A developer may want to test his software with
-Werror=old-style-definition (in particular because such definitions
could be a real bug in the software). But configure fails because
autoconf (version 2.69) generates such a function definition.
For instance:
[...]
configure:4069: checking whether the C compiler works
configure:4130: gcc -O2 -Wall -Wold-style-declaration -Wold-style-definition
-Wmissing-parameter-type -Wmissing-prototypes -Wmissing-declarations
-Wmissing-field-initializers -Werror conftest.c >&5
conftest.c: In function 'main':
conftest.c:12:1: error: old-style function definition
[-Werror=old-style-definition]
main ()
^
cc1: all warnings being treated as errors
configure:4130: $? = 1
configure:4144: result: no
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "MPFR"
| #define PACKAGE_TARNAME "mpfr"
| #define PACKAGE_VERSION "3.2.0-dev"
| #define PACKAGE_STRING "MPFR 3.2.0-dev"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| #define MPFR_USE_LOGGING 1
| /* end confdefs.h. */
|
| int
| main ()
| {
|
| ;
| return 0;
| }
configure:4144: error: in `/home/vlefevre/software/mpfr':
configure:4144: error: C compiler cannot create executables
See `config.log' for more details
[...]
Are there still compilers that fail on "int main(void) { ... }"?
In any case, certainly not when the compiler has been recognized
as gcc (like here).
Also reported as Debian bug 734104:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734104
BTW, this old-style definition also makes configure fail with
CompCert (http://compcert.inria.fr/).
--
Vincent Lefèvre <vinc...@vinc17.net> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
