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[Bug c/62294] New: Missing "passing argument [...] from incompatible pointer type" warning.


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62294

            Bug ID: 62294
           Summary: Missing "passing argument [...] from incompatible
                    pointer type" warning.
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Emmanuel.Thome at inria dot fr

Hi.

The following code should cause a warning.

#include <gmp.h>

void what(mpz_t a, mpz_t p, gmp_randstate_t rstate)
{
    mpz_urandomm(a, p, rstate); /* WRONG */
    mpz_urandomm(a, rstate, p); /* correct */
}

Alas, gcc-4.9.1 seems happy:
/tmp $ gcc-4.9 -W -Wall -Wextra -c b.c

gcc-4.8 moans appropriately.
/tmp $ gcc-4.8 -W -Wall -Wextra -c b.c
b.c: In function âwhatâ:
b.c:5:5: warning: passing argument 2 of â__gmpz_urandommâ from incompatible
pointer type [enabled by default]
     mpz_urandomm(a, p, rstate); /* WRONG */
     ^
In file included from b.c:1:0:
/usr/include/x86_64-linux-gnu/gmp.h:1115:21: note: expected âstruct
__gmp_randstate_struct *â but argument is of type âstruct __mpz_struct *â
 __GMP_DECLSPEC void mpz_urandomm (mpz_ptr, gmp_randstate_t, mpz_srcptr);
                     ^
b.c:5:5: warning: passing argument 3 of â__gmpz_urandommâ from incompatible
pointer type [enabled by default]
     mpz_urandomm(a, p, rstate); /* WRONG */
     ^
In file included from b.c:1:0:
/usr/include/x86_64-linux-gnu/gmp.h:1115:21: note: expected âmpz_srcptrâ but
argument is of type âstruct __gmp_randstate_struct *â
 __GMP_DECLSPEC void mpz_urandomm (mpz_ptr, gmp_randstate_t, mpz_srcptr);

Here is gcc -v:

/tmp $ gcc-4.9 -v
Using built-in specs.
COLLECT_GCC=gcc-4.9
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.1-4'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify
--enable-plugin --with-system-zlib --disable-browser-plugin
--enable-java-awt=gtk --enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.9.1 (Debian 4.9.1-4) 

I'm happy to provide any further information.

Regards,

E.

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