PGIncompatible prototype declaration for function lio_listio

Accelerated Computing HPC Compilers Legacy PGI Compilers
1

Hi,

I can not compile a file where I manually include the lio_listio prototype, even though its the same as the one from the aio.h header:

$ pgcc -V

pgcc 18.10-1 64-bit target on x86-64 Linux -tp haswell 
PGI Compilers and Tools
Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
$ $ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.4.0-2ubuntu1~18.04~ppa1' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 7.4.0 (Ubuntu 7.4.0-2ubuntu1~18.04~ppa1) 

$ cat >test-aio.c <<EOF
#include <aio.h>
EOF
$ pgcc -c test-aio.c
$ pgcc -E test-aio.c >test-aio.i
$ cat >>test-aio.c <<EOF
extern int lio_listio ( int __mode ,
		       struct aiocb \* const __list [ restrict ] ,
		       int __nent , struct sigevent \* __restrict __sig )
   ;
EOF
$ pgcc -c test-aio.c
PGC-S-0137-Incompatible prototype declaration for function lio_listio (test-aio.c: 5)
PGC/x86-64 Linux 18.10-1: compilation completed with severe errors

What am I doing wrong here?

Thanks.

Bert

2

Hi Bert,

Interesting. It looks like the use of “restrict” within the square brackets is somehow causing the compiler to see these as two different prototypes. If I remove the “restrict” from both the aio.h and your second definition, then it compiles fine.

I added a problem report (TPR#26692) and sent it to our engineers for further review.

Note that there’s a good chance that we wont fix this. The reason is that we’re moving towards using our C++ compiler, in C compatible mode (pgc++ --c), as our main C compiler on Linux. Compiling with “pgc++ --c” will compile the code as is. Granted, you’ll see is as being fixed since the old C only compiler will no longer be used.

% cat test-aio.c
#include <aio.h>
extern int lio_listio ( int __mode ,
                       struct aiocb * const __list [ restrict ] ,
                       int __nent , struct sigevent * __restrict __sig )
   ;
% pgcc -c test-aio.c
PGC-S-0137-Incompatible prototype declaration for function lio_listio (test-aio.c: 5)
% pgc++ --c -c test-aio.c
%

As a work-around, can you try using “pgc++ --c” instead?

-Mat

3

Dear Mat,

haven’t tried “pgc++ --c” on the package itself, but I find it rather hard to communicate this to the users of the package, that they should use ‘pgc++ --c’ instead of ‘pgcc’. You know, they don’t read documentation and I also can’t inject a meaningful hint when this error is issued. Thus I don’t see a need to follow this rout at all.

Thanks.

Bert[/quote]

4

Ok. 19.1’s pgcc will be equivalent to “pgc++ --c” so you wont need to reconfigure anything in your package.

For 18.10 though, this would be the work around.

-Mat

5

Dear Mat,

thanks for the heads-up.

Best,

6

This should work with pgcc in 20.1, or for earlier version try pgcc18