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re PR fortran/38830 (Document lack of "Variable Format Expression" support)
PR fortran/38830 * gfortran.texi: Document that we don't support variable FORMAT expressions. From-SVN: r147258
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@ -1,3 +1,9 @@
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2009-05-07 Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
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PR fortran/38830
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* gfortran.texi: Document that we don't support variable FORMAT
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expressions.
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2009-05-07 Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
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PR fortran/39576
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@ -1641,7 +1641,7 @@ code that uses them running with the GNU Fortran compiler.
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* STRUCTURE and RECORD::
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@c * UNION and MAP::
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* ENCODE and DECODE statements::
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@c * Expressions in FORMAT statements::
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* Variable FORMAT expressions::
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@c * Q edit descriptor::
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@c * AUTOMATIC statement::
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@c * TYPE and ACCEPT I/O Statements::
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@ -1779,6 +1779,51 @@ c ... Code that sets A, B and C
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@end smallexample
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@node Variable FORMAT expressions
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@subsection Variable @code{FORMAT} expressions
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@cindex @code{FORMAT}
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A variable @code{FORMAT} expression is format statement which includes
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angle brackets enclosing a Fortran expression: @code{FORMAT(I<N>)}. GNU
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Fortran does not support this legacy extension. The effect of variable
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format expressions can be reproduced by using the more powerful (and
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standard) combination of internal output and string formats. For example,
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replace a code fragment like this:
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@smallexample
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WRITE(6,20) INT1
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20 FORMAT(I<N+1>)
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@end smallexample
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@noindent
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with the following:
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@smallexample
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c Variable declaration
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CHARACTER(LEN=20) F
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c
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c Other code here...
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c
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WRITE(FMT,'("(I", I0, ")")') N+1
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WRITE(6,FM) INT1
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@end smallexample
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@noindent
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or with:
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@smallexample
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c Variable declaration
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CHARACTER(LEN=20) FMT
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c
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c Other code here...
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c
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WRITE(FMT,*) N+1
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WRITE(6,"(I" // ADJUSTL(FMT) // ")") INT1
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@end smallexample
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@c ---------------------------------------------------------------------
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@c Intrinsic Procedures
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@c ---------------------------------------------------------------------
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