doc/html/node29.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">

<!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4
patched version by:  Kenshi Muto, Debian Project.
LaTeX2HTML 2002 (1.62),
original version by:  Nikos Drakos, CBLU, University of Leeds
* revised and updated by:  Marcus Hennecke, Ross Moore, Herb Swan
* with significant contributions from:
  Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
<HTML>
<HEAD>
<TITLE>3.2.2 Compiler Support</TITLE>
<META NAME="description" CONTENT="3.2.2 Compiler Support">
<META NAME="keywords" CONTENT="SCRAM">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">

<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4">
<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">

<LINK REL="STYLESHEET" HREF="SCRAM.css">

<LINK REL="previous" HREF="node26.html">
<LINK REL="up" HREF="node25.html">
<LINK REL="next" HREF="node30.html">
</HEAD>

<BODY bgcolor="beige" >
<!--Navigation Panel-->
<A NAME="tex2html747"
  HREF="node30.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
 SRC="file:/usr/share/latex2html/icons/next.png"></A> 
<A NAME="tex2html741"
  HREF="node25.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
 SRC="file:/usr/share/latex2html/icons/up.png"></A> 
<A NAME="tex2html737"
  HREF="node28.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
 SRC="file:/usr/share/latex2html/icons/prev.png"></A> 
<A NAME="tex2html743"
  HREF="node2.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
 SRC="file:/usr/share/latex2html/icons/contents.png"></A> 
<A NAME="tex2html745"
  HREF="node85.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index"
 SRC="file:/usr/share/latex2html/icons/index.png"></A> 
<BR>
<B> Next:</B> <A NAME="tex2html748"
  HREF="node30.html">3.3 Defining and Exporting</A>
<B> Up:</B> <A NAME="tex2html742"
  HREF="node25.html">3.2 The SCRAM Build</A>
<B> Previous:</B> <A NAME="tex2html738"
  HREF="node28.html">3.2.1.0.2 ProductStore Example:</A>
 &nbsp <B>  <A NAME="tex2html744"
  HREF="node2.html">Contents</A></B> 
 &nbsp <B>  <A NAME="tex2html746"
  HREF="node85.html">Index</A></B> 
<BR>
<BR>
<!--End of Navigation Panel-->

<H2><A NAME="SECTION00422000000000000000"></A><A NAME="sec:compilersupport"></A><A NAME="820"></A>
<A NAME="821"></A>
<BR>
3.2.2 Compiler Support
</H2>
The project <TT>BuildFile</TT> also specifies which compilers are
to be used. There are two options: either a default compiler can be
chosen using an &lt;<TT>external</TT>&gt;  tag in the relevant architecture 
block, or, alternatively, multiple compilers can be set up and the user can
switch between them before build operations.
By supporting multiple compilers for the same
architecture, coding practices can be tested more thoroughly.
<A NAME="824"></A>
<A NAME="825"></A>
The first option is achieved using
&lt;<TT>architecture</TT>...&gt; tags like this-

<P>
<PRE> 
&lt;Architecture name=Linux__2.2&gt; 
&lt;External ref=gcc&gt; 
CCcompiler:=gcc 
&lt;/Architecture&gt;
</PRE>
<P>
In this case <TT>gcc</TT> will be the compiler used on a
platform that has a <SMALL>SCRAM</SMALL>&nbsp;architecture of
<TT>Linux__2.2</TT>. Note that the <I>version</I> of the
compiler is set by the configuration used by the project: the
configuration version is specified in the <TT>requirementsdoc</TT>.
The second option, using several compilers on one architecture,
involves the following steps:

<OL>
<LI>Ensure that all compilers that are required have been added to
  the configuration in the appropriate architecture block, 
  and have been selected in the project <TT>RequirementsDoc</TT>.
</LI>
<LI>Any &lt;<TT>external</TT>&gt;  tags in architecture blocks must be removed.
</LI>
<LI>Each compiler must be set up appropriately on the current system.
</LI>
<LI>A compiler is selected for use before building using the command
  <TT>scram switch</TT>

&nbsp;<I>statements</I>
  </LI>
</OL>
where the statements are typical makefile variable settings like
<I>compiler_name</I>=<TT>true</TT>. Any valid statement can be
passed directly to the build system and will be permanent until a
subsequent <TT>scram b very_clean</TT> removes the makefile
stub that contains the statements. Any changes resulting from use of
this command will override matching settings in the project <TT>BuildFile</TT>.

