diff options
Diffstat (limited to 'gcc/fortran/invoke.texi')
| -rw-r--r-- | gcc/fortran/invoke.texi | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi index 2be5b5a18b9..22dd8983acd 100644 --- a/gcc/fortran/invoke.texi +++ b/gcc/fortran/invoke.texi @@ -239,6 +239,11 @@ Allow @samp{$} as a valid character in a symbol name. @cindex escape characters Change the interpretation of backslashes in string literals from a single backslash character to ``C-style'' escape characters. +The following combinations are expanded \a, \b, \f, \n, \r, \t, +\v, \\, and \0 to the ASCII characters alert, backspace, form feed, +newline, carriage return, horizontal tab, vertical tab, backslash, +and NUL, respectively. All other combinations of a character preceded +by \ are unexpanded. @item -fmodule-private @opindex @code{fmodule-private} @@ -303,10 +308,13 @@ in. The option @option{-fopenmp} implies @option{-frecursive}. @item -fno-range-check @opindex @code{frange-check} Disable range checking on results of simplification of constant -expressions during compilation. For example, by default, GNU Fortran -will give an overflow error at compile time when simplifying @code{a = -EXP(1000)}. With @option{-fno-range-check}, no error will be given and -the variable @code{a} will be assigned the value @code{+Infinity}. +expressions during compilation. For example, GNU Fortran will give +an error at compile time when simplifying @code{a = 1. / 0}. +With this option, no error will be given and @code{a} will be assigned +the value @code{+Infinity}. If an expression evaluates to a value +outside of the relevant range of [@code{-HUGE()}:@code{HUGE()}], +then the expression will be replaced by @code{-Inf} or @code{+Inf} +as appropriate. Similarly, @code{DATA i/Z'FFFFFFFF'/} will result in an integer overflow on most systems, but with @option{-fno-range-check} the value will ``wrap around'' and @code{i} will be initialized to @math{-1} instead. |
