PGI 18.4: undefined reference to `__builtin_constant_p`

Accelerated Computing HPC Compilers Legacy PGI Compilers
#1

Dear all,

when compiling and linking the following code I get the aforementioned link error:

$ pgcc --version

pgcc 18.4-0 64-bit target on x86-64 Linux -tp haswell 
PGI Compilers and Tools
Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
$ cat >swab.c <<EOC
#include <linux/swab.h>

int main(int i, char *a[]) {
    return __swab32(42u);
}
EOC
$ pgcc swab.c
/tmp/pgccG7xgGx-Pb9r0.o: In function `main':
/home/wesarg/tmp/pgi.PHHQ/./swab.c:4: undefined reference to `__builtin_constant_p'

This happens with the LLVM variant too. This happens on a recent Ubuntu installation with GCC 7. I can provide the result of preprocessing, if requested.

My workaround is to add this line to the _c_macros.h:

#define __builtin_constant_p(x) (0)
#2

Sorry, someone ate the ‘#’ in the ‘#include’ statement

#3

Any comments?

#4

What version of OS are you running? Might be useful to post your localrc file from the compiler bin directory.

#5

This is observable on Ubuntu 18.04 (kernel 4.18) and 16.04 (kernel 4.4) x86-64. And it still happens with PGI 18.10.

#6

Hi Bert,

It looks like we don’t support __builtin_constant_p yet. It would seem that any macro that relies on this builtin will fail when it is expanded out. I opened TPR#26861 to address it.