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 ‘what’: b.c:5:5: warning: passing argument 2 of ‘__gmpz_urandomm’ 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 ‘struct __gmp_randstate_struct *’ but argument is of type ‘struct __mpz_struct *’ __GMP_DECLSPEC void mpz_urandomm (mpz_ptr, gmp_randstate_t, mpz_srcptr); ^ b.c:5:5: warning: passing argument 3 of ‘__gmpz_urandomm’ 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 ‘mpz_srcptr’ but argument is of type ‘struct __gmp_randstate_struct *’ __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.