Re: Can not work with libguile-2.0

[Mark Harig]

> I run the mannal cmd and also have something wrong:
> ---->cut here<----
> $ gcc -shared -o libguile-bessel.so -fPIC t1.c
> t1.c:2:22: error: libguile.h: No such file or directory
> t1.c:5: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ 
before
> ‘j0_wrapper’
> t1.c: In function ‘init_bessel’:
> t1.c:13: error: ‘j0_wrapper’ undeclared (first use in this function)
> t1.c:13: error: (Each undeclared identifier is reported only once
> t1.c:13: error: for each function it appears in.)
> ---->cut here<----
> But when I run cmd:
> gcc -shared -o libguile-bessel.so -fPIC t1.c `pkg-config --cflags 
--libs
> guile-2.0`
> everything is OK!

Agreed.  The command listed in section 2.4 "Writing Guile Extensions"
should follow the pattern used in section 2.3 "Linking Guile into
Programs," namely, add the 'pkg-config' command to provide the
appropriate command-line options for the preprocessor, compiler, and
linker.  In addition, the manual should mention that the environment
variable 'PKG_CONFIG_PATH' needs to be set before invoking the
compiler.  Something like the following needs to be added, along with
some explanatory text:

 $ export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH
  $ gcc -shared -o libguile-bessel.so -fPIC t1.c `pkg-config --cflags 
--libs guile-2.0`

The manual should provide this extra detail so that new users can
simply follow the steps listed without having to refer to external
documents.

--