On 12/11/2016 01:28 PM, Rainer Orth wrote:
Hi Sandra,
PR 16519 notes that -pthread has only ever been documented as an RS6000 and
Solaris 2 option. In fact it's supported by most/all(?) POSIX-flavored
targets, including GNU/Linux, BSD variants, Darwin, etc. It's probably best
to document it as a generic option, with the expectation that GCC supports
-pthread if the underlying operating system or C library provides an
implementation of the POSIX threads API.
After scratching my head about it, it seemed that it's best categorized as
a linker option even though it also affects the preprocessor on some
targets. I'll wait a day or two before committing the attached patch, in
case anybody wants to argue that this is the wrong way to categorize it.
I don't like categorizing it as a linker option: as you say, it affects
the preprocessor as well (adding -D_REENTRANT on most systems), and in
the past (not completely sure about the present) there were subtle bugs
if you forgot to add -pthread during compilation.
Do you have a suggestion for a better place to put it? Preferably *one*
place, instead of duplicating the docs in 10+ places with
target-specific options?
-Sandra
