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Top Forums Programming -Warray-bounds option to GCC compiler Post 303013012 by milhan on Tuesday 13th of February 2018 05:13:27 PM
Old 02-13-2018
-Warray-bounds option to GCC compiler

What exactly is the -Warray-bounds option to the GCC compiler supposed to warn about?
the man page states:
Quote:
-Warray-bounds
-Warray-bounds=n
This option is only active when -ftree-vrp is active (default for -O2 and above). It warns
about subscripts to arrays that are always out of bounds. This warning is enabled by -Wall.

-Warray-bounds=1
This is the warning level of -Warray-bounds and is enabled by -Wall; higher levels are
not, and must be explicitly requested.

-Warray-bounds=2
This warning level also warns about out of bounds access for arrays at the end of a
struct and for arrays accessed through pointers. This warning level may give a larger
number of false positives and is deactivated by default.
Code:
~ g++ --version
g++ (GCC) 7.3.1 20180130 (Red Hat 7.3.1-2)
Copyright (C) 2017 Free Software Foundation, Inc.

Thank you.
 

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FC(1)							      General Commands Manual							     FC(1)

NAME
fc - frontend script to the f2c fortran compiler SYNOPSIS
/usr/bin/fc [-o objfile] [-c] [-S] [-C] [-u] [-w] [-w66] [-D switch] [-I includepath] [-Ntnnn] [-P] files [-l library] DESCRIPTION
fc is a script intended to be used as a front end to the f2c FORTRAN-to-C translator. It is supposed to make the whole f2c and C compiler setup look like a real Fortran compiler. File arguments with a .f suffix are compiled as Fortran source. Files with a .F suffix are passed through the C preprocessor cpp(1) first. Files with .c (C source) or .s (assembly source) suffixes are passed to the C compiler directly. Files with a .e suffix are treated as efl source files, and files with a .r suffix are treated as RATFOR source files. OPTIONS
-o objfile Produce an output executable named objfile rather than using the default name a.out. -c Do not call the linker; instead, leave relocatable object files as *.o. -S Produce assembly output as file.s -C Compile in extra code to check that array subscripts are in bounds. -l library Libraries specified with this option are passed to the linker. -U def Definitions specified with this option are passed to C compiler (for .c files) or to cpp (for .F files) to remove definition. -u Complain about undeclared variables. -v, --version Print version of f2c in use -w Omit all warning messages. -w66 Omit Fortran 66 (Fortran IV) compatibility warning messages. -D switch The given switch is passed to the C compiler (for .c files), to cpp (for .F files) and to f2c. -I includepath Passed to the C compiler (for .c files), to cpp (for .F files) and to f2c. -Ntnnn Allow nnn entries in table t. -P Emit .P files. BUGS
fc isn't really very good -- try fort77 (1), which does a better job. This manual page isn't really very good either... AUTHOR
S. Feldman, D. Gay, M. Maimone, N, Schryer are all mentioned in the paper on the conversion of Fortran to C. Peter Maydell (pmaydell@chiark.greenend.org.uk) wrote this manual page, and Alan Bain (alanb@chiark.greenend.org.uk) made some minor modi- fications. SEE ALSO
f2c(1), fort77(1), cc(1), cpp(1), ratfor(1) May 1999 FC(1)
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