com>
Subject: Re: makedepend does not honor UNC path for -I and -Y

On 02/02/2022 17:02, Ronald Hoogenboom wrote:
> cygwin makedepend collapses the double-slash UNC path prefix to one single slash. It fails to find headers via such search paths.
> 
> Cygwin 3.2.0-1 on windows server 2012 R2 makedepend 1.0.6

Thanks for reporting this.
I suspect that this is an upstream bug in makedepend, in that it does some canonicalization on paths, and assumes that '//' is the same as '/' 
everywhere in a path, which isn't true for an initial '//' (but happens to work on Linux, etc.)

See SUSv4 Base specifications, section 4.13 "Pathname Resolution" ([1], registration required):

"If a pathname begins with two successive <slash> characters, the first component following the leading <slash> characters may be interpreted in an implementation-defined manner, although more than two leading <slash> characters shall be treated as a single <slash> character."

Unfortunately, you're probably going to have to fix this yourself, if it's causing you problems.

Fortunately, makedepend is relatively small (See [2]).

[1]
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13
[2] https://gitlab.freedesktop.org/xorg/util/makedepend

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple