Fix handling of temporary files.

2012-05-05  Janne Blomqvist  <jb@gcc.gnu.org>

        * gfortran.texi (GFORTRAN_TMPDIR): Rename to TMPDIR, explain
        algorithm for choosing temp directory.


2012-05-05  Janne Blomqvist  <jb@gcc.gnu.org>

        * config.h.in: Regenerated.
        * configure: Regenerated.
        * configure.ac: Add checks for getegid and __secure_getenv.
        * io/unix.c (P_tmpdir): Fallback definition for macro.
        (tempfile_open): New function.
        (tempfile): Use secure_getenv, call tempfile_open to try each
        directory in turn.
        * libgfortran.h (DEFAULT_TMPDIR): Remove macro.
        (secure_getenv): New macro/prototype.
        * runtime/environ.c (secure_getenv): New function.
        (variable_table): Rename GFORTRAN_TMPDIR to TMPDIR.
        * runtime/main.c (find_addr2line): Use secure_getenv.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@187190 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 22 insertions, 9 deletions

diff --git a/gcc/fortran/gfortran.texi b/gcc/fortran/gfortran.texi
index b1790c6ad5f..96662c49423 100644
--- a/gcc/fortran/gfortran.texi
+++ b/gcc/fortran/gfortran.texi
@@ -576,10 +576,10 @@ environment variables.
 Malformed environment variables are silently ignored.
 
 @menu
+* TMPDIR:: Directory for scratch files
 * GFORTRAN_STDIN_UNIT:: Unit number for standard input
 * GFORTRAN_STDOUT_UNIT:: Unit number for standard output
 * GFORTRAN_STDERR_UNIT:: Unit number for standard error
-* GFORTRAN_TMPDIR:: Directory for scratch files
 * GFORTRAN_UNBUFFERED_ALL:: Do not buffer I/O for all units.
 * GFORTRAN_UNBUFFERED_PRECONNECTED:: Do not buffer I/O for preconnected units.
 * GFORTRAN_SHOW_LOCUS::  Show location for runtime errors
@@ -590,6 +590,27 @@ Malformed environment variables are silently ignored.
 * GFORTRAN_ERROR_BACKTRACE:: Show backtrace on run-time errors
 @end menu
 
+@node TMPDIR
+@section @env{TMPDIR}---Directory for scratch files
+
+When opening a file with @code{STATUS='SCRATCH'}, GNU Fortran tries to
+create the file in one of the potential directories by testing each
+directory in the order below.
+
+@enumerate
+@item
+The environment variable @env{TMPDIR}, if it exists.
+
+@item
+On the MinGW target, the directory returned by the @code{GetTempPath}
+function. Alternatively, on the Cygwin target, the @env{TMP} and
+@env{TEMP} environment variables, if they exist, in that order.
+
+@item
+The @code{P_tmpdir} macro if it is defined, otherwise the directory
+@file{/tmp}.
+@end enumerate
+
 @node GFORTRAN_STDIN_UNIT
 @section @env{GFORTRAN_STDIN_UNIT}---Unit number for standard input
 
@@ -611,14 +632,6 @@ This environment variable can be used to select the unit number
 preconnected to standard error.  This must be a positive integer.
 The default value is 0.
 
-@node GFORTRAN_TMPDIR
-@section @env{GFORTRAN_TMPDIR}---Directory for scratch files
-
-This environment variable controls where scratch files are
-created.  If this environment variable is missing,
-GNU Fortran searches for the environment variable @env{TMP}, then @env{TEMP}.
-If these are missing, the default is @file{/tmp}.
-
 @node GFORTRAN_UNBUFFERED_ALL
 @section @env{GFORTRAN_UNBUFFERED_ALL}---Do not buffer I/O on all units