the mainline, development version of `g77' within `egcs') is available
at `http://egcs.cygnus.com/onlinedocs/g77_news.html'.
- The following information was last updated on 1999-04-20:
+ The following information was last updated on 1999-04-23:
In `egcs' 1.2 (versus 1.1.2):
=============================
4. The `-ax' option is now obeyed when compiling Fortran programs.
(It is passed to the `f771' driver.)
+ * The new `-fsubscript-check' option causes `g77' to compile
+ run-time bounds checks of array subscripts, as well as of
+ substring start and end points.
+
+ The current implementation uses the `libf2c' library routine
+ `s_rnge' to print the diagnostic. Since a future version of `g77'
+ might use a different implementation, use the new
+ `-ff2c-subscript-check' option if your application requires use of
+ `s_rnge' or a compile-time diagnostic.
+
* Source file names with the suffixes `.FOR' and `.FPP' now are
recognized by `g77' as if they ended in `.for' and `.fpp',
respectively.
* The `-malign-double' option now reliably aligns *all*
double-precision variables and arrays on Intel x86 targets.
- * Even without the `-malign-double' option, `g77' reliably aligns
+ 6. Even without the `-malign-double' option, `g77' reliably aligns
local double-precision variables that are not in `EQUIVALENCE'
areas and not `SAVE''d.
- * A substantial portion of the `g77' front end's code-generation
+ 7. A substantial portion of the `g77' front end's code-generation
component was rewritten. It now generates code using facilities
more robustly supported by the `gcc' back end. One effect of this
rewrite is that some codes no longer produce a spurious "label LAB
* Support for the `-fugly' option has been removed.
- 6. Improve documentation and indexing, including information on Year
+ 8. Improve documentation and indexing, including information on Year
2000 (Y2K) compliance, and providing more information on internals
of the front end.
- 7. Upgrade to `libf2c' as of 1999-03-17.
+ 9. Upgrade to `libf2c' as of 1999-03-17.
In 0.5.24 and `egcs' 1.1.2 (versus 0.5.23 and 1.1.1):
=====================================================
In `egcs' 1.1 (versus 0.5.24):
==============================
- 8. Fix `g77' crash compiling code containing the construct
+ 10. Fix `g77' crash compiling code containing the construct
`CMPLX(0.)' or similar.
- 9. Fix `g77' crash (or apparently infinite run-time) when compiling
+ 11. Fix `g77' crash (or apparently infinite run-time) when compiling
certain complicated expressions involving `COMPLEX' arithmetic
(especially multiplication).
- 10. Fix a code-generation bug that afflicted Intel x86 targets when
+ 12. Fix a code-generation bug that afflicted Intel x86 targets when
`-O2' was specified compiling, for example, an old version of the
`DNRM2' routine.
In `egcs' 1.1 (versus `egcs' 1.0.3):
====================================
- 11. Fix bugs in the `libU77' intrinsic `HostNm' that wrote one byte
+ 13. Fix bugs in the `libU77' intrinsic `HostNm' that wrote one byte
beyond the end of its `CHARACTER' argument, and in the `libU77'
intrinsics `GMTime' and `LTime' that overwrote their arguments.
- 12. Assumed arrays with negative bounds (such as `REAL A(-1:*)') no
+ 14. Assumed arrays with negative bounds (such as `REAL A(-1:*)') no
longer elicit spurious diagnostics from `g77', even on systems
with pointers having different sizes than integers.
This bug is not known to have existed in any recent version of
`gcc'. It was introduced in an early release of `egcs'.
- 13. Valid combinations of `EXTERNAL', passing that external as a dummy
+ 15. Valid combinations of `EXTERNAL', passing that external as a dummy
argument without explicitly giving it a type, and, in a subsequent
program unit, referencing that external as an external function
with a different type no longer crash `g77'.
- 14. `CASE DEFAULT' no longer crashes `g77'.
+ 16. `CASE DEFAULT' no longer crashes `g77'.
