Re: "errno" not set in case of "libm" functions (HPUX)

Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
> So the default is indeed non-standard. But I wonder if we should use -Aa
> instead?

Probably not; at least on older HPUX versions, -Aa turns off access to
assorted stuff that we do want, eg "long long". "man cc" on my box
saith

-Amode Specify the compilation standard to be used by the
compiler. mode can be one of the following letters:

c (Default) Compile in a mode compatible with
HP-UX releases prior to 7.0. (See The C
Programming Language, First Edition by
Kernighan and Ritchie). This option also
defines the symbol _HPUX_SOURCE and allows the
user to access macros and typedefs provided by
the HPUX Operating System. The default
compilation mode may change in future releases.

a Compile under ANSI mode (ANSI programming
language C standard ISO 9899:1990). When
compiling under ANSI mode, the header files
would define only those names (macros and
typedefs) specified by the Standard. To access
macros and typedefs that are not defined by the
ANSI Standard but are provided by the HPUX
Operating System, define the symbol
_HPUX_SOURCE; or use the extension option
described below.

e Extended ANSI mode. Same as -Aa -D_HPUX_SOURCE
+e. This would define the names (macros and
typedefs) provided by the HPUX Operating System
and, in addition, allow the following
extensions: $ characters in identifier names,
sized enums, sized bit-fields, and 64-bit
integral type long long. Additional extensions
may be added to this option in the future.

The +e option is elsewhere stated to mean

+e Enables HP value-added features while compiling
in ANSI C mode, -Aa. This option is ignored
with -Ac because these features are already
provided. Features enabled:

o Long pointers
o Integral type specifiers can appear in
enum declarations.
o The $ character can appear in
identifier names.
o Missing parameters on intrinsic calls

which isn't 100% consistent with what it says under -Ae, so maybe some
additional experimentation is called for. But anyway, autoconf appears
to think that -Ae is preferable to the combination -Aa -D_HPUX_SOURCE
(that choice is coming from autoconf not our own code); so I'm not
optimistic that we can get more-standard behavior by overriding that.

regards, tom lane