diff options
| author | Roger Sayle <roger@eyesopen.com> | 2005-05-23 03:20:19 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2005-05-23 03:20:19 +0000 |
| commit | ec8a19405ee6c3ba3fc17648eae8c56e04ad490a (patch) | |
| tree | b0bd2fde5b77a11728b084f15ca7d794d9b4a845 | |
| parent | c5fbb0fc2d40da5153963a4e254adda27920a6e9 (diff) | |
| download | gcc-ec8a19405ee6c3ba3fc17648eae8c56e04ad490a.zip gcc-ec8a19405ee6c3ba3fc17648eae8c56e04ad490a.tar.gz gcc-ec8a19405ee6c3ba3fc17648eae8c56e04ad490a.tar.bz2 | |
* gfortran.texi: Document some more GNU extensions.
From-SVN: r100074
| -rw-r--r-- | gcc/fortran/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/fortran/gfortran.texi | 66 |
2 files changed, 70 insertions, 0 deletions
diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog index 09b4ab0..711cb74 100644 --- a/gcc/fortran/ChangeLog +++ b/gcc/fortran/ChangeLog @@ -1,3 +1,7 @@ +2005-05-22 Roger Sayle <roger@eyesopen.com> + + * gfortran.texi: Document some more GNU extensions. + 2005-05-22 Francois-Xavier Coudert <coudert@clipper.ens.fr> * error.c (gfc_warning): Fix typo in comment. diff --git a/gcc/fortran/gfortran.texi b/gcc/fortran/gfortran.texi index 67867bc..2644e40 100644 --- a/gcc/fortran/gfortran.texi +++ b/gcc/fortran/gfortran.texi @@ -624,6 +624,12 @@ meaning. * Old-style kind specifications:: * Old-style variable initialization:: * Extensions to namelist:: +* X format descriptor:: +* Commas in FORMAT specifications:: +* I/O item lists:: +* Hexadecimal constants:: +* Real array indices:: +* Unary operators:: @end menu @node Old-style kind specifications @@ -720,6 +726,66 @@ had been called: To aid this dialog, when input is from stdin, errors produce send their messages to stderr and execution continues, even if IOSTAT is set. +@node X format descriptor +@section X format descriptor +@cindex X format descriptor + +To support legacy codes, @command{gfortran} permits the count field +of the X edit descriptor in FORMAT statements to be omitted. When +omitted, the count is implicitly assumed to be one. + +@smallexample + PRINT 10, 2, 3 +10 FORMAT (I1, X, I1) +@end smallexample + +@node Commas in FORMAT specifications +@section Commas in FORMAT specifications +@cindex Commas in FORMAT specifications + +To support legacy codes, @command{gfortran} allows the comma separator +to be omitted immediately before and after character string edit +descriptors in FORMAT statements. + +@smallexample + PRINT 10, 2, 3 +10 FORMAT ('FOO='I1' BAR='I2) +@end smallexample + +@node I/O item lists +@section I/O item lists +@cindex I/O item lists + +To support legacy codes, @command{gfortran} allows the input item list +of the READ statement, and the output item lists of the WRITE and PRINT +statements to start with a comma. + +@node Hexadecimal constants +@section Hexadecimal constants +@cindex Hexadecimal constants + +As a GNU extension, @command{gfortran} allows hexadecimal constants to +be specified using the X prefix, in addition to the standard Z prefix. + +@node Real array indices +@section Real array indices +@cindex Real array indices + +As a GNU extension, @command{gfortran} allows arrays to be indexed using +real types, whose values are implicitly converted to integers. + +@node Unary operators +@section Unary operators +@cindex Unary operators + +As a GNU extension, @command{gfortran} allows unary plus and unary +minus operators to appear as the second operand of binary arithmetic +operators without the need for parenthesis. + +@smallexample + X = Y * -Z +@end smallexample + @include intrinsic.texi @c --------------------------------------------------------------------- @c Contributing |