- 15. The `-Wunused' option no longer issues a spurious warning about
+ 17. The `-Wunused' option no longer issues a spurious warning about
the "master" procedure generated by `g77' for procedures
containing `ENTRY' statements.
`libf2c' environment, even when `libf2c' (now `libg2c') is a
shared library.
- 16. `g77' no longer installs the `f77' command and `f77.1' man page in
+ 18. `g77' no longer installs the `f77' command and `f77.1' man page in
the `/usr' or `/usr/local' heirarchy, even if the `f77-install-ok'
file exists in the source or build directory. See the
installation documentation for more information.
- 17. `g77' no longer installs the `libf2c.a' library and `f2c.h'
+ 19. `g77' no longer installs the `libf2c.a' library and `f2c.h'
include file in the `/usr' or `/usr/local' heirarchy, even if the
`f2c-install-ok' or `f2c-exists-ok' files exist in the source or
build directory. See the installation documentation for more
information.
- 18. The `libf2c.a' library produced by `g77' has been renamed to
+ 20. The `libf2c.a' library produced by `g77' has been renamed to
`libg2c.a'. It is installed only in the `gcc' "private" directory
heirarchy, `gcc-lib'. This allows system administrators and users
to choose which version of the `libf2c' library from `netlib' they
wish to use on a case-by-case basis. See the installation
documentation for more information.
- 19. The `f2c.h' include (header) file produced by `g77' has been
+ 21. The `f2c.h' include (header) file produced by `g77' has been
renamed to `g2c.h'. It is installed only in the `gcc' "private"
directory heirarchy, `gcc-lib'. This allows system administrators
and users to choose which version of the include file from
than the one built and installed as part of the same `g77' version
is picked up.
- 20. During the configuration and build process, `g77' creates
+ 22. During the configuration and build process, `g77' creates
subdirectories it needs only as it needs them. Other cleaning up
of the configuration and build process has been performed as well.
- 21. `install-info' now used to update the directory of Info
+ 23. `install-info' now used to update the directory of Info
documentation to contain an entry for `g77' (during installation).
* Some diagnostics have been changed from warnings to errors, to
in the `OPEN', `INQUIRE', `READ', and `WRITE' statements, and
about truncations of various sorts of constants.
- 22. Improve compilation of `FORMAT' expressions so that a null byte is
+ 24. Improve compilation of `FORMAT' expressions so that a null byte is
appended to the last operand if it is a constant. This provides a
cleaner run-time diagnostic as provided by `libf2c' for statements
like `PRINT '(I1', 42'.
- 23. Improve documentation and indexing.
+ 25. Improve documentation and indexing.
- 24. The upgrade to `libf2c' as of 1998-06-18 should fix a variety of
+ 26. The upgrade to `libf2c' as of 1998-06-18 should fix a variety of
problems, including those involving some uses of the `T' format
specifier, and perhaps some build (porting) problems as well.
In 0.5.24 and `egcs' 1.1 (versus 0.5.23):
=========================================
- 25. `g77' no longer produces incorrect code and initial values for
+ 27. `g77' no longer produces incorrect code and initial values for
`EQUIVALENCE' and `COMMON' aggregates that, due to "unnatural"
ordering of members vis-a-vis their types, require initial padding.
- 26. `g77' no longer crashes when compiling code containing
+ 28. `g77' no longer crashes when compiling code containing
specification statements such as `INTEGER(KIND=7) PTR'.
- 27. `g77' no longer crashes when compiling code such as `J = SIGNAL(1,
+ 29. `g77' no longer crashes when compiling code such as `J = SIGNAL(1,
2)'.
* `g77' now treats `%LOC(EXPR)' and `LOC(EXPR)' as "ordinary"
* The F90 `System_Clock' intrinsic allows the optional arguments
(except for the `Count' argument) to be omitted.
- 28. Upgrade to `libf2c' as of 1998-06-18.
+ 30. Upgrade to `libf2c' as of 1998-06-18.
- 29. Improve documentation and indexing.
+ 31. Improve documentation and indexing.
In previous versions:
=====================
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