diff options
author | Craig Burley <burley@gnu.org> | 1998-09-01 03:13:21 -0600 |
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committer | Jeff Law <law@gcc.gnu.org> | 1998-09-01 03:13:21 -0600 |
commit | aafb55f64046cd09fbab560a597cc591bdfedac1 (patch) | |
tree | d18090729fb7b83d4718929fd26446e4887ae61c /gcc/f/g77.texi | |
parent | b51e57aa2dd7d52373ade557d47b2afe3e7f9675 (diff) | |
download | gcc-aafb55f64046cd09fbab560a597cc591bdfedac1.zip gcc-aafb55f64046cd09fbab560a597cc591bdfedac1.tar.gz gcc-aafb55f64046cd09fbab560a597cc591bdfedac1.tar.bz2 |
bugs.texi, [...]: Doc updates from Craig.
* bugs.texi, g77.1, g77.texi, intdoc.in, news.texi: Doc updates
from Craig.
From-SVN: r22152
Diffstat (limited to 'gcc/f/g77.texi')
-rw-r--r-- | gcc/f/g77.texi | 190 |
1 files changed, 174 insertions, 16 deletions
diff --git a/gcc/f/g77.texi b/gcc/f/g77.texi index b69fde8..f335961 100644 --- a/gcc/f/g77.texi +++ b/gcc/f/g77.texi @@ -14,7 +14,7 @@ @c %**start of header @setfilename g77.info -@set last-up-date 1998-08-23 +@set last-up-date 1998-09-01 @set version-g77 0.5.24 @set email-general egcs@@cygnus.com @set email-bugs egcs-bugs@@cygnus.com @@ -3310,7 +3310,71 @@ or, if you cannot do that, email @email{fortran@@gnu.org} asking for a recent copy of the GNU Fortran @file{.plan} file. -@heading In @code{egcs} 1.1: +@heading In @code{egcs} 1.1 (versus 0.5.24): +@itemize @bullet +@cindex alignment +@cindex double-precision performance +@cindex -malign-double +@item +Align static double-precision variables and arrays +on Intel x86 targets +regardless of whether @samp{-malign-double} is specified. + +Generally, this affects only local variables and arrays +having the @code{SAVE} attribute +or given initial values via @code{DATA}. +@end itemize + +@heading In @code{egcs} 1.1 (versus @code{egcs} 1.0.3): +@itemize @bullet +@item +Support @samp{FORMAT(I<@var{expr}>)} when @var{expr} is a +compile-time constant @code{INTEGER} expression. + +@item +Fix @code{g77} @samp{-g} option so procedures that +use @samp{ENTRY} can be stepped through, line by line, +in @code{gdb}. + +@item +Allow any @code{REAL} argument to intrinsics +@code{Second} and @code{CPU_Time}. + +@item +Use @code{tempnam}, if available, to open scratch files +(as in @samp{OPEN(STATUS='SCRATCH')}) +so that the @code{TMPDIR} environment variable, +if present, is used. + +@item +@code{g77}'s version of @code{libf2c} separates out +the setting of global state +(such as command-line arguments and signal handling) +from @file{main.o} into distinct, new library +archive members. + +This should make it easier to write portable applications +that have their own (non-Fortran) @code{main()} routine +properly set up the @code{libf2c} environment, even +when @code{libf2c} (now @code{libg2c}) is a shared library. + +@item +The @code{g77} command now expects the run-time library +to be named @code{libg2c.a} instead of @code{libf2c.a}, +to ensure that a version other than the one built and +installed as part of the same @code{g77} version is picked up. + +@item +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 @code{OPEN}, @code{INQUIRE}, @code{READ}, and +@code{WRITE} statements, +and about truncations of various sorts of constants. +@end itemize + +@heading In 0.5.24 and @code{egcs} 1.1 (versus 0.5.23): @itemize @bullet @item @code{g77} now treats @samp{%LOC(@var{expr})} and @@ -3335,16 +3399,27 @@ when the generated code wants to link to the one in @code{libf2c} (@code{libg2c}). @item -The F90 @samp{DATE_AND_TIME} intrinsic now is +@code{g77} emits more debugging information when +@samp{-g} is used. + +This new information allows, for example, +@kbd{which __g77_length_a} to be used in @code{gdb} +to determine the type of the phantom length argument +supplied with @samp{CHARACTER} variables. + +This information pertains to internally-generated +type, variable, and other information, +not to the longstanding deficiencies vis-a-vis +@samp{COMMON} and @samp{EQUIVALENCE}. + +@item +The F90 @samp{Date_and_Time} intrinsic now is supported. @item -The F90 @samp{SYSTEM_CLOCK} intrinsic allows +The F90 @samp{System_Clock} intrinsic allows the optional arguments (except for the @samp{Count} argument) to be omitted. - -@item -Upgrade to @code{libf2c} as of 1998-06-18. @end itemize @heading In 0.5.23: @@ -3373,7 +3448,7 @@ the options @samp{-fargument-alias}, @samp{-fargument-noalias}, and @samp{-fargument-noalias-global}, and the corresponding alias-analysis code. -(Version 1.0.1 of @code{egcs} has the alias-analysis +(@code{egcs} has the alias-analysis code, but not the @code{__restrict__} keyword. @code{egcs} @code{g77} users benefit from the alias-analysis code despite the lack of the @code{__restrict__} keyword, @@ -3385,7 +3460,7 @@ Support for the GNU compiler options @samp{-freduce-all-givs}, and @samp{-frerun-loop-opt}. -(Version 1.0.1 of @code{egcs} supports these options. +(@code{egcs} supports these options. @code{g77} users of @code{egcs} benefit from them even if they are