PR26107, Compilation failure in pdp11.c

[Stephen Casner]

On Thu, 11 Jun 2020, Alan Modra via Binutils wrote:

> 	PR 26107
> 	* pdp11.c (is_stab): Replace legacy "index" function with "strchr".

Alan,

Thanks for fixing this for me, I didn't see it earlier.  Again this
problem was not exposed when I built the pdp11-aout target with clang.
(I also am surprised that building bfd/vax1knetbsd.c hits an error in
bfd/pdp11.c, but nevermind.)

After the earlier bug that Nick found I tried to build gcc-9 but hit
the compilation error shown below that I had not solved yet.  If this
happens to be something you've seen before, any hints you can provide
would be appreciated.

I assume that both the warnings about the 'unavailable' attribute and
the errors for undefined items are caused by the inclusion of
/opt/local/include/unwind.h rather than ./include/unwind.h -- why
doesn't the compile command include -I./include or something
equivalent?  I would expect that to be first choice.

                                                        -- Steve

Configure:

/Users/casner/src/gnu/gcc-9/configure --prefix=/usr/local/gcc-9 --enable-checking=release --disable-multilib --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk --program-suffix=-9 --disable-libgfortran --disable-libobjc --with-gmp=/opt/local/ --with-mpfr=/opt/local/ --with-mpc=/opt/local/ --with-libiconv-prefix=/opt/local --enable-languages=c,c++

Compilation errors:

libtool: compile:  /Users/casner/src/gnu/gcc-9/build/./gcc/xgcc -shared-libgcc -B/Users/casner/src/gnu/gcc-9/build/./gcc -nostdinc++ -L/Users/casner/src/gnu/gcc-9/build/x86_64-apple-darwin18.7.0/libstdc++-v3/src -L/Users/casner/src/gnu/gcc-9/build/x86_64-apple-darwin18.7.0/libstdc++-v3/src/.libs -L/Users/casner/src/gnu/gcc-9/build/x86_64-apple-darwin18.7.0/libstdc++-v3/libsupc++/.libs -B/usr/local/gcc-9/x86_64-apple-darwin18.7.0/bin/ -B/usr/local/gcc-9/x86_64-apple-darwin18.7.0/lib/ -isystem /usr/local/gcc-9/x86_64-apple-darwin18.7.0/include -isystem /usr/local/gcc-9/x86_64-apple-darwin18.7.0/sys-include -fno-checking -I/Users/casner/src/gnu/gcc-9/libstdc++-v3/../libgcc -I/Users/casner/src/gnu/gcc-9/build/x86_64-apple-darwin18.7.0/libstdc++-v3/include/x86_64-apple-darwin18.7.0 -I/Users/casner/src/gnu/gcc-9/build/x86_64-apple-darwin18.7.0/libstdc++-v3/include -I/Users/casner/src/gnu/gcc-9/libstdc++-v3/libsupc++ -I/opt/local/include -I/opt/local/include -D_GLIBCXX_SHARED -fno-!
 implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=eh_alloc.lo -g -O2 -c /Users/casner/src/gnu/gcc-9/libstdc++-v3/libsupc++/eh_alloc.cc  -fno-common -DPIC -D_GLIBCXX_SHARED -o eh_alloc.o
In file included from /Users/casner/src/gnu/gcc-9/libstdc++-v3/libsupc++/unwind-cxx.h:36,
                 from /Users/casner/src/gnu/gcc-9/libstdc++-v3/libsupc++/eh_alloc.cc:35:
/opt/local/include/unwind.h:23:57: warning: ‘unavailable’ attribute directive ignored [-Wattributes]
   23 | #define LIBUNWIND_UNAVAIL __attribute__ (( unavailable ))
      |                                                         ^
/opt/local/include/unwind.h:351:5: note: in expansion of macro ‘LIBUNWIND_UNAVAIL’
  351 |     LIBUNWIND_UNAVAIL;
      |     ^~~~~~~~~~~~~~~~~

[snip multiple instances of the warning]


In file included from /Users/casner/src/gnu/gcc-9/libstdc++-v3/libsupc++/eh_alloc.cc:35:
/Users/casner/src/gnu/gcc-9/libstdc++-v3/libsupc++/unwind-cxx.h:92:3: error: ‘_Unwind_Ptr’ does not name a type; did you mean ‘_Unwind_SetIP’?
   92 |   _Unwind_Ptr catchTemp;
      |   ^~~~~~~~~~~
      |   _Unwind_SetIP
/Users/casner/src/gnu/gcc-9/libstdc++-v3/libsupc++/unwind-cxx.h:146:3: error: ‘_Unwind_Ptr’ does not name a type; did you mean ‘_Unwind_SetIP’?
  146 |   _Unwind_Ptr catchTemp;
      |   ^~~~~~~~~~~
      |   _Unwind_SetIP
/Users/casner/src/gnu/gcc-9/libstdc++-v3/libsupc++/unwind-cxx.h:320:7: error: ‘_Unwind_Exception_Class’ does not name a type; did you mean ‘_Unwind_Exception’?
  320 | const _Unwind_Exception_Class __gxx_primary_exception_class
      |       ^~~~~~~~~~~~~~~~~~~~~~~
      |       _Unwind_Exception

[snip more similar errors]