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| author | Jim Meyering <meyering@redhat.com> | 2011-07-24 15:50:36 +0200 |
|---|---|---|
| committer | Jim Meyering <meyering@redhat.com> | 2011-09-01 20:25:32 +0200 |
| commit | 7a615729c9c56a3608ec0224a67f21d23ea6b3ad (patch) | |
| tree | 1ac976685064e69ea1673a1f48a1fc2f8750c978 | |
| parent | 54c726aa5c0414148d03059c1bce14baaa0c7c09 (diff) | |
| download | autoconf-7a615729c9c56a3608ec0224a67f21d23ea6b3ad.tar.gz | |
docs: improve the prose describing _AC_CHECK_TYPE_NEW_BODY
* lib/autoconf/types.m4 (_AC_CHECK_TYPE_NEW_BODY): Improve prose.
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | lib/autoconf/types.m4 | 16 |
2 files changed, 14 insertions, 7 deletions
@@ -1,3 +1,8 @@ +2011-07-24 Jim Meyering <meyering@redhat.com> + + docs: improve the prose describing _AC_CHECK_TYPE_NEW_BODY + * lib/autoconf/types.m4 (_AC_CHECK_TYPE_NEW_BODY): Improve prose. + 2011-08-31 Paul Eggert <eggert@cs.ucla.edu> AC_C_CONST: don't reject gcc -Werror -Wall diff --git a/lib/autoconf/types.m4 b/lib/autoconf/types.m4 index c47884c5..72093e99 100644 --- a/lib/autoconf/types.m4 +++ b/lib/autoconf/types.m4 @@ -80,15 +80,15 @@ # int foo (TYPE param); # # but of course you soon realize this does not make it with K&R -# compilers. And by no ways you want to +# compilers. And by no means do you want to use this: # # int foo (param) # TYPE param # { ; } # -# since this time it's C++ who is not happy. +# since C++ would complain loudly. # -# Don't even think of the return type of a function, since K&R cries +# Don't even think of using a function return type, since K&R cries # there too. So you start thinking of declaring a *pointer* to this TYPE: # # TYPE *p; @@ -101,14 +101,16 @@ # # sizeof (TYPE); # -# But this succeeds if TYPE is a variable: you get the size of the -# variable's type!!! +# That is great, but has one drawback: it succeeds when TYPE happens +# to be a variable: you'd get the size of the variable's type. +# Obviously, we must not accept a variable in place of a type name. # -# So, to filter out the last possibility, you try this too: +# So, to filter out the last possibility, we will require that this fail: # # sizeof ((TYPE)); # -# This fails if TYPE is a type, but succeeds if TYPE is actually a variable. +# This evokes a syntax error when TYPE is a type, but succeeds if TYPE +# is actually a variable. # # Also note that we use # |