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gcc-2.95.3 Linux下最常用的C编译器

     being returned as 100 in the year 2000.

   * Fix the `Date_and_Time' intrinsic (in `libg2c') to return the
     milliseconds value properly in VALUES(8).

   * Fix the `LStat' intrinsic (in `libg2c') to return device-ID
     information properly in SARRAY(7).

   * Improve documentation.

In `EGCS' 1.1.1 versus `EGCS' 1.1:
==================================

   * Fix `libg2c' so it performs an implicit `ENDFILE' operation (as
     appropriate) whenever a `REWIND' is done.

     (This bug was introduced in 0.5.23 and `egcs' 1.1 in `g77''s
     version of `libf2c'.)

   * Fix `libg2c' so it no longer crashes with a spurious diagnostic
     upon doing any I/O following a direct formatted write.

     (This bug was introduced in 0.5.23 and `egcs' 1.1 in `g77''s
     version of `libf2c'.)

   * Fix `g77' so it no longer crashes compiling references to the
     `Rand' intrinsic on some systems.

   * Fix `g77' portion of installation process so it works better on
     some systems (those with shells requiring `else true' clauses on
     `if' constructs for the completion code to be set properly).

In `EGCS' 1.1 versus `EGCS' 1.0.3:
==================================

 18. 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.

 19. 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'.

 20. 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'.

 21. `CASE DEFAULT' no longer crashes `g77'.

 22. The `-Wunused' option no longer issues a spurious warning about
     the "master" procedure generated by `g77' for procedures
     containing `ENTRY' statements.

   * Support `FORMAT(I<EXPR>)' when EXPR is a compile-time constant
     `INTEGER' expression.

   * Fix `g77' `-g' option so procedures that use `ENTRY' can be
     stepped through, line by line, in `gdb'.

   * Allow any `REAL' argument to intrinsics `Second' and `CPU_Time'.

   * Use `tempnam', if available, to open scratch files (as in
     `OPEN(STATUS='SCRATCH')') so that the `TMPDIR' environment
     variable, if present, is used.

   * `g77''s version of `libf2c' separates out the setting of global
     state (such as command-line arguments and signal handling) from
     `main.o' into distinct, new library archive members.

     This should make it easier to write portable applications that
     have their own (non-Fortran) `main()' routine properly set up the
     `libf2c' environment, even when `libf2c' (now `libg2c') is a
     shared library.

 23. `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.

 24. `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.

 25. 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.

 26. 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
     `netlib' they wish to use on a case-by-case basis.  See the
     installation documentation for more information.

   * The `g77' command now expects the run-time library to be named
     `libg2c.a' instead of `libf2c.a', to ensure that a version other
     than the one built and installed as part of the same `g77' version
     is picked up.

 27. 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.

 28. `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
     prevent inadvertent use of the resulting, probably buggy, programs.
     These mostly include diagnostics about use of unsupported features
     in the `OPEN', `INQUIRE', `READ', and `WRITE' statements, and
     about truncations of various sorts of constants.

 29. 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'.

 30. Improve documentation and indexing.

 31. 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 `EGCS' 1.1 versus `g77' 0.5.23:
==================================

 32. Fix a code-generation bug that afflicted Intel x86 targets when
     `-O2' was specified compiling, for example, an old version of the
     `DNRM2' routine.

     The x87 coprocessor stack was being mismanaged in cases involving
     assigned `GOTO' and `ASSIGN'.

 33. `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.

 34. Fix `g77' crash compiling code containing the construct
     `CMPLX(0.)' or similar.

 35. `g77' no longer crashes when compiling code containing
     specification statements such as `INTEGER(KIND=7) PTR'.

 36. `g77' no longer crashes when compiling code such as `J = SIGNAL(1,
     2)'.

   * `g77' now treats `%LOC(EXPR)' and `LOC(EXPR)' as "ordinary"
     expressions when they are used as arguments in procedure calls.
     This change applies only to global (filewide) analysis, making it
     consistent with how `g77' actually generates code for these cases.

     Previously, `g77' treated these expressions as denoting special
     "pointer" arguments for the purposes of filewide analysis.

 37. Fix `g77' crash (or apparently infinite run-time) when compiling
     certain complicated expressions involving `COMPLEX' arithmetic
     (especially multiplication).

   * Align static double-precision variables and arrays on Intel x86
     targets regardless of whether `-malign-double' is specified.

     Generally, this affects only local variables and arrays having the
     `SAVE' attribute or given initial values via `DATA'.

   * The `g77' driver now ensures that `-lg2c' is specified in the link
     phase prior to any occurrence of `-lm'.  This prevents
     accidentally linking to a routine in the SunOS4 `-lm' library when
     the generated code wants to link to the one in `libf2c' (`libg2c').

   * `g77' emits more debugging information when `-g' is used.

     This new information allows, for example, `which __g77_length_a'
     to be used in `gdb' to determine the type of the phantom length
     argument supplied with `CHARACTER' variables.

     This information pertains to internally-generated type, variable,
     and other information, not to the longstanding deficiencies
     vis-a-vis `COMMON' and `EQUIVALENCE'.

   * The F90 `Date_and_Time' intrinsic now is supported.

   * The F90 `System_Clock' intrinsic allows the optional arguments
     (except for the `Count' argument) to be omitted.

 38. Upgrade to `libf2c' as of 1998-06-18.

 39. Improve documentation and indexing.

In previous versions:
=====================

   Information on previous versions is not provided in this
`egcs/gcc/f/NEWS' file, to keep it short.  See `egcs/gcc/f/news.texi',
or any of its other derivations (Info, HTML, dvi forms) for such
information.