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Subject: bug#31198: 25.1; Semantic fails to find system include (header) files
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GNU Emacs 25.1.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.18.9)
System Description: CentOS release 6.4 (Final)
Summary
=======
Semantic fails to locate C/C++ system header files when a system
header file in turn uses double quotes instead of angle brackets in
include statements.
Example
=======
Assume the trivial C++ source file Foo.cpp that just contains a single
include statement
---- 8< -----
#include <QFile>
---- 8< -----
The system include path for the ede-cpp-project points to the
directory /usr/include and Semantic is able to properly locate the
QFile header in /usr/include/QtCore/.
However, the header file /usr/include/QtCore/QFile contains only a
single include statement that points to the file qfile.h. This include
statement uses double quotes instead of angle brackets, i.e. the
contents of the file QFile is
---- 8< -----
#include "qfile.h"
---- 8< -----
What happens is that Semantic gets confused since the include
statement is using the syntax for local include files instead of
system include files. Thus Semantic is unable to locate qfile.h header
since it is located in the system include directory
/usr/include/QtCore and the project local include path does not
include this directory (and it should not need to do that).
Proposed solution
=================
When a system include/header file (a header file found via system
include path) uses double quotes Semantic should treat the include
statement as if it really was using angle brackets instead of double
quotes and thus be able to properly locate qfile.h via QFile. As it is
now Semantic will always mark the row with the #include <QFile> as a
not parsed header. That is, within "system header files" (header files
that are located via the system include path) include statements using
angle bracket and double quote are synonyms with each other.
This change in Semantic behavior could be controlled via a setting
that is default off in order to be backward compatible.
Note: If the Foo.cpp example source file instead looked like this
---- 8< -----
#include <qfile.h>
---- 8< -----
Semantic is able to locate the qfile.h header file and parse it.
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: johol@HIDDEN Subject: bug#31198: Acknowledgement (25.1; Semantic fails to find system include (header) files) Message-ID: <handler.31198.B.15239771967411.ack <at> debbugs.gnu.org> References: <20180417100030.Horde.OolrEdLzMW9x9fJ3WI_fesU@HIDDEN> X-Gnu-PR-Message: ack 31198 X-Gnu-PR-Package: emacs Reply-To: 31198 <at> debbugs.gnu.org Date: Tue, 17 Apr 2018 15:00:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 31198 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 31198: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D31198 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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