<P>
<HR>
<!--Navigation Panel-->
<A NAME="tex2html747"
  HREF="node30.html">
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
 SRC="file:/usr/share/latex2html/icons/next.png"></A> 
<A NAME="tex2html741"
  HREF="node25.html">
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
 SRC="file:/usr/share/latex2html/icons/up.png"></A> 
<A NAME="tex2html737"
  HREF="node28.html">
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
 SRC="file:/usr/share/latex2html/icons/prev.png"></A> 
<A NAME="tex2html743"
  HREF="node2.html">
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
 SRC="file:/usr/share/latex2html/icons/contents.png"></A> 
<A NAME="tex2html745"
  HREF="node85.html">
<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index"
 SRC="file:/usr/share/latex2html/icons/index.png"></A> 
<BR>
<B> Next:</B> <A NAME="tex2html748"
  HREF="node30.html">3.3 Defining and Exporting</A>
<B> Up:</B> <A NAME="tex2html742"
  HREF="node25.html">3.2 The SCRAM Build</A>
<B> Previous:</B> <A NAME="tex2html738"
  HREF="node28.html">3.2.1.0.2 ProductStore Example:</A>
 &nbsp <B>  <A NAME="tex2html744"
  HREF="node2.html">Contents</A></B> 
 &nbsp <B>  <A NAME="tex2html746"
  HREF="node85.html">Index</A></B> 
<!--End of Navigation Panel-->
<ADDRESS>
scram-developers@cern.ch
</ADDRESS>
</BODY>
</HTML>
Revision:	1.1
Committed:	Mon Nov 18 17:50:01 2002 UTC (22 years, 5 months ago) by sashby
Content type:	text/html
Branch:	MAIN
CVS Tags:	V1_pre0, V0_19_7
Branch point for:	SCRAM_V1_BRANCH
Log Message:	Generated and added HTML documentation.
#	User	Rev	Content
1	sashby	1.1	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
2
3			<!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4
4			patched version by: Kenshi Muto, Debian Project.
5			LaTeX2HTML 2002 (1.62),
6			original version by: Nikos Drakos, CBLU, University of Leeds
7			* revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan
8			* with significant contributions from:
9			Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
10			<HTML>
11			<HEAD>
12			<TITLE>3.2.2 Compiler Support</TITLE>
13			<META NAME="description" CONTENT="3.2.2 Compiler Support">
14			<META NAME="keywords" CONTENT="SCRAM">
15			<META NAME="resource-type" CONTENT="document">
16			<META NAME="distribution" CONTENT="global">
17
18			<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
19			<META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4">
20			<META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css">
21
22			<LINK REL="STYLESHEET" HREF="SCRAM.css">
23
24			<LINK REL="previous" HREF="node26.html">
25			<LINK REL="up" HREF="node25.html">
26			<LINK REL="next" HREF="node30.html">
27			</HEAD>
28
29			<BODY bgcolor="beige" >
30			<!--Navigation Panel-->
31			<A NAME="tex2html747"
32			HREF="node30.html">
33			<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
34			SRC="file:/usr/share/latex2html/icons/next.png"></A>
35			<A NAME="tex2html741"
36			HREF="node25.html">
37			<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
38			SRC="file:/usr/share/latex2html/icons/up.png"></A>
39			<A NAME="tex2html737"
40			HREF="node28.html">
41			<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
42			SRC="file:/usr/share/latex2html/icons/prev.png"></A>
43			<A NAME="tex2html743"
44			HREF="node2.html">
45			<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
46			SRC="file:/usr/share/latex2html/icons/contents.png"></A>
47			<A NAME="tex2html745"
48			HREF="node85.html">
49			<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index"
50			SRC="file:/usr/share/latex2html/icons/index.png"></A>
51			<BR>
52			<B> Next:</B> <A NAME="tex2html748"
53			HREF="node30.html">3.3 Defining and Exporting</A>
54			<B> Up:</B> <A NAME="tex2html742"
55			HREF="node25.html">3.2 The SCRAM Build</A>
56			<B> Previous:</B> <A NAME="tex2html738"
57			HREF="node28.html">3.2.1.0.2 ProductStore Example:</A>
58			&nbsp <B> <A NAME="tex2html744"
59			HREF="node2.html">Contents</A></B>
60			&nbsp <B> <A NAME="tex2html746"
