From mboxrd@z Thu Jan  1 00:00:00 1970
MIME-Version: 1.0
From: Kyohei Kadota <lufia@lufia.org>
Date: Fri,  3 Aug 2018 23:35:21 +0900
Message-ID: <CAFMepc=tjm3V4VPYzsAWTaHGRcSi3b0C5Z44W8J9oFbhrX5apw@mail.gmail.com>
To: 9fans@9fans.net
Content-Type: multipart/alternative; boundary="0000000000001325ea057288d7ae"
Subject: [9fans] question about #include_next directive
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Hi, fans.

I'm trying to port LibreSSL on native Plan 9.
Some functions are works now:

    1. git clone https://github.com/lufia/portable && cd portable
    2. rc ./update.rc
    3. ape/patch -p0 <plan9/crypto.patch
    4. ape/patch -p0 <plan9/ssl.patch
    5. ape/patch -p0 <plan9/apps.patch
    6. for(i in crypto ssl apps/openssl) @{ cd $i; mk }

I have difficulty in porting header files.
Some headers of LibreSSL has #include_next GCC extended directive, but Plan
9's cpp can't process #include_next directive.
When cpp processes a header containing #include_next, it exits with
"Unknown preprocessor control #include_next" error even if ignoring by #if
and #endif.

    % cat <<! | cpp
    #if 0
    #include_next <u.h>
    #endif
    !
    #line 1 "/usr/lufia/<stdin>"
    cpp: <stdin>:2 Unknown preprocessor control include_next

I had no choice but to rewrite #include_next like:

compat.h:
    #ifdef Plan9
    #define SYS_PATH(x) /sys/include/ape/x
    #else
    #define SYS_PATH(x) sys_##x
    #endif
    #define SYSINCLUDE(x) <SYS_PATH(x)>

string.h:
    #include SYSINCLUDE(string.h)

sys_string.h:
    #include_next <string.h>

This works but I think this way is not good because developer should manage
two files.
Is there any good way?

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<div dir=3D"ltr"><div>Hi, fans.</div><div><br></div><div>I&#39;m trying to =
port LibreSSL on native Plan 9.</div><div>Some functions are works now:</di=
v><div><br></div><div>=C2=A0 =C2=A0 1. git clone <a href=3D"https://github.=
com/lufia/portable">https://github.com/lufia/portable</a> &amp;&amp; cd por=
table</div><div>=C2=A0 =C2=A0 2. rc ./update.rc</div><div>=C2=A0 =C2=A0 3. =
ape/patch -p0 &lt;plan9/crypto.patch</div><div>=C2=A0 =C2=A0 4. ape/patch -=
p0 &lt;plan9/ssl.patch</div><div>=C2=A0 =C2=A0 5. ape/patch -p0 &lt;plan9/a=
pps.patch</div><div>=C2=A0 =C2=A0 6. for(i in crypto ssl apps/openssl) @{ c=
d $i; mk }</div><div><br></div><div>I have difficulty in porting header fil=
es.</div><div>Some headers of LibreSSL has #include_next GCC extended direc=
tive, but Plan 9&#39;s cpp can&#39;t process #include_next directive.</div>=
<div>When cpp processes a header containing #include_next, it exits with &q=
uot;Unknown preprocessor control #include_next&quot; error even if ignoring=
 by #if and #endif.</div><div><br></div><div>=C2=A0 =C2=A0 % cat &lt;&lt;! =
| cpp</div><div>=C2=A0 =C2=A0 #if 0</div><div>=C2=A0 =C2=A0 #include_next &=
lt;u.h&gt;</div><div>=C2=A0 =C2=A0 #endif</div><div>=C2=A0 =C2=A0 !</div><d=
iv><div>=C2=A0 =C2=A0 #line 1 &quot;/usr/lufia/&lt;stdin&gt;&quot;</div><di=
v>=C2=A0 =C2=A0 cpp: &lt;stdin&gt;:2 Unknown preprocessor control include_n=
ext</div></div><div><br></div><div>I had no choice but to rewrite #include_=
next like:</div><div><br></div><div>compat.h:</div><div>=C2=A0 =C2=A0 #ifde=
f Plan9</div><div>=C2=A0 =C2=A0 #define SYS_PATH(x) /sys/include/ape/x</div=
><div>=C2=A0 =C2=A0 #else</div><div>=C2=A0 =C2=A0 #define SYS_PATH(x) sys_#=
#x</div><div>=C2=A0 =C2=A0 #endif</div><div>=C2=A0 =C2=A0 #define SYSINCLUD=
E(x) &lt;SYS_PATH(x)&gt;</div><div><br></div><div>string.h:</div><div>=C2=
=A0 =C2=A0 #include SYSINCLUDE(string.h)</div><div><br></div><div>sys_strin=
g.h:</div><div>=C2=A0 =C2=A0 #include_next &lt;string.h&gt;</div><div><br><=
/div><div>This works but I think this way is not good because developer sho=
uld manage two files.</div><div>Is there any good way?</div></div>

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