https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120784
Bug ID: 120784
Summary: fortran: issue with use-association renames and
interface
Product: gcc
Version: 15.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: matthew.thompson at nasa dot gov
Target Milestone: ---
Created attachment 61691
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61691&action=edit
Reproducer for bug
NOTE: I'm not sure what to title this. I've tried my best, but the Fortran guru
who found this is out of comms for a bit.
We have encountered what we believe is a compile-time but in gfortran. NAG
Fortran, ifx, lfortran and even llvm flang seem okay with this code. Our
conclusion is gfortran must be doing something wrong.
Indeed, per godbolt, every version of GNU Fortran seems to have an issue with
it.
I've attached the reproducer and:
❯ gfortran-14 -v -save-temps -c test.F90
Using built-in specs.
COLLECT_GCC=gfortran-14
Target: aarch64-apple-darwin24
Configured with: ../configure
--prefix=/Users/mathomp4/.homebrew/brew/opt/gcc@14
--libdir=/Users/mathomp4/.homebrew/brew/opt/gcc@14/lib/gcc/14 --disable-nls
--enable-checking=release --with-gcc-major-version-only
--enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-14
--with-gmp=/Users/mathomp4/.homebrew/brew/opt/gmp
--with-mpfr=/Users/mathomp4/.homebrew/brew/opt/mpfr
--with-mpc=/Users/mathomp4/.homebrew/brew/opt/libmpc
--with-isl=/Users/mathomp4/.homebrew/brew/opt/isl
--with-zstd=/Users/mathomp4/.homebrew/brew/opt/zstd --with-pkgversion='Homebrew
GCC 14.3.0' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues
--with-system-zlib --build=aarch64-apple-darwin24
--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.3.0 (Homebrew GCC 14.3.0)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-c' '-mmacosx-version-min=15.5'
'-asm_macosx_version_min=15.5' '-nodefaultexport' '-mcpu=apple-m1'
'-mlittle-endian' '-mabi=lp64'
/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../libexec/gcc/aarch64-apple-darwin24/14/f951
test.F90 -cpp=test.fii -quiet -v -iprefix
/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../lib/gcc/14/gcc/aarch64-apple-darwin24/14/
-D__DYNAMIC__ test.F90 -fPIC -quiet -dumpbase test.F90 -dumpbase-ext .F90
-mmacosx-version-min=15.5 -mcpu=apple-m1 -mlittle-endian -mabi=lp64 -version
-fintrinsic-modules-path
/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../lib/gcc/14/gcc/aarch64-apple-darwin24/14/finclude
-o test.s
GNU Fortran (Homebrew GCC 14.3.0) version 14.3.0 (aarch64-apple-darwin24)
compiled by GNU C version 14.3.0, GMP version 6.3.0, MPFR version
4.2.2, MPC version 1.3.1, isl version isl-0.27-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../lib/gcc/14/gcc/aarch64-apple-darwin24/14/../../../../../../aarch64-apple-darwin24/include"
ignoring duplicate directory
"/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../lib/gcc/14/gcc/../../../../lib/gcc/14/gcc/aarch64-apple-darwin24/14/include"
ignoring nonexistent directory
"/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/local/include"
ignoring duplicate directory
"/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../lib/gcc/14/gcc/../../../../lib/gcc/14/gcc/aarch64-apple-darwin24/14/include-fixed"
ignoring nonexistent directory
"/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../lib/gcc/14/gcc/../../../../lib/gcc/14/gcc/aarch64-apple-darwin24/14/../../../../../../aarch64-apple-darwin24/include"
#include "..." search starts here:
#include <...> search starts here:
/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../lib/gcc/14/gcc/aarch64-apple-darwin24/14/finclude
/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../lib/gcc/14/gcc/aarch64-apple-darwin24/14/include
/Users/mathomp4/.homebrew/brew/Cellar/gcc@14/14.3.0/bin/../lib/gcc/14/gcc/aarch64-apple-darwin24/14/include-fixed
/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk/usr/include
End of search list.
test.F90:27:22:
27 | end interface MyGet
| 1
Error: Expecting 'END INTERFACE get' at (1)
test.F90:29:8:
29 | contains
| 1
Error: Unexpected CONTAINS statement in INTERFACE block at (1)
test.F90:33:13:
33 | c = 'a'
| 1
Error: Unexpected assignment statement at (1) in INTERFACE body
test.F90:36:3:
36 | end module B_MOD
| 1
Error: Expecting END INTERFACE statement at (1)
f951: Error: Unexpected end of file in 'test.F90'
