compiler error with icc on Linux

[aminiussi]

I did this

with CC=icc and:

[alainm@gemini curl-7.69.1]$ icc -v
icc version 19.1.0.166 (gcc version 8.3.0 compatibility)
[alainm@gemini curl-7.69.1]$ 

$CFLAGS=-axCOMMON-AVX512 ./configure --prefix=....
$make

I got:

[alainm@gemini curl-7.69.1]$ make
Making all in lib
make[1]: Entering directory `/beegfs/SCRATCH/alainm/install/curl-7.69.1/lib'
make  all-am
make[2]: Entering directory `/beegfs/SCRATCH/alainm/install/curl-7.69.1/lib'
  CC       libcurl_la-mime.lo
icc: command line remark #10148: option '-vec-report0' not supported
In file included from urldata.h(92),
                 from mime.c(30):
/usr/include/netinet/in.h(376): error: expected a type specifier
  extern uint16_t ntohs (uint16_t __netshort)
                  ^

In file included from urldata.h(92),
                 from mime.c(30):
/usr/include/netinet/in.h(380): error: expected a type specifier
  extern uint16_t htons (uint16_t __hostshort)
                  ^

compilation aborted for mime.c (code 2)
make[2]: *** [libcurl_la-mime.lo] Error 1
make[2]: Leaving directory `/beegfs/SCRATCH/alainm/install/curl-7.69.1/lib'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/beegfs/SCRATCH/alainm/install/curl-7.69.1/lib'
make: *** [all-recursive] Error 1
[alainm@gemini curl-7.69.1]$ 

Once I preprocessed explicitly with -E, it appear that the compile code was:

[alainm@gemini lib]$ icc truc.c
In file included from urldata.h(91),
                 from mime.c(30):
/usr/include/netinet/in.h(376): error: expected a type specifier
  extern uint16_t curlx_ntohs((uint16_t __netshort))
                              ^

In file included from urldata.h(91),
                 from mime.c(30):
/usr/include/netinet/in.h(380): error: expected a type specifier
  extern uint16_t curlx_htons((uint16_t __hostshort))
                              ^

compilation aborted for truc.c (code 2)
[alainm@gemini lib]$ 

Which can be explained by:

[alainm@gemini curl-7.69.1]$ find . -type f -exec egrep "define.+ntohs" {} \; -print
#  define ntohs(a)      curlx_ntohs((a))
./lib/warnless.h

I expected the following

A nice build

curl/libcurl version

https://github.com/curl/curl/releases/download/curl-7_69_1/curl-7.69.1.tar.gz

operating system

Linux gemini 3.10.0-693.2.2.el7.x86_64 #1 SMP Tue Sep 12 22:26:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

[bagder]

That BUILDING_WARNLESS_C trick was added there in b735717 for the sake of icc it seems. Does it work if you simply not define it?

[aminiussi]

Actually, I got it the other way around, it works if I define it.

[bagder]

Where do you define it then so that it works? Isn't the logic in warnless.c enough to get it defined for icc?

[bagder]

Ah, that define only works for warnless.c, while your error above is for mime.c...

[aminiussi]

I define it through the CFLAGS in the configure script. Since the defines are in the warnless.h header, it looks ok so far.
Make check failed but that was a valgrind issue.

[bagder]

But why is that BUILDING_WARNLESS_C thing needed at all?

[aminiussi]

Because without it, the

  extern uint16_t ntohs (uint16_t __netshort)

in '/usr/include/netinet/in.h' get rewritten into

  extern uint16_t curlx_htons((uint16_t __hostshort))

which is a syntax error.

Now, I've read that on some platforms. htons is a macro that triggers a problematic cast. So maybe rewriting it to curlx_htons mask the problematic cast ?

[bagder]

What happens if you remove those defines and build with this patch?

diff --git a/lib/warnless.h b/lib/warnless.h
index ea4c4395d..ab78f9448 100644
--- a/lib/warnless.h
+++ b/lib/warnless.h
@@ -92,21 +92,8 @@ void curlx_FD_ZERO(fd_set *fdset);
 
 unsigned short curlx_htons(unsigned short usnum);
 
 unsigned short curlx_ntohs(unsigned short usnum);
 
-#ifndef BUILDING_WARNLESS_C
-#  undef  FD_ISSET
-#  define FD_ISSET(a,b) curlx_FD_ISSET((a),(b))
-#  undef  FD_SET
-#  define FD_SET(a,b)   curlx_FD_SET((a),(b))
-#  undef  FD_ZERO
-#  define FD_ZERO(a)    curlx_FD_ZERO((a))
-#  undef  htons
-#  define htons(a)      curlx_htons((a))
-#  undef  ntohs
-#  define ntohs(a)      curlx_ntohs((a))
-#endif
-
 #endif /* __INTEL_COMPILER && __unix__ */
 
 #endif /* HEADER_CURL_WARNLESS_H */

[bagder]

@aminiussi we need your assistance with this issue or it will get closed. We don't have access to icc nor any CI or autobuilds using it.

[aminiussi]

@bagder sorry, I'll test test the patch in the afternoon.

[aminiussi]

Build with the patch wen ok on the last git pull.
There is just this recurring warning: icc: command line remark #10148: option '-vec-report0' not supported.

Not all test passes, but that is due to valgrind:

test 0117...sh: line 1: 130092 Illegal instruction     ../libtool --mode=execute /usr/bin/valgrind --tool=memcheck --quiet --leak-check=yes --suppressions=./valgrind.supp --num-callers=16 --log-file=log/valgrind117 ../src/curl --output log/curl117.out --include --trace-ascii log/trace117 --trace-time ftp://127.0.0.1:8992/117 > log/stdout117 2> log/stderr117
FAILED

Thx

[bagder]

-vec-report0 is added by configure with this comment "Disable vectorizer diagnostic information" and is noted "Only icc 10.0 or later". I suppose we should remove this too.

I'll cook up a proper PR with both these changes.

Test 117 has no problems with or without valgrind for others. Maybe a problem with icc and valgrind?