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configure: fix double check tests with Clang 

Configuring with Clang compiler with -Werror would not work after
improved checks:
/tmp/qemu-conf--25992-.c:4:32: error: self-comparison always evaluates
to true [-Werror,-Wtautological-compare]
int main(void) { return preadv == preadv; }
/tmp/qemu-conf--25992-.c:13:26: error: self-comparison always
evaluates to true [-Werror,-Wtautological-compare]
    return epoll_create1 == epoll_create1;
/tmp/qemu-conf--25992-.c:3:13: error: explicitly assigning a variable
of type 'char **' to itself [-Werror,-Wself-assign]
    environ = environ;

Avoid the errors by adjusting the tests.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Blue Swirl 2012-08-09 20:21:25 +00:00
parent 8dc38a78d0
commit c075a72399
1 changed files with 3 additions and 3 deletions
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6
configure vendored
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@ -2256,7 +2256,7 @@ cat > $TMPC <<EOF
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
int main(void) { return preadv == preadv; }
int main(void) { return preadv(0, 0, 0, 0); }
EOF
preadv=no
if compile_prog "" "" ; then
@ -2552,7 +2552,7 @@ int main(void)
* warning but not an error, and will proceed to fail the
* qemu compile where we compile with -Werror.)
*/
return epoll_create1 == epoll_create1;
return (int)(uintptr_t)&epoll_create1;
}
EOF
if compile_prog "" "" ; then
@ -2945,7 +2945,7 @@ has_environ=no
cat > $TMPC << EOF
#include <unistd.h>
int main(void) {
environ = environ;
environ = 0;
return 0;
}
EOF