Hello,
I realise that m4/curl-compilers.m4 does not detecting properly HP native
compiler on my HP-UX Itanium machines. The key problem in C preprocessor
which has invoked there. On available for me machines I am using cpp, not
"cc -E" and it is not defines __HP_cc, but __hpux.
In HP manuals written:
                     NOTE: __ia64 and __HP_aCC are defined automatically for
                     aCC and __HP_cc for cc/c89/c99 or aCC with -Ae.
                     The following is the list of default -D flags:

                     -AP:
                     -D__hpux -D__ia64=1 -D_BIG_ENDIAN=1 -D__STDCPP__
                     -D__HP_aCC=version-string

                     -AA: Same as -AP, and also defines -D_HP_NAMESPACE_STD.

                     aCC -Ae:
                     -D__hpux -D__unix -D__ia64=1 -D_BIG_ENDIAN=1
                     -D__STDCPP__ -D__HP_cc=version-string -D__STDC_EXT__
                     -D_HPUX_SOURCE -D_INCLUDE_LONGLONG

                     aCC -Ae -Aa:
                     -D__hpux -D__unix -D__ia64=1 -D_BIG_ENDIAN=1
                     -D__STDCPP__ -D__HP_cc=version-string

                     aCC -Ae -Agcc: -D_HP_GNUC_COMPATIBLE

                     aCC -Ag++: -D_HP_GNUG_COMPATIBLE

                     aCC -Aarm: -D_HP_ARM_COMPATIBLE

                     cc -Ae:
                     -D__hpux -D__unix -D__ia64=1 -D_BIG_ENDIAN=1
                     -D__HP_cc=version-string -D__STDC_EXT__ -D_HPUX_SOURCE
                     -D_INCLUDE_LONGLONG

                     cc/c89/c99 -Aa:
                     -D__hpux -D__unix -D__ia64=1 -D_BIG_ENDIAN=1
                     -D__HP_cc=version-string

                     cc -Agcc: -D_HP_GNUC_COMPATIBLE
So I see here define __hpux comes in conjunction with define __HP_cc in
native C compiler.

In HP man pages for cpp:
"All HP-UX systems have the symbols PWB, hpux, unix, _PWB, __hpux, and
__unix defined." (
http://h20565.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c02254535).

Actually it is not a problem at all to build cURL on HP-UX, but for sanity
I suggest this patch. It works with define __hpux like as __HP_cc for
detecting is it native HP compiler.

Cheers, Dmitriy

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