http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51646
Bug #: 51646
Summary: Make libgfortran compile on Android - without S_IREAD
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Keywords: build
Severity: normal
Priority: P3
Component: libfortran
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: bur...@gcc.gnu.org
CC: j...@gcc.gnu.org
Created attachment 26156
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26156
Draft patch
Janne: What do you think of the attached patch?
http://specificimpulses.blogspot.com/2011/01/my-android-speaks-fortran-yours-can-too.html
shows that gfortran can be build for on Android (= host + target).
However, Android's NDK does not support S_IREAD and S_IWRITE but only S_IRUSR
and S_IWUSR.
In the Linux man page I find:
UNIX V7 (and later systems) had S_IREAD, S_IWRITE, S_IEXEC, where POSIX
prescribes the synonyms S_IRUSR, S_IWUSR, S_IXUSR.
While POSIX (IEEE Std 1003.1, 2003) just lists the latter:
S_IRUSR
Read permission, owner.
S_IWUSR
Write permission, owner.
Expected: If no S_IREAD/S_IWRITE is available, use S_IRUSR/S_IWUSR. (Or rather
the other way round, given that only the latter is standard.)
S_IREAD/S_IWRITE is
- checked for in LIBGFOR_CHECK_UNLINK_OPEN_FILE (libgfortran/acinclude.m4)
- used in io/unix.c's id_from_fd
* * *
In the blog, the existence of other issues is mentioned and it links to a hack:
http://aeromonkey.homeip.net/public/ugly_gfortran_hacks.patch
(Google cache:
http://webcache.googleusercontent.com/search?q=cache:khmjfgpFiAIJ:aeromonkey.homeip.net/public/ugly_gfortran_hacks.patch+aeromonkey.homeip.net/public/ugly_gfortran_hacks.patch
)
However, the patch/hack does not tell me much: It disable configure checking
(as_fn_exit returns 0 ("echo $1") instead of "exit $1") and in
intrinsics/date_and_time.c the "#ifndef" has been changed into an "#ifdef" for
HAVE_LOCALTIME_R and for HAVE_GMTIME_R.
Without config.log, one can probably not deduce what went wrong.
