[Bug d/88431] link errors on build
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88431 Iain Buclaw changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED --- Comment #5 from Iain Buclaw --- Fixed in r270531.
[Bug d/88431] link errors on build
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88431 --- Comment #4 from ibuclaw at gcc dot gnu.org --- Author: ibuclaw Date: Wed Apr 24 02:04:04 2019 New Revision: 270531 URL: https://gcc.gnu.org/viewcvs?rev=270531=gcc=rev Log: libphobos: Fix link build errors when compiling with unsupported options The first compilation test to get baseline warnings was getting more messages due to a missing object.d file, compared to later configure tests where libphobos is in the include paths. Because there must always be an object module during compilation, let the tests themselves be an empty object module instead. libphobos/ChangeLog: 2019-04-24 Iain Buclaw PR d/88431 * configure: Regenerate. * m4/libtool.m4 (lt_simple_compile_test_code): Update to not have dependencies on libphobos. (lt_simple_link_test_code): Likewise. (GDCFLAGS): Don't override for D compiler tests. Modified: trunk/libphobos/ChangeLog trunk/libphobos/configure trunk/libphobos/m4/libtool.m4
[Bug d/88431] link errors on build
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88431
--- Comment #3 from Iain Buclaw ---
Added some debug prints in the boilerplate check.
configure:12017: Checking compiler boilerplate from: $CC -o conftest$ac_exeext
$CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5
configure:12018: module mod; extern(C) int main() { return 0; }
configure:12019: Boilerplate = d21: warning: command line option '-Wlogical-op'
is valid for C/C++/ObjC/ObjC++ but not for D
d21: error: cannot find source code for runtime library file 'object.d'
d21: note: dmd might not be correctly installed. Run 'dmd -man' for
installation instructions.
d21: note: config file: not found
import path[0] = /usr/include/d
So the D boilerplate in the initial test does not match the warnings in latter
tests.
This is the problem here.
[Bug d/88431] link errors on build
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88431
--- Comment #2 from Iain Buclaw ---
(In reply to David Binderman from comment #1)
> This config line works fine:
>
> ../trunk/configure --prefix=/home/dcb/gcc/results.266950 \
> --disable-multilib \
> --disable-werror \
> --enable-checking=df,extra,fold,rtl,yes \
> --enable-languages=d
>
> so it looks like using -O3 in the top level Makefile causes trouble.
I see the following in the config.cache for libphobos:
lt_cv_prog_compiler_pic_works=${lt_cv_prog_compiler_pic_works=yes}
lt_cv_prog_compiler_pic_works_D=${lt_cv_prog_compiler_pic_works_D=no}
config.log:
configure:12414: checking if ./gcc/gdc -B./gcc/ PIC flag -fPIC works
configure:12432: ./gcc/gdc -B./gcc/ -c -nophoboslib -fno-moduleinfo -nostdinc
-g -O3 -march=native -Wlogical-op -fPIC conftest.d >&5
d21: warning: command line option '-Wlogical-op' is valid for C/C++/ObjC/ObjC++
but not for D
configure:12436: $? = 0
configure:12449: result: no
It looks like -Wlogical-op is the culprit, not -O3.
This is the condition in configure:
---
if (exit $ac_status) && test -s "$ac_outfile"; then
# The compiler can only warn and ignore the option if not recognized
# So say no if there are warnings other than the usual output.
$ECHO "$_lt_compiler_boilerplate" | $SED '/^$/d' >conftest.exp
$SED '/^$/d; /^ *+/d' conftest.err >conftest.er2
if test ! -s conftest.er2 || diff conftest.exp conftest.er2 >/dev/null; then
lt_cv_prog_compiler_pic_works_D=yes
fi
fi
[Bug d/88431] link errors on build
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88431 --- Comment #1 from David Binderman --- This config line works fine: ../trunk/configure --prefix=/home/dcb/gcc/results.266950 \ --disable-multilib \ --disable-werror \ --enable-checking=df,extra,fold,rtl,yes \ --enable-languages=d so it looks like using -O3 in the top level Makefile causes trouble.
