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Diffstat (limited to 'gcc/doc/cpp.texi')
| -rw-r--r-- | gcc/doc/cpp.texi | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi index 0e7d9e878a0..194175362a8 100644 --- a/gcc/doc/cpp.texi +++ b/gcc/doc/cpp.texi @@ -3512,19 +3512,21 @@ The preprocessor and compiler interpret character constants in the same way; i.e.@: escape sequences such as @samp{\a} are given the values they would have on the target machine. -Multi-character character constants are interpreted a character at a -time, shifting the previous result left by the number of bits per -target character and or-ing the value of the new character truncated -to the width of a target character. They have type @code{int}, and -are treated as signed regardless of whether single characters are -signed or not (a slight change from versions 3.1 and earlier of GCC). -If there are more characters in the constant than would fit in the -target @code{int} an error is issued. +The compiler values a multi-character character constant a character +at a time, shifting the previous value left by the number of bits per +target character, and then or-ing in the bit-pattern of the new +character truncated to the width of a target character. The final +bit-pattern is given type @code{int}, and is therefore signed, +regardless of whether single characters are signed or not (a slight +change from versions 3.1 and earlier of GCC). If there are more +characters in the constant than would fit in the target @code{int} the +compiler issues a warning, and the excess leading characters are +ignored. For example, 'ab' for a target with an 8-bit @code{char} would be interpreted as @w{(int) ((unsigned char) 'a' * 256 + (unsigned char) -'b')}, and 'a\234' as @w{(int) ((unsigned char) 'a' * 256 + (unsigned -char) '\234')}. +'b')}, and '\234a' as @w{(int) ((unsigned char) '\234' * 256 + (unsigned +char) 'a')}. @item Source file inclusion. |