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* README.Portability: Small update.

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From-SVN: r35056
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Neil Booth 2000-07-16 02:14:14 +00:00 committed by Neil Booth
parent 5b2ff385d5
commit 59a5130c3c
2 changed files with 23 additions and 4 deletions
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gcc/ChangeLog
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@ -1,3 +1,7 @@
2000-07-16 Neil Booth <NeilB@earthling.net>
* README.Portability: Small update.
2000-07-15 Richard Henderson <rth@cygnus.com>
* config/ia64/ia64-protos.h (ia64_move_ok): Prototype.

23
gcc/README.Portability
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@ -50,6 +50,13 @@ should be written
String literals
---------------
Some SGI compilers choke on the parentheses in:-
const char string[] = ("A string");
This is unfortunate since this is what the GNU gettext macro N_
produces. You need to find a different way to code it.
K+R C did not allow concatenation of string literals like
"This is a " "single string literal".
@ -80,8 +87,8 @@ needs to be coded in some other way.
signed keyword
--------------
The signed keyword did not exist in K+R comilers, it was introduced in
ISO C89, so you cannot use it. In both K+R and standard C,
The signed keyword did not exist in K+R compilers, it was introduced
in ISO C89, so you cannot use it. In both K+R and standard C,
unqualified char and bitfields may be signed or unsigned. There is no
way to portably declare signed chars or signed bitfields.
@ -163,8 +170,9 @@ double respectively.
Calling functions through pointers to functions
-----------------------------------------------
K+R C compilers require brackets around the dereferenced pointer
variable, whereas ISO C relaxes the syntax. For example
K+R C compilers require parentheses around the dereferenced function
pointer expression in the call, whereas ISO C relaxes the syntax. For
example
typedef void (* cl_directive_handler) PARAMS ((cpp_reader *, const char *));
*p->handler (pfile, p->arg);
@ -192,6 +200,13 @@ will stringify an argument; to get the same result on K+R and ISO
compilers x should not have spaces around it.
Passing structures by value
---------------------------
Avoid passing structures by value, either to or from functions. It
seems some K+R compilers handle this differently or not at all.
Enums
-----