CCVER: Add /usr/pkgsrc/lang/gcc-aux as 'gcc47'
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b0eef83f 32.Dd July 9, 2012
c97b9141 33.Dt COMPILERS.CONF 5
fb5b3747 34.Os
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35.Sh NAME
36.Nm compilers.conf
37.Nd configuration file for external compilers
38.Sh SYNOPSIS
39.Pa /etc/compilers.conf
40.Sh DESCRIPTION
41The
42.Nm
43file allows to configure
44.Dq external
45compilers for usage with the
46.Dx
47.Xr build 7
48system.
49.Pp
50The
51.Pa /etc/defaults/compilers.conf
52file specifies the default settings for all variables, the
53.Pa /etc/compilers.conf
54file specifies override settings.
55.Pp
56The following variables are available:
57.Bl -tag -width ".Va <version>_CPPFLAGS"
58.It Va <version>_CC
59The pathname of the
60.Nm cc
61program of the compiler.
62.It Va <version>_CFLAGS
63Any additional flags to pass to
64.Va <version>_CC .
65.It Va <version>_CPP
66The pathname of the
67.Nm cpp
68program of the compiler.
69.It Va <version>_CPPFLAGS
70Any additional flags to pass to
71.Va <version>_CPP .
72.It Va <version>_CXX
73The pathname of the
74.Nm c++
75program of the compiler.
76.It Va <version>_CXXFLAGS
77Any additional flags to pass to
78.Va <version>_CXX .
79.It Va <version>_VERSION
80What to output when the
81.Fl dumpversion
82option is used.
83This helps
84.Nm clang
85with
86.Xr pkgsrc 7 .
87.El
88.Pp
89Once configured the compiler can then be used like this:
90.Bd -literal -offset indent
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91env CCVER=clang make
92.Ed
93.Pp
94To build world and kernel, use the following instructions:
95.Bd -literal -offset indent
c97b9141 96cd /usr/src
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97fetch http://leaf.dragonflybsd.org/~swildner/world_clang.diff
98patch -p1 <world_clang.diff
99env WORLD_CCVER=clang make -DNO_GCC44 buildworld
100env WORLD_CCVER=clang make buildkernel KERNCONF=MYCONF
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101.Ed
102.Pp
cfe16058 103Currently, defaults are provided for
c97b9141 104.Nm clang
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105(installed from
106.Xr pkgsrc 7 Ap s
6673f254 107.Pa lang/clang ) ,
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108.Nm clangsvn
109(installed from SVN trunk as described in
6673f254 110.Pa http://clang.llvm.org/get_started.html ) ,
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111.Nm gcc46
112(installed from
113.Xr pkgsrc 7 Ap s
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114.Pa lang/gnat-aux ) ,
115.Nm gcc47
116(installed from
117.Xr pkgsrc 7 Ap s
118.Pa lang/gcc-aux )
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119and
120.Nm pcc
121(installed from
122.Xr pkgsrc 7 Ap s
123.Pa lang/pcc-current ) .
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124.Sh IMPLEMENTATION NOTES
125In
126.Dx ,
127compilers are selected by setting the
128.Ev CCVER
129variable.
130The
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131.Pa cpp ,
132.Pa cc
133etc\&. programs in
134.Pa /usr/bin
135are actually links to the
1237441a 136.Xr objformat 1
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137deflector program which is responsible for executing the
138correct programs (located in
139.Pa /usr/libexec/$CCVER ) .
140.Pp
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141Traditionally,
142.Dx
143has 2 compilers in base, one of which is the default compiler and the other
144is either a newer or older version.
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145In order to allow additional non-base compilers into
146.Dx Ap s
147build process,
148.Xr objformat 1
149deflects to
150.Pa /usr/libexec/custom
151when
152.Ev CCVER Ap s
153setting is not one of the compilers in base.
154This directory contains a
155.Pa cc
156wrapper script (and some links to it).
157The wrapper script then takes care of making the compiler look and behave
158like a compiler in base.
159.Pp
160The settings in
161.Nm
162specify paths and flags for the
163.Pa /usr/libexec/custom/cc
164script.
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165.Sh FILES
166.Bl -tag -width ".Pa /etc/compilers.conf" -compact
167.It Pa /etc/compilers.conf
168external compiler configuration file
169.El
170.Sh SEE ALSO
171.Xr objformat 1 ,
172.Xr build 7
173.Sh HISTORY
174The
175.Nm
176file first appeared in
177.Dx 2.3 .