Re: Possible bug in argp

BTW, I am using argp 1.3 installed via homebrew:=C2=A0

=C2=A0/usr/local/Cellar/argp-standalone/1.3/include/argp.h=C2=A0



I am running macOS 11.4 with gcc -v:=C2=A0

Configured with: --prefix=3D/Library/Developer/CommandLineTools/usr --with-=
gxx-include-dir=3D/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/i=
nclude/c++/4.2.1

Apple clang version 12.0.5 (clang-1205.0.22.9)

Target: x86_64-apple-darwin20.5.0

Thread model: posix

InstalledDir: /Library/Developer/CommandLineTools/usr/bin










---- On Sat, 07 Aug 2021 18:29:22 +0800 Guangxin Yang <[email protected]> wrote=
 ----







Hello there,=C2=A0



There may be a bug on macOS when calling arpg_help() with options having a =
non-NULL arg value in the argp_option.=C2=A0



For the example=C2=A0https://www.gnu.org/software/libc/manual/html_node/Arg=
p-Example-3.html, I added a case like this:=C2=A0




=C2=A0 =C2=A0 case ARGP_KEY_NO_ARGS:

=C2=A0 =C2=A0 =C2=A0 argp_help(state->root_argp,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 stderr,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ARGP_HELP_BUG_ADDR | ARGP_HELP_DOC | ARG=
P_HELP_USAGE | ARGP_HELP_LONG,

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 state->name);

=C2=A0 =C2=A0 =C2=A0 exit(1);



Compile and run without providing any arguments, I got a Segmentation fault=
.=C2=A0

The output looks like this:=C2=A0



Usage: t [-qsv?V] [-o FILE] [--output=3DFILE] [--quiet] [--silent] [--verbo=
se]

=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 [--help] [--usage] [--version] AR=
G1 ARG2

Argp example #3 -- a program with options and arguments using argp



=C2=A0 -o, --output=3DFILE=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Output to FILE=
 instead of standard output

=C2=A0 -q, -s, --quiet, --silent=C2=A0 Don't produce any output

=C2=A0 -v, --verbose=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Produc=
e verbose output

=C2=A0 -?, --help =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 G=
ive this help list

=C2=A0 =C2=A0 =C2=A0 --usage=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 Give a short usage message

=C2=A0 -V, Segmentation fault: 11



If I comment out these two lines:=C2=A0

21 =C2=A0 {"output", =C2=A0 'o', "FILE", 0,

22=C2=A0 =C2=A0 "Output to FILE instead of standard output" },



Things work perfectly.=C2=A0



On Redhat it is all ok.=C2=A0



I attached the modified example FYI.=C2=A0



Thanks for creating this wonderful piece.=C2=A0 :-0



Regards

Guangxin=C2=A0