Re: gnulib unsetenv/environ compile failure in hp-ux

[Bruno Haible]

address@hidden wrote:
> The compile fails with 
> 
>  cc -DHAVE_CONFIG_H -I. -I.. ... -g -z +O2 -c unsetenv.c  +Z -DPIC -o 
> .libs/unsetenv.o
> cc: "unsetenv.c", line 67: error 1588: "environ" undefined.

This fails because this command line does not include the option -Ae or
-D_HPUX_SOURCE. One of these options is necessary, otherwise the HP-UX
/usr/include/*.h files lack many POSIX declarations. In particular the one
of 'environ'.

The INSTALL file in gnulib recommends that for HP-UX cc not only the option
"-Ae" but also "-D_XOPEN_SOURCE=500" should be used.

> configure:27297: checking if environ is properly declared
> configure:27325: cc -c -g -z +O2 -Ae -Wp,-H32768 ... conftest.c >&5
> cc: "conftest.c", line 41: error 1584: Inconsistent type declaration: 
> "environ".
> cc: "conftest.c", line 45: error 1529: Cannot select field of non-structure.

Here the 'environ' declaration is visible because "-Ae" is part of the command
line.

Maybe you have passed -Ae not as part of the CC variable but as part of CFLAGS
or CPPFLAGS, and a particular Makefile rule ignores CFLAGS and CPPFLAGS.
(Unlikely because the Makefile rules were generated by automake.) Or maybe
you have overridden CFLAGS and/or CPPFLAGS somewhere? You shouldn't do that.
Automake provides variables AM_CFLAGS and AM_CPPFLAGS that you can override
instead.

Bruno