Re: Problem with GCC in-tree plugin build (autoconf, libtool).

["U.Mutlu" <um at mutluit dot com>]

Oleg Ogurtsov wrote on 07/12/2018 03:47 PM:
> Hello.
>
> I try to build a plug-in written in C++ inside GCC tree, but the build is
> interrupted with an error:
>
> 'libtool:   error: unrecognised option: '-DHAVE_CONFIG_H''.
>
> The launch string begins with
> '/bin/sh ../libtool --tag=CXX --mode=compile -DHAVE_CONFIG_H -I.'.
> Apparently libtool doesn't add compiler name to line (xg++).
>
> The libtool file has a line with language specific compiler for CXX has xgcc,
> instead of xg++:
>
> 'CC="/home/abuild/rpmbuild/BUILD/gcc-6.2.1/obj/./gcc/xgcc -shared-libgcc -B/home/abuild/rpmbuild/BUILD/gcc-6.2.1/obj/./gcc -nostdinc++
> -L/home/abuild/rpmbuild/BUILD/gcc-6.2.1/obj/x86_64-tizen-linux-gnu/libstdc++-v3/src
> -L/home/abuild/rpmbuild/BUILD/gcc-6.2.1/obj/x86_64-tizen-linux-gnu/libstdc++-v3/src/.libs -L/home/abuild/rpmbuild/BUILD/gcc-6.2.1/obj/x86_64-tizen-linux-gnu/libstdc++-v3/libsupc++/.libs -B/usr/x86_64-tizen-linux-gnu/bin/ -B/usr/x86_64-tizen-linux-gnu/lib/ -isystem /usr/x86_64-tizen-linux-gnu/include -isystem /usr/x86_64-tizen-linux-gnu/sys-include   "'
>
> The configure.ac has AC_PROG_CXX, and building the plugin separately is successful.
> Can anybody tell what am I missing?

Is your plugin placed under the gcc source tree?
See ../gcc_src/lto-plugin for inspirations.

Yours is written in C++, the lto-plugin is written in C.
So, there could be a bug in the configure script of your plugin
as your observation (xgcc vs. xg++) indicates.
Ie. check your autoconf/automake scripts (configure.ac, Makefile.am)
that creates the configure script.

Try also this in the plugin src dir:

aclocal
autoheader
automake
automake --add-missing
autoconf


Check also the errors ($ grep "error: " config.log) generated by the plugin 
configure script.

The main configure and make should be fired from inside the same build script
(otherwise differences in the evironment can happen).