URL:
<http://savannah.gnu.org/bugs/?24623>
Summary: Discrepancy between Reference Manual A.4 and #elif
Project: GNU Scientific Library
Submitted by: reioa
Submitted on: 2008年10月21日 20時39分08秒
Category: None
Severity: 3 - Normal
Operating System: Debian GNU/Linux
Status: None
Assigned to: None
Open/Closed: Open
Release: 1.11
Discussion Lock: Any
_______________________________________________________
Details:
I tried to compile a program with CGG waring options mentioned in Reference
Manual A.4 GCC warning options for numerical programs, but GCC returned error
as shown below.
gcc -DHAVE_CONFIG_H -I. -I.. -g -O2 -ansi -pedantic -Werror -Wall -W
-Wmissing-prototypes -Wstrict-prototypes -Wtraditional -Wconversion -Wshadow
-Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings -Wnested-externs
-fshort-enums -fno-common -Dinline= -g -O4 -g -O2 -MT ****.o -MD -MP -MF
.deps/****.Tpo -c -o ****.o ****.c
In file included from /home/***/include/gsl/gsl_math.h:26,
from /home/***/include/gsl/gsl_fit.h:24,
from ****.c:5:
/home/***/include/gsl/gsl_nan.h:26:2: error: suggest not using #elif in
traditional C
/home/***/include/gsl/gsl_nan.h:36:2: error: suggest not using #elif in
traditional C
Removing -Wtraditional option, the compile was successfully compleated.
If these waring options is recomended officially, GSL itself ought not to
block use of the options, I think.
The problematic part is like this.
#ifdef aaa
bbb
#elif ccc
ddd
#else
eee
#endif
This code can be switched to a code in below.
#ifdef aaa
bbb
#else
#ifdef ccc
ddd
#else
eee
#endif
#endif
I would like to take the modification into account.
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