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* [Bug preprocessor/107794] New: can't use the string "linux-" via stringizing in the preprocessor
@ 2022-11-21 14:16 coder5506 at pobox dot com
2022-11-21 14:21 ` [Bug preprocessor/107794] " redi at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: coder5506 at pobox dot com @ 2022-11-21 14:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107794
Bug ID: 107794
Summary: can't use the string "linux-" via stringizing in the
preprocessor
Product: gcc
Version: 11.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: coder5506 at pobox dot com
Target Milestone: ---
The program (scratch.c):
#include <stdio.h>
#define str(s) #s
#define xstr(s) str(s)
#define STRING linux-aarch64.cf
int main() {
printf("%s\n", xstr(STRING));
}
The output (running ./a.out):
1-aarch64.cf
Expected output:
linux-aarch64.cf
It works as expected for any string not exactly matching "linux-", but in
everything I've tried "linux-" is always shortened to "l-" even when not at the
beginning of the string.
> the exact version of GCC;
> the system type;
gcc 10.2.1 on Debian 11 x86_64
gcc 10.2.1 on Armbian (Debian 11) aarch64
gcc 11.3.0 on Arbmian (Debian 11) aarch64
> the options given when GCC was configured/built;
In building 11.3.0, I passed "--enable-languages=c --disable-multilib"
> the complete command line that triggers the bug;
gcc -Wall -Wextra -save-temps scratch.c
> the compiler output (error messages, warnings, etc.); and
none
> the preprocessed file (*.i*) that triggers the bug, generated by adding -save-temps to the complete compilation command
Truncated, but here's how it ends
# 858 "/usr/include/stdio.h" 3 4
extern int __uflow (FILE *);
extern int __overflow (FILE *, int);
# 873 "/usr/include/stdio.h" 3 4
# 2 "scratch.c" 2
# 5 "scratch.c"
int main() {
printf("%s\n", "1-aarch64.cf");
}
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug preprocessor/107794] can't use the string "linux-" via stringizing in the preprocessor
2022-11-21 14:16 [Bug preprocessor/107794] New: can't use the string "linux-" via stringizing in the preprocessor coder5506 at pobox dot com
@ 2022-11-21 14:21 ` redi at gcc dot gnu.org
2022-11-21 14:24 ` pinskia at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: redi at gcc dot gnu.org @ 2022-11-21 14:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107794
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
"linux" is a predefined macro. Compile with -std=c17 instead of the default
-std=gnu17 to disable that.
See https://gcc.gnu.org/onlinedocs/cpp/System-specific-Predefined-Macros.html
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug preprocessor/107794] can't use the string "linux-" via stringizing in the preprocessor
2022-11-21 14:16 [Bug preprocessor/107794] New: can't use the string "linux-" via stringizing in the preprocessor coder5506 at pobox dot com
2022-11-21 14:21 ` [Bug preprocessor/107794] " redi at gcc dot gnu.org
@ 2022-11-21 14:24 ` pinskia at gcc dot gnu.org
2022-11-21 14:33 ` coder5506 at pobox dot com
2022-11-21 16:25 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-11-21 14:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107794
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Why do you think this is a bug?
linux is defined somewhere, either by gcc or by the headers. I think it is
predefined and disabled by using -std=c11.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug preprocessor/107794] can't use the string "linux-" via stringizing in the preprocessor
2022-11-21 14:16 [Bug preprocessor/107794] New: can't use the string "linux-" via stringizing in the preprocessor coder5506 at pobox dot com
2022-11-21 14:21 ` [Bug preprocessor/107794] " redi at gcc dot gnu.org
2022-11-21 14:24 ` pinskia at gcc dot gnu.org
@ 2022-11-21 14:33 ` coder5506 at pobox dot com
2022-11-21 16:25 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: coder5506 at pobox dot com @ 2022-11-21 14:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107794
--- Comment #3 from Eric Sessoms <coder5506 at pobox dot com> ---
I thought it was a bug b/c it worked as I expected in clang. You're right, I
didn't think it through. Sorry to have wasted your time, but thanks for
setting me straight.
Please close, invalid.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug preprocessor/107794] can't use the string "linux-" via stringizing in the preprocessor
2022-11-21 14:16 [Bug preprocessor/107794] New: can't use the string "linux-" via stringizing in the preprocessor coder5506 at pobox dot com
` (2 preceding siblings ...)
2022-11-21 14:33 ` coder5506 at pobox dot com
@ 2022-11-21 16:25 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-11-21 16:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107794
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Invalid because linux is a predefined as mentioned.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-11-21 16:25 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2022-11-21 14:16 [Bug preprocessor/107794] New: can't use the string "linux-" via stringizing in the preprocessor coder5506 at pobox dot com
2022-11-21 14:21 ` [Bug preprocessor/107794] " redi at gcc dot gnu.org
2022-11-21 14:24 ` pinskia at gcc dot gnu.org
2022-11-21 14:33 ` coder5506 at pobox dot com
2022-11-21 16:25 ` pinskia at gcc dot gnu.org
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