Regression with fpp 2025.2.0

Matt_Thompson — Wed, 16 Jul 2025 13:41:38 GMT

A library I help maintain cannot be compiled by ifx 2025.2.0 because there seems to be a bug in fpp 2025.2.0

An example is this code:

#define __VERIFY__(a) if(internal_verify(a,rc=rc)) return #define __RC__ rc=status); __VERIFY__(status foo(__RC__)

This is a *very* whittled down version of what the actual code is, but it demonstrates the issue.

To wit, using fpp 2025.2.0:

> fpp -V Intel(R) Fortran Preprocessor for applications running on Intel(R) 64, Version 2025.2.0 Build 20250605 Copyright (C) 1985-2025 Intel Corporation. All rights reserved. ^C > fpp Lexer.F90 # 1 "Lexer.F90" Lexer.F90(3): #error: number of arguments doesn't match. foo(rc=status); if(internal_verify(status,rc=rc)) return > echo $? 1

Now we use fpp 2025.1.0:

> fpp -V Intel(R) Fortran Preprocessor for applications running on Intel(R) 64, Version 2025.1.0 Build 20250317 Copyright (C) 1985-2025 Intel Corporation. All rights reserved. ^C > fpp Lexer.F90 # 1 "Lexer.F90" foo(rc=status); if(internal_verify(status,rc=rc)) return > echo $? 0

Note that the preprocessor returns the exact same code but fpp 2025.2.0 returns an error message and a non-zero-status code. Thus, ifx halts since fpp is failing.

I will also say every other preprocessor I've tried works as well. cpp:

> cpp --version cpp (GCC) 15.1.0 Copyright (C) 2025 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. > cpp Lexer.F90 # 0 "Lexer.F90" # 0 "<built-in>" # 0 "<command-line>" # 1 "/usr/include/stdc-predef.h" 1 3 4 # 0 "<command-line>" 2 # 1 "Lexer.F90" foo(rc=status); if(internal_verify(status,rc=rc)) return > echo $? 0

and NAG Fortran:

> nagfor -V NAG Fortran Compiler Release 7.2(Shin-Urayasu) Build 7228 Product NPL6A72NA for x86-64 Linux Copyright 1990-2024 The Numerical Algorithms Group Ltd., Oxford, U.K. > nagfor -F Lexer.F90 NAG Fortran Compiler Release 7.2(Shin-Urayasu) Build 7228 > echo $? 0 > cat Lexer.f90 # 1 "Lexer.F90" foo(rc=status); if(internal_verify(status,rc=rc)) return

And, as before, the resulting processed code is always the same.

I suppose I could do something like:

ifx -fpp-name=/path/to/cpp

but I'm not sure if cpp does all the same stuff fpp does and if we are relying on some fpp-only macro.

Re: Regression with fpp 2025.2.0

Matt_Thompson — Tue, 19 Aug 2025 18:50:43 GMT

Update. It looks like fpp 2025.2.1 does NOT fix this, sadly:

> cat test.F90 #define __VERIFY__(a) if(internal_verify(a,rc=rc)) return #define __RC__ rc=status); __VERIFY__(status foo(__RC__) > fpp -V Intel(R) Fortran Preprocessor for applications running on Intel(R) 64, Version 2025.2.1 Build 20250806 Copyright (C) 1985-2025 Intel Corporation. All rights reserved. ^C > fpp ./test.F90 # 1 "test.F90" test.F90(3): #error: number of arguments doesn't match. foo(rc=status); if(internal_verify(status,rc=rc)) return > echo $? 1

topic Regression with fpp 2025.2.0 in Intel® Fortran Compiler

Regression with fpp 2025.2.0

Re: Regression with fpp 2025.2.0