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* [Bug modula2/108493] New: Interaction with implicit includes and -traditional-cpp
@ 2023-01-23 11:07 iains at gcc dot gnu.org
2023-01-23 11:33 ` [Bug modula2/108493] " iains at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: iains at gcc dot gnu.org @ 2023-01-23 11:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108493
Bug ID: 108493
Summary: Interaction with implicit includes and
-traditional-cpp
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: modula2
Assignee: gaius at gcc dot gnu.org
Reporter: iains at gcc dot gnu.org
Target Milestone: ---
On powerpc-apple-darwin, we -include 'altivec.h' which predefines some relevant
vector stuff...
(This is behind the scenes, not a user action, when the VMX instruction set is
in use, which is essentially always in reality)
The contains the following line
#define vector __vector
-----
before starting ; To be fair, I am not 100% sure if there's also a bug in the
traditional-cpp impl.
----
$ cat t.mod
MODULE T
IMPORT bug ;
BEGIN
END T.
$ cat bug.def
(* vector *)
$ grep vector
/opt/iains/powerpc-apple-darwin9/gcc-13-0-1-wip/lib/gcc/powerpc-apple-darwin9/13.0.1/include/altivec.h
/* If __APPLE_ALTIVEC__ is defined, the compiler supports 'vector',
#define vector __vector
---- bug.def is preprocessed recursively from the main.
$ gcc/cc1 -E -v -iprefix
/scratch/10-5-leo/gcc-master-wip/gcc/../lib/gcc/powerpc-apple-darwin9/13.0.1/
-isystem gcc/include -isystem gcc/include-fixed -iplugindir=gcc/plugin -D
__DYNAMIC__ -iplugindir=gcc/plugin -fPIC -dumpbase t.mod -dumpbase-ext .mod
-mmacosx-version-min=10.5.0 -traditional-cpp -version bug.def
# 0 "<command-line>"
# 1 "bug.def"
bug.def:2: error: detected recursion whilst expanding macro "vector"
2 | (* vector *)
regular CPP does not exhibit this problem - is there a reason we need to use
"traditional" ?
As noted there could be a bug with the preprocessor too .. I do not know.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug modula2/108493] Interaction with implicit includes and -traditional-cpp
2023-01-23 11:07 [Bug modula2/108493] New: Interaction with implicit includes and -traditional-cpp iains at gcc dot gnu.org
@ 2023-01-23 11:33 ` iains at gcc dot gnu.org
2023-01-23 12:14 ` [Bug target/108493] Interaction with builtin_defines (on PowerPC) " iains at gcc dot gnu.org
2024-01-29 7:35 ` gaius at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: iains at gcc dot gnu.org @ 2023-01-23 11:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108493
--- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> ---
I can reproduce this with C - so it's not specifically a module-2 issue (but
the use of traditional-cpp does trigger it .. and for keywords within (* *) so
we need to figure out what the intended semantics are.
----
# 0 "t.c"
# 0 "<built-in>"
# 0 "<command-line>"
# 1 "t.c"
t.c:2: error: detected recursion whilst expanding macro "vector"
2 | vector X;
|
vector X;
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/108493] Interaction with builtin_defines (on PowerPC) and -traditional-cpp
2023-01-23 11:07 [Bug modula2/108493] New: Interaction with implicit includes and -traditional-cpp iains at gcc dot gnu.org
2023-01-23 11:33 ` [Bug modula2/108493] " iains at gcc dot gnu.org
@ 2023-01-23 12:14 ` iains at gcc dot gnu.org
2024-01-29 7:35 ` gaius at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: iains at gcc dot gnu.org @ 2023-01-23 12:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108493
Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Target| |powerpc-darwin,
| |powerpc64-linux-gnu
Component|modula2 |target
Status|UNCONFIRMED |NEW
Last reconfirmed| |2023-01-23
Assignee|gaius at gcc dot gnu.org |unassigned at gcc dot gnu.org
Summary|Interaction with implicit |Interaction with
|includes and |builtin_defines (on
|-traditional-cpp |PowerPC) and
| |-traditional-cpp
--- Comment #2 from Iain Sandoe <iains at gcc dot gnu.org> ---
this repeats on linux-gnu.
There are the following defines in gcc/config/rs6000/rs6000-c.cc (conditional
on !iso) :
builtin_define ("vector=vector");
builtin_define ("pixel=pixel");
builtin_define ("bool=bool");
builtin_define ("_Bool=_Bool");
they've been there since 2008 .. so I guess no-one cares ( until the modula-2
case triggers it ).
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug target/108493] Interaction with builtin_defines (on PowerPC) and -traditional-cpp
2023-01-23 11:07 [Bug modula2/108493] New: Interaction with implicit includes and -traditional-cpp iains at gcc dot gnu.org
2023-01-23 11:33 ` [Bug modula2/108493] " iains at gcc dot gnu.org
2023-01-23 12:14 ` [Bug target/108493] Interaction with builtin_defines (on PowerPC) " iains at gcc dot gnu.org
@ 2024-01-29 7:35 ` gaius at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: gaius at gcc dot gnu.org @ 2024-01-29 7:35 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108493
Gaius Mulley <gaius at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |gaius at gcc dot gnu.org
--- Comment #3 from Gaius Mulley <gaius at gcc dot gnu.org> ---
I wonder if writing a filter program to strip comments out before cpp would fix
the problem.
The filter program (m2decom) would strip out any comment which does not have
'#' in the first column (and honour line continuation backslashes etc). This
would allow the debugging technique in gcc/m2/gm2-libs/FormatStrings.mod to
work.
If I recall correctly the reason cpp -traditional is required is because ' is a
start of string character in m2 (so is "). But the m2 string formed: '\'
causes:
$ gcc -x c -E ~/GCC/gcc-read-write/gcc/m2/gm2-libs/FormatStrings.mod
<snip>
DSdbEnter ;
d := InitString ('') ;
/home/gaius/GCC/gcc-read-write/gcc/m2/gm2-libs/FormatStrings.mod:196:19:
warning: missing terminating ' character
196 | i := Index (s, '\', 0) ;
| ^
i := Index (s, '\', 0) ;
^ permalink raw reply [flat|nested] 4+ messages in thread
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2023-01-23 11:07 [Bug modula2/108493] New: Interaction with implicit includes and -traditional-cpp iains at gcc dot gnu.org
2023-01-23 11:33 ` [Bug modula2/108493] " iains at gcc dot gnu.org
2023-01-23 12:14 ` [Bug target/108493] Interaction with builtin_defines (on PowerPC) " iains at gcc dot gnu.org
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