https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69370
Bug ID: 69370
Summary: Fortran spurious warning (regression)?
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: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Build: gcc version 6.0.0 20160114
Compiling t.f90 with option -Wconversion active generates the warning 'Change
of value in conversion from ‘REAL(8)’ to ‘REAL(4)’. This warning does not occur
when the code is compiled by gcc 5.3 or gcc 4.4. The warning is not present if
undef is set to less than about 2d10. I would appreciate it very much if the
warning is expected.
t.f90
program t
real(8),parameter :: undef=3.33d33
real(4),parameter :: undef4=real(undef,4)
end program t
gcc-6:
gfortran-6 -v -Wconversion t.f90
Driving: gfortran-6 -v -Wconversion t.f90 -l gfortran -l m -shared-libgcc
Using built-in specs.
COLLECT_GCC=gfortran-6
COLLECT_LTO_WRAPPER=/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/fsy/peschmid/lnx/sw
--with-gmp=/home/fsy/peschmid/lnx/sw --with-mpfr=/home/fsy/peschmid/lnx/sw
--with-mpc=/home/fsy/peschmid/lnx/sw --with-isl=/home/fsy/peschmid/lnx/sw
--enable-__cxa_atexit --enable-languages=c,c++,fortran --program-suffix=-6
Thread model: posix
gcc version 6.0.0 20160114 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-v' '-Wconversion' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.0.0/f951
t.f90 -quiet -dumpbase t.f90 -mtune=generic -march=x86-64 -auxbase t
-Wconversion -version -fintrinsic-modules-path
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/finclude
-o /tmp/ccmDPJqS.s
GNU Fortran (GCC) version 6.0.0 20160114 (experimental) (x86_64-pc-linux-gnu)
compiled by GNU C version 6.0.0 20160114 (experimental), GMP version
6.0.0, 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-pc-linux-gnu)
compiled by GNU C version 6.0.0 20160114 (experimental), GMP version
6.0.0, 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
t.f90:3:35:
real(4),parameter :: undef4=real(undef,4)
1
Warning: Change of value in conversion from ‘REAL(8)’ to ‘REAL(4)’ at (1)
[-Wconversion]
COLLECT_GCC_OPTIONS='-v' '-Wconversion' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/../../../../x86_64-pc-linux-gnu/bin/as
-v --64 -o /tmp/cc5lgPHU.o /tmp/ccmDPJqS.s
GNU assembler version 2.25.51.0.4 (x86_64-pc-linux-gnu) using BFD version
(Linux/GNU Binutils) 2.25.51.0.4.20151114
Reading specs from
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/../../../../lib64/libgfortran.spec
rename spec lib to liborig
COLLECT_GCC_OPTIONS='-v' '-Wconversion' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
COMPILER_PATH=/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.0.0/:/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/../../../../x86_64-pc-linux-gnu/bin/
LIBRARY_PATH=/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/opt/intel/composer_xe_2013.1.117/compiler/lib/intel64/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/../../../../x86_64-pc-linux-gnu/lib/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-Wconversion' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.0.0/collect2
-plugin
/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.0.0/liblto_plugin.so
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-plugin-opt=-fresolution=/tmp/ccoi1UZW.res -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lquadmath
-plugin-opt=-pass-through=-lm -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc
--eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2
/usr/lib/../lib64/crt1.o /usr/lib/../lib64/crti.o
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/crtbegin.o
-L/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0
-L/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc
-L/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/../../../../lib64
-L/lib/../lib64 -L/usr/lib/../lib64
-L/opt/intel/composer_xe_2013.1.117/compiler/lib/intel64
-L/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/../../../../x86_64-pc-linux-gnu/lib
-L/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/../../..
/tmp/cc5lgPHU.o -lgfortran -lm -lgcc_s -lgcc -lquadmath -lm -lgcc_s -lgcc -lc
-lgcc_s -lgcc
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-pc-linux-gnu/6.0.0/crtend.o
/usr/lib/../lib64/crtn.o
COLLECT_GCC_OPTIONS='-v' '-Wconversion' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
gcc-5.3:
gfortran -v -Wconversion t.f90
Driving: gfortran -v -Wconversion t.f90 -l gfortran -l m -shared-libgcc
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-unknown-linux-gnu/5.3.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-5.3.0/configure --prefix=/home/fsy/peschmid/lnx/sw
--with-gmp=/home/fsy/peschmid/lnx/sw --with-mpfr=/home/fsy/peschmid/lnx/sw
--with-mpc=/home/fsy/peschmid/lnx/sw --with-isl=/home/fsy/peschmid/lnx/sw
--enable-__cxa_atexit
Thread model: posix
gcc version 5.3.0 (GCC)
COLLECT_GCC_OPTIONS='-v' '-Wconversion' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-unknown-linux-gnu/5.3.0/f951
t.f90 -quiet -dumpbase t.f90 -mtune=generic -march=x86-64 -auxbase t
-Wconversion -version -fintrinsic-modules-path
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/finclude
-o /tmp/ccxQbqiJ.s
GNU Fortran (GCC) version 5.3.0 (x86_64-unknown-linux-gnu)
compiled by GNU C version 5.3.0, GMP version 6.0.0, MPFR version 3.1.3,
MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU Fortran2008 (GCC) version 5.3.0 (x86_64-unknown-linux-gnu)
compiled by GNU C version 5.3.0, GMP version 6.0.0, MPFR version 3.1.3,
MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
COLLECT_GCC_OPTIONS='-v' '-Wconversion' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/../../../../x86_64-unknown-linux-gnu/bin/as
-v --64 -o /tmp/ccMTlmN9.o /tmp/ccxQbqiJ.s
GNU assembler version 2.25.1 (x86_64-unknown-linux-gnu) using BFD version (GNU
Binutils) 2.25.1
Reading specs from
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/../../../../lib64/libgfortran.spec
rename spec lib to liborig
COLLECT_GCC_OPTIONS='-v' '-Wconversion' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
COMPILER_PATH=/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-unknown-linux-gnu/5.3.0/:/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/../../../../x86_64-unknown-linux-gnu/bin/
LIBRARY_PATH=/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/opt/intel/composer_xe_2013.1.117/compiler/lib/intel64/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/../../../../x86_64-unknown-linux-gnu/lib/:/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-Wconversion' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-unknown-linux-gnu/5.3.0/collect2
-plugin
/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-unknown-linux-gnu/5.3.0/liblto_plugin.so
-plugin-opt=/common/home/fsy/peschmid/lnx/sw/bin/../libexec/gcc/x86_64-unknown-linux-gnu/5.3.0/lto-wrapper
-plugin-opt=-fresolution=/tmp/ccnVDwjA.res -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lquadmath
-plugin-opt=-pass-through=-lm -plugin-opt=-pass-through=-lgcc_s
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc
--eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2
/usr/lib/../lib64/crt1.o /usr/lib/../lib64/crti.o
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/crtbegin.o
-L/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0
-L/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc
-L/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/../../../../lib64
-L/lib/../lib64 -L/usr/lib/../lib64
-L/opt/intel/composer_xe_2013.1.117/compiler/lib/intel64
-L/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/../../../../x86_64-unknown-linux-gnu/lib
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/tmp/ccMTlmN9.o -lgfortran -lm -lgcc_s -lgcc -lquadmath -lm -lgcc_s -lgcc -lc
-lgcc_s -lgcc
/common/home/fsy/peschmid/lnx/sw/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.3.0/crtend.o
/usr/lib/../lib64/crtn.o
