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Fix PR gdb/23558: Use system's 'getcwd' when cross-compiling GDB 

This is a backport of a gnulib fix for the following bug:

  https://sourceware.org/bugzilla/show_bug.cgi?id=23558

The problem reported there is about the replacement of 'getcwd' when
cross-compiling GDB.  With our current gnulib copy, the mechanism for
deciding whether to use the system's 'getcwd' or gnulib's version is
too simplistic and pessimistic, so when cross-compiling we always end
up using gnulib's version, which has a limitation: it cannot handle
the situation when the parent directory doesn't have read permissions.

The solution is to backport the following gnulib commit:

  commit a96d2e67052c879b1bcc5bc461722beac75fc372
  Author: Bruno Haible <bruno@clisp.org>
  Date:   Thu Aug 23 21:13:19 2018 +0200

      getcwd: Add cross-compilation guesses.

gdb/ChangeLog:
2018-09-10  Sergio Durigan Junior  <sergiodj@redhat.com>

	PR gdb/23555
	PR gdb/23558
	* gnulib/import/m4/getcwd-path-max.m4: Add cross-compilation
	guesses.
This commit is contained in:
Sergio Durigan Junior 2018-09-10 12:52:04 -04:00
parent 5e8754f90a
commit e2fc52e745
2 changed files with 23 additions and 4 deletions
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7
gdb/ChangeLog
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@ -1,3 +1,10 @@
2018-09-10 Sergio Durigan Junior <sergiodj@redhat.com>
PR gdb/23555
PR gdb/23558
* gnulib/import/m4/getcwd-path-max.m4: Add cross-compilation
guesses.
2018-09-10 Sergio Durigan Junior <sergiodj@redhat.com>
Revert:

20
gdb/gnulib/import/m4/getcwd-path-max.m4
View File

@ -209,9 +209,21 @@ main ()
32) gl_cv_func_getcwd_path_max='yes, but with shorter paths';;
*) gl_cv_func_getcwd_path_max=no;;
esac],
[case "$host_os" in
aix*) gl_cv_func_getcwd_path_max='no, it has the AIX bug';;
*) gl_cv_func_getcwd_path_max=no;;
esac])
[# Cross-compilation guesses:
case "$host_os" in
aix*) # On AIX, it has the AIX bug.
gl_cv_func_getcwd_path_max='no, it has the AIX bug' ;;
gnu*) # On Hurd, it is 'yes'.
gl_cv_func_getcwd_path_max=yes ;;
linux* | kfreebsd*)
# On older Linux+glibc it's 'no, but it is partly working',
# on newer Linux+glibc it's 'yes'.
# On Linux+musl libc, it's 'no, but it is partly working'.
# On kFreeBSD+glibc, it's 'no, but it is partly working'.
gl_cv_func_getcwd_path_max='no, but it is partly working' ;;
*) # If we don't know, assume the worst.
gl_cv_func_getcwd_path_max=no ;;
esac
])
])
])