sysroot and json.h

[Colin Ian King]

On 31/03/15 22:33, Jeffrey Bastian wrote:
> In January, commit 690de7ffb96c changed the Makefile.am files to use gcc
> sysroot support for the json headers and libraries:
>     http://kernel.ubuntu.com/git?p=hwe/fwts.git;a=commit;h=690de7ffb96c
> 
> This is breaking the build process on Fedora 21:
> =======================================================================
> libtool: compile:  gcc -DHAVE_CONFIG_H .... -I=/usr/include/json -I=/usr/include/json-c .... -c fwts_ac_adapter.c -fPIC -DPIC -o .libs/libfwts_la-fwts_ac_adapter.o
> In file included from ../../../src/lib/include/fwts.h:84:0,
>                  from fwts_ac_adapter.c:19:
> ../../../src/lib/include/fwts_json.h:23:18: fatal error: json.h: No such file or directory
>  #include <json.h>
>                   ^
> compilation terminated.
> =======================================================================
> 
> The json.h file is in /usr/include/json-c/json.h where it's supposed to
> be, it's just that the -I= flag isn't working without --sysroot too.
> 
> I can manually compile this file if I re-run the above command and add a
> "--sysroot=/" flag, so I tried doing
>     ./configure --with-sysroot=/
>     make
> but the "--with-sysroot" flag to configure does not add a "--sysroot"
> flag to the gcc command line so that didn't work.
> 
> Then I tried
>     CFLAGS=--sysroot=/ ./configure
> but that failed in the configure script.

I suggest trying:

	CFLAGS=--sysroot= ./configure

I don't have access to a Fedora 21 installation at hand, so I can't test
this out to see if it works.

> 
> So for now I have to revert this patch to get it to compile.
> 
> Can the -I= for json.h only be used if you also have --sysroot defined?
> That is, it should be either
>     --sysroot=/some/path -I=/usr/include/json -I=/usr/include/json-c
> (exclusive-)or
>     -I/usr/include/json -I/usr/include/json-c
> 
> Thank you,
> Jeff Bastian
>