61			HREF="node85.html">Index</A></B>
62			<BR>
63			<BR>
64			<!--End of Navigation Panel-->
65
66			<H2><A NAME="SECTION00422000000000000000"></A><A NAME="sec:compilersupport"></A><A NAME="820"></A>
67			<A NAME="821"></A>
68			<BR>
69			3.2.2 Compiler Support
70			</H2>
71			The project <TT>BuildFile</TT> also specifies which compilers are
72			to be used. There are two options: either a default compiler can be
73			chosen using an <<TT>external</TT>> tag in the relevant architecture
74			block, or, alternatively, multiple compilers can be set up and the user can
75			switch between them before build operations.
76			By supporting multiple compilers for the same
77			architecture, coding practices can be tested more thoroughly.
78			<A NAME="824"></A>
79			<A NAME="825"></A>
80			The first option is achieved using
81			<<TT>architecture</TT>...> tags like this-
82
83			<P>
84			<PRE>
85			<Architecture name=Linux__2.2>
86			<External ref=gcc>
87			CCcompiler:=gcc
88			</Architecture>
89			</PRE>
90			<P>
91			In this case <TT>gcc</TT> will be the compiler used on a
92			platform that has a <SMALL>SCRAM</SMALL> architecture of
93			<TT>Linux__2.2</TT>. Note that the <I>version</I> of the
94			compiler is set by the configuration used by the project: the
95			configuration version is specified in the <TT>requirementsdoc</TT>.
96			The second option, using several compilers on one architecture,
97			involves the following steps:
98
99			<OL>
100			<LI>Ensure that all compilers that are required have been added to
101			the configuration in the appropriate architecture block,
102			and have been selected in the project <TT>RequirementsDoc</TT>.
103			</LI>
104			<LI>Any <<TT>external</TT>> tags in architecture blocks must be removed.
105			</LI>
106			<LI>Each compiler must be set up appropriately on the current system.
107			</LI>
108			<LI>A compiler is selected for use before building using the command
109			<TT>scram switch</TT>
110
111			<I>statements</I>
112			</LI>
113			</OL>
114			where the statements are typical makefile variable settings like
115			<I>compiler_name</I>=<TT>true</TT>. Any valid statement can be
116			passed directly to the build system and will be permanent until a
117			subsequent <TT>scram b very_clean</TT> removes the makefile
118			stub that contains the statements. Any changes resulting from use of
119			this command will override matching settings in the project <TT>BuildFile</TT>.
120
121			<P>
122			<HR>
123			<!--Navigation Panel-->
124			<A NAME="tex2html747"
125			HREF="node30.html">
126			<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next"
127			SRC="file:/usr/share/latex2html/icons/next.png"></A>
128			<A NAME="tex2html741"
129			HREF="node25.html">
130			<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up"
131			SRC="file:/usr/share/latex2html/icons/up.png"></A>
132			<A NAME="tex2html737"
133			HREF="node28.html">
134			<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous"
135			SRC="file:/usr/share/latex2html/icons/prev.png"></A>
136			<A NAME="tex2html743"
137			HREF="node2.html">
138			<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents"
139			SRC="file:/usr/share/latex2html/icons/contents.png"></A>
140			<A NAME="tex2html745"
141			HREF="node85.html">
142			<IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index"
143			SRC="file:/usr/share/latex2html/icons/index.png"></A>
144			<BR>
145			<B> Next:</B> <A NAME="tex2html748"
146			HREF="node30.html">3.3 Defining and Exporting</A>
147			<B> Up:</B> <A NAME="tex2html742"
148			HREF="node25.html">3.2 The SCRAM Build</A>
149			<B> Previous:</B> <A NAME="tex2html738"
150			HREF="node28.html">3.2.1.0.2 ProductStore Example:</A>
151			&nbsp <B> <A NAME="tex2html744"
152			HREF="node2.html">Contents</A></B>
153			&nbsp <B> <A NAME="tex2html746"
154			HREF="node85.html">Index</A></B>
155			<!--End of Navigation Panel-->
156			<ADDRESS>
157			scram-developers@cern.ch
158			</ADDRESS>
159			</BODY>
160			</HTML>