On 24.05.2011 20:44, Tom Lane wrote:
BTW, is it really true that HP decided they could make the compiler's default behavior violate the C standard so flagrantly? I could believe offering a switch that you had to specify to save a few cycles at the cost of nonstandard behavior; but if your report is actually correct, their engineering standards have gone way downhill since I worked there. I wonder whether you are inserting some other nonstandard switch that turns on this effect.
This (http://docs.hp.com/en/B3901-90015/ch02s07.html) says:
+O[no]libmerrno Description: This option enables[disables] support for errno in libm functions. The default is +Onolibmerrno. In C++ C-mode, the default is +Olibmerrno with -Aa option.
So the default is indeed non-standard. But I wonder if we should use -Aa instead? The documentation I found for -Aa (http://docs.hp.com/en/B3901-90017/ch02s22.html) says:
-Aa The -Aa option instructs the compiler to use Koenig lookup and strict ANSI for scope rules. This option is equivalent to specifying -Wc,-koenig_lookup,on and -Wc,-ansi_for_scope,on. The default is off. Refer to -Ae option for C++ C-mode description. The standard features enabled by -Aa are incompatible with earlier C and C++ features.
That sounds like what we want. Apparently that description is not complete, and -Aa changes some other behavior to ANSI C compatible as well, like +Olibmerrno. There's also -AC99, which specifies compiling in C99-mode - I wonder if that sets +Olibmerrno too.
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