https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90133
Bug ID: 90133
Summary: Linker error if no
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: damian at sourceryinstitute dot org
Target Milestone: ---
The code below compiles cleanly with -fcoarray=single but generates a linker
error when I use -fcoarray=lib and link to MPICH and OpenCoarrays. The linking
problem goes away if the "use" statement and "type(event_type)" declaration are
moved to just after the "associate" statement and wrapped in "block/end block",
which leads me to suspect this might be a gfortran bug rather than an
OpenCoarrays bug.
$ cat link-error.f90
module link_error
contains
subroutine post_event_in_associate
use iso_fortran_env
type(event_type), save :: e[*]
associate( i => 1 )
event post(e[1])
end associate
end
end module
end
$ gfortran \
-I/home/rouson/Desktop/Builds/opt/opencoarrays/2.6.1-b480f1d/gnu/9.0.1/include/OpenCoarrays-2.6.1-14-gb480f1d_GNU-9.0.1
\
-fcoarray=lib \
-Wl,-rpath \
-Wl,/home/rouson/Builds/opt/mpich/3.2/gnu/9.0.1/lib \
-Wl,--enable-new-dtags ${@} \
/home/rouson/Desktop/Builds/opt/opencoarrays/2.6.1-b480f1d/gnu/9.0.1/lib/libcaf_mpi.a
\
/home/rouson/Desktop/Builds/opt/mpich/3.2/gnu/9.0.1/lib/libmpifort.so \
/home/rouson/Desktop/Builds/opt/mpich/3.2/gnu/9.0.1/lib/libmpi.so \
link-error.f90
/tmp/ccU8ZmCw.o: In function `_caf_init.1.3907':
link-error.f90:(.text+0x4d): undefined reference to `caf_token.0.3905'
link-error.f90:(.text+0x5c): undefined reference to `_gfortran_caf_register'
/tmp/ccU8ZmCw.o: In function `__link_error_MOD_post_event_in_associate':
link-error.f90:(.text+0x8b): undefined reference to `caf_token.0.3905'
link-error.f90:(.text+0xae): undefined reference to `_gfortran_caf_event_post'
/tmp/ccU8ZmCw.o: In function `main':
link-error.f90:(.text+0xda): undefined reference to `_gfortran_caf_init'
link-error.f90:(.text+0x104): undefined reference to `_gfortran_caf_finalize'
collect2: error: ld returned 1 exit status
$ gfortran --version
GNU Fortran (GCC) 9.0.1 20190318 (experimental)
