Re: ICE building a libsupc++ file, pdp11 target

[Paul Koning <paulkoning at comcast dot net>]

> On Jul 13, 2018, at 2:52 PM, U.Mutlu <um@mutluit.com> wrote:
> 
> Paul Koning wrote on 07/13/2018 08:27 PM:
>> I'm trying to see if I can build the pdp11 target for languages other than just C, and the answer is for the most part yes.  But I' running into an ICE I can't figure out.  It's way before the back end comes into the picture as far as I can see, and there's nothing particularly strange looking in the input file that suggests anything.
>> 
>> Any suggestions on where to look?  The failure is:
>> 
>> libtool: compile:  /Users/pkoning/Documents/svn/buildpdp+/./gcc/xgcc -shared-libgcc -B/Users/pkoning/Documents/svn/buildpdp+/./gcc -nostdinc++ -L/Users/pkoning/Documents/svn/buildpdp+/pdp11-aout/libstdc++-v3/src -L/Users/pkoning/Documents/svn/buildpdp+/pdp11-aout/libstdc++-v3/src/.libs -L/Users/pkoning/Documents/svn/buildpdp+/pdp11-aout/libstdc++-v3/libsupc++/.libs -B/usr/local/pdp11-aout/pdp11-aout/bin/ -B/usr/local/pdp11-aout/pdp11-aout/lib/ -isystem /usr/local/pdp11-aout/pdp11-aout/include -isystem /usr/local/pdp11-aout/pdp11-aout/sys-include -I/Users/pkoning/Documents/svn/gcc/libstdc++-v3/../libgcc -I/Users/pkoning/Documents/svn/buildpdp+/pdp11-aout/libstdc++-v3/include/pdp11-aout -I/Users/pkoning/Documents/svn/buildpdp+/pdp11-aout/libstdc++-v3/include -I/Users/pkoning/Documents/svn/gcc/libstdc++-v3/libsupc++ -fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi -fdiagnostics-show-location=once -frandom-seed=new_opa.lo -g -O2 -std=gnu++1z -c ../../../../gcc/lib
> stdc++-v3/libsupc++/new_opa.cc -o new_opa.o
>> cc1plus: warning: -Wabi won't warn about anything [-Wabi]
>> cc1plus: note: -Wabi warns about differences from the most up-to-date ABI, which is also used by default
>> cc1plus: note: use e.g. -Wabi=11 to warn about changes from GCC 7
>> ../../../../gcc/libstdc++-v3/libsupc++/new_opa.cc:112:1: internal compiler error: in import_export_decl, at cp/decl2.c:2877
>>  }
>>  ^
>> libbacktrace could not find executable to open
>> Please submit a full bug report,
>> with preprocessed source if appropriate.
>> See <https://gcc.gnu.org/bugs/> for instructions.
>> make[3]: *** [new_opa.lo] Error 1
> 
> 
> It's failing at the last gcc_assert() below (file ../gcc_src/gcc/cp/decl2.c:2877 ):

Sorry, I should have been more explicit.  I saw that, but my question is: what is the underlying problem that triggers the assert?  The comment is not much help to me.  And more specifically: what could a target be doing wrong that would make an early stage of the compiler fail like this on what seems like a pretty straightforward source file?

Many of the other libstdc++ bits compile just fine, as do plenty of testsuite cases and some test files of my own.

	paul