not explicitly specified, because the defaults are optimized for @code{g77} users.) @@ -3443,7 +3518,7 @@ and about truncations of various sorts of constants. @heading In 0.5.22: @itemize @bullet @item -Fix @code{SIGNAL} intrinsic so it offers portable +Fix @code{Signal} intrinsic so it offers portable support for 64-bit systems (such as Digital Alphas running GNU/Linux). @@ -3466,7 +3541,7 @@ Allow any numeric argument to intrinsics @item Use @code{tempnam}, if available, to open scratch files -(as in @samp{OPEN(STATUS='SCRATCH')} +(as in @samp{OPEN(STATUS='SCRATCH')}) so that the @code{TMPDIR} environment variable, if present, is used. @@ -3488,6 +3563,61 @@ Fix compiler so it accepts @samp{-fgnu-intrinsics-*} and @samp{-fbadu77-intrinsics-*} options. @end itemize +@heading In @code{egcs} 1.0.2 (versus @code{egcs} 1.0.1): +@itemize @bullet +@item +Fix compiler so it accepts @samp{-fgnu-intrinsics-*} and +@samp{-fbadu77-intrinsics-*} options. +@end itemize + +@heading In @code{egcs} 1.0 (versus 0.5.21): +@itemize @bullet +@item +Version 1.0 of @code{egcs} +contains several regressions against +version 0.5.21 of @code{g77}, +due to using the +``vanilla'' @code{gcc} back end instead of patching +it to fix a few bugs and improve performance in a +few cases. + +@xref{Actual Bugs,,Actual Bugs We Haven't Fixed Yet}, +available in plain-text format in @code{gcc/f/BUGS}, +for information on the known bugs in this version, +including the regressions. + +Features that have been dropped from this version +of @code{g77} due to their being implemented +via @code{g77}-specific patches to the @code{gcc} +back end in previous releases include: + +@itemize -- +@item +Support for the C-language @code{restrict} keyword. + +@item +Support for the @samp{-W} option warning about +integer division by zero. + +@item +The Intel x86-specific option @samp{-malign-double} +applying to stack-allocated data +as well as statically-allocate data. +@end itemize + +@cindex -@w{}-driver option +@cindex g77 options, -@w{}-driver +@cindex options, -@w{}-driver +@item +Remove support for the @samp{--driver} option, +as @code{g77} now does all the driving, +just like @code{gcc}. + +@item +Allow any numeric argument to intrinsics +@code{Int2} and @code{Int8}. +@end itemize + @heading In 0.5.21: @itemize @bullet @item @@ -3525,9 +3655,16 @@ to avoid compiler crashes resulting from coding errors that these diagnostics normally would identify. @item -Fix @code{libU77} routines that accept file names -to strip trailing spaces from them, for consistency +Fix @code{libU77} routines that accept file and other names +to strip trailing blanks from them, for consistency with other implementations. +Blanks may be forcibly appended to such names by +appending a single null character (@samp{CHAR(0)}) +to the significant trailing blanks. + +@item +Fix @code{CHMOD} intrinsic to work with file names +that have embedded blanks, commas, and so on. @item Fix @code{SIGNAL} intrinsic so it accepts an @@ -3556,8 +3693,20 @@ Add @code{INT2} and @code{INT8} intrinsics. Add @code{CPU_TIME} intrinsic. @item +Add @code{ALARM} intrinsic. + +@item @code{CTIME} intrinsic now accepts any @code{INTEGER} argument, not just @code{INTEGER(KIND=2)}. + +@item +@code{g77} driver now prints version information (such as produced +by @kbd{g77 -v}) to @code{stderr} instead of @code{stdout}. + +@item +The @samp{.r} suffix now designates a Ratfor source file, +to be preprocessed via the @code{ratfor} command, available +separately. @end itemize @heading In 0.5.20: @@ -3606,7 +3755,7 @@ building it from this and future versions of @code{g77}. @item Dave Love's implementation of @code{libU77} has been added to the version of @code{libf2c} distributed with -and built by @code{g77}. +and built as part of @code{g77}. @code{g77} now knows about the routines in this library as intrinsics. @@ -3654,8 +3803,8 @@ This type is wide enough (holds the same number of bits) as the character-pointer type on the machine. -On most systems, this won't make a noticeable difference, -whereas on Alphas and other systems with 64-bit pointers, +On most machines, this won't make a difference, +whereas, on Alphas and other systems with 64-bit pointers, the @code{INTEGER(KIND=0)} type is equivalent to @code{INTEGER(KIND=2)} (often referred to as @code{INTEGER*8}) instead of the more common @code{INTEGER(KIND=1)} @@ -3731,6 +3880,15 @@ A new group of intrinsics, @samp{gnu}, has been added to contain the new @code{REALPART}, @code{IMAGPART}, and @code{COMPLEX} intrinsics. An old group, @samp{dcp}, has been removed. + +@item +Complain about industry-wide ambiguous references +@samp{REAL(@var{expr})} and @samp{AIMAG(@var{expr})}, +where @var{expr} is @code{DOUBLE COMPLEX} (or any +complex type other than @code{COMPLEX}), unless +@samp{-ff90} option specifies Fortran 90 interpretation +or new @samp{-fugly-complex} option, in conjunction with +@samp{-fnot-f90}, specifies @code{f2c} interpretation. @end itemize @heading In 0.5.19: |