https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69304
Bug ID: 69304
Summary: Fortran logical common block equivalence lto
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: physiker at toast2 dot net
Target Milestone: ---
Compiling m.f90 and f.f90 into a shared library with the -flto opion active
causes a strange "warning: type of 'l' does not match original declaration".
The definition of the common block is identical in both input files (include
'l.inc'), though. The same message occurs when the files are compiled with
gcc-5.3 on osx or on linux.
l.inc
COMMON /L/ F
LOGICAL(4) F
SAVE /L/
!===========================================================================
m.f90
SUBROUTINE A
IMPLICIT NONE
INCLUDE 'l.inc'
LOGICAL(4) :: M(12)
EQUIVALENCE (M(1),F)
END SUBROUTINE A
!===========================================================================
t.f90
SUBROUTINE B
IMPLICIT NONE
INCLUDE 'l.inc'
END SUBROUTINE B
!===========================================================================
bash-3.2$ gfortran-6 -v -c -flto -fPIC -W -Wall -pedantic t.f90
Using built-in specs.
COLLECT_GCC=gfortran-6
Target: x86_64-apple-darwin13.4.0
Configured with: ../gcc/configure --enable-languages=c,c++,fortran,lto
--with-gmp=/sw --with-libiconv-prefix=/sw --with-isl=/sw --with-mpc=/sw
--with-system-zlib --program-suffix=-6
Thread model: posix
gcc version 6.0.0 20160114 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-v' '-c' '-flto' '-fPIC' '-Wextra' '-Wall' '-Wpedantic'
'-mmacosx-version-min=10.9.4' '-mtune=core2'
/usr/local/libexec/gcc/x86_64-apple-darwin13.4.0/6.0.0/f951 t.f90 -fPIC -quiet
-dumpbase t.f90 -mmacosx-version-min=10.9.4 -mtune=core2 -auxbase t -Wextra
-Wall -Wpedantic -version -flto -fPIC -fintrinsic-modules-path
/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/6.0.0/finclude -o
/var/folders/97/4qnhjhtn25s86s9hkz0h37_m0000gn/T//ccHS2R6E.s
GNU Fortran (GCC) version 6.0.0 20160114 (experimental)
(x86_64-apple-darwin13.4.0)
compiled by GNU C version 6.0.0 20160114 (experimental), GMP version
6.1.0, MPFR version 3.1.3, MPC version 1.0.3, isl version 0.14 or 0.13
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU Fortran2008 (GCC) version 6.0.0 20160114 (experimental)
(x86_64-apple-darwin13.4.0)
compiled by GNU C version 6.0.0 20160114 (experimental), GMP version
6.1.0, MPFR version 3.1.3, MPC version 1.0.3, isl version 0.14 or 0.13
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
COLLECT_GCC_OPTIONS='-v' '-c' '-flto' '-fPIC' '-Wextra' '-Wall' '-Wpedantic'
'-mmacosx-version-min=10.9.4' '-mtune=core2'
as -arch x86_64 -force_cpusubtype_ALL -o t.o
/var/folders/97/4qnhjhtn25s86s9hkz0h37_m0000gn/T//ccHS2R6E.s
COMPILER_PATH=/usr/local/libexec/gcc/x86_64-apple-darwin13.4.0/6.0.0/:/usr/local/libexec/gcc/x86_64-apple-darwin13.4.0/6.0.0/:/usr/local/libexec/gcc/x86_64-apple-darwin13.4.0/:/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/6.0.0/:/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/
LIBRARY_PATH=/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/6.0.0/:/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/6.0.0/../../../
COLLECT_GCC_OPTIONS='-v' '-c' '-flto' '-fPIC' '-Wextra' '-Wall' '-Wpedantic'
'-mmacosx-version-min=10.9.4' '-mtune=core2'
bash-3.2$ gfortran-6 -v -c -flto -fPIC -W -Wall -pedantic m.f90
Using built-in specs.
COLLECT_GCC=gfortran-6
Target: x86_64-apple-darwin13.4.0
Configured with: ../gcc/configure --enable-languages=c,c++,fortran,lto
--with-gmp=/sw --with-libiconv-prefix=/sw --with-isl=/sw --with-mpc=/sw
--with-system-zlib --program-suffix=-6
Thread model: posix
gcc version 6.0.0 20160114 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-v' '-c' '-flto' '-fPIC' '-Wextra' '-Wall' '-Wpedantic'
'-mmacosx-version-min=10.9.4' '-mtune=core2'
/usr/local/libexec/gcc/x86_64-apple-darwin13.4.0/6.0.0/f951 m.f90 -fPIC -quiet
-dumpbase m.f90 -mmacosx-version-min=10.9.4 -mtune=core2 -auxbase m -Wextra
-Wall -Wpedantic -version -flto -fPIC -fintrinsic-modules-path
/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/6.0.0/finclude -o
/var/folders/97/4qnhjhtn25s86s9hkz0h37_m0000gn/T//ccJqlXsY.s
GNU Fortran (GCC) version 6.0.0 20160114 (experimental)
(x86_64-apple-darwin13.4.0)
compiled by GNU C version 6.0.0 20160114 (experimental), GMP version
6.1.0, MPFR version 3.1.3, MPC version 1.0.3, isl version 0.14 or 0.13
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU Fortran2008 (GCC) version 6.0.0 20160114 (experimental)
(x86_64-apple-darwin13.4.0)
compiled by GNU C version 6.0.0 20160114 (experimental), GMP version
6.1.0, MPFR version 3.1.3, MPC version 1.0.3, isl version 0.14 or 0.13
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
COLLECT_GCC_OPTIONS='-v' '-c' '-flto' '-fPIC' '-Wextra' '-Wall' '-Wpedantic'
'-mmacosx-version-min=10.9.4' '-mtune=core2'
as -arch x86_64 -force_cpusubtype_ALL -o m.o
/var/folders/97/4qnhjhtn25s86s9hkz0h37_m0000gn/T//ccJqlXsY.s
COMPILER_PATH=/usr/local/libexec/gcc/x86_64-apple-darwin13.4.0/6.0.0/:/usr/local/libexec/gcc/x86_64-apple-darwin13.4.0/6.0.0/:/usr/local/libexec/gcc/x86_64-apple-darwin13.4.0/:/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/6.0.0/:/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/
LIBRARY_PATH=/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/6.0.0/:/usr/local/lib/gcc/x86_64-apple-darwin13.4.0/6.0.0/../../../
COLLECT_GCC_OPTIONS='-v' '-c' '-flto' '-fPIC' '-Wextra' '-Wall' '-Wpedantic'
'-mmacosx-version-min=10.9.4' '-mtune=core2'
bash-3.2$ gfortran-6 -shared -o lib.dylib -W -Wall -pedantic m.o t.o
l.inc:2:0: warning: type of 'l' does not match original declaration
[-Wlto-type-mismatch]
COMMON /L/ F
l.inc:2:0: note: 'l' was previously declared here
COMMON /L/ F
l.inc:2:0: note: code may be misoptimized unless -fno-strict-aliasing is used
