https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69473
Bug ID: 69473
Summary: system identification macros not documented
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
Bug 28314 points out that while the __linux macro is defined on the
i?86-*-linux* target it is not defined on powerpc*-*-linux*. In the
discussion of the bug it was noted that neither this macro, nor any of the
other Linux identification macros, is documented in the GCC manual and thus
shouldn't be relied on by programs.
However, since GCC exposes the macro to users and since it is obviously relied
on by many programs, it should be documented in the GCC manual, along with all
other system identification macros (such as _AIX for example) that GCC defines.
This bug is a request to add such documentation. While the GCC sources (and
tests such as gcc/testsuite/gcc.dg/cpp/assert4.c) should serve as the basis of
the documentation, the following site is a useful collection of such macros
that can be used for reference:
http://sourceforge.net/p/predef/wiki/OperatingSystems/
