Re: 1.75 test suite failure with HP-UX C compiler and #endif

[Akim Demaille]

| > From: Albert Chin-A-Young <address@hidden>
| > Date: Wed, 13 Nov 2002 18:05:35 -0600
| 
| > Removing the lines with solitary backslashes solves the problem.
| 
| Thanks.  I installed this patch.
| 
| 2002-11-13  Paul Eggert  <address@hidden>
| 
|       * tests/input.at (Torturing the Scanner): Remove lines containing
|       solitary backslashes, as they tickle a bug in the HP-UX 11i C
|       compiler.
| 
| Index: input.at
| ===================================================================
| RCS file: /cvsroot/bison/bison/tests/input.at,v
| retrieving revision 1.17
| retrieving revision 1.18
| diff -p -u -r1.17 -r1.18
| --- input.at  12 Nov 2002 07:28:25 -0000      1.17
| +++ input.at  14 Nov 2002 00:26:45 -0000      1.18
| @@ -100,7 +100,6 @@ const char *foo = "So %{ and %} can be h
|  #ifdef __STDC__
|  /\
|  * A comment with backslash-newlines in it. %{ %} *\
| -\
|  /
|  
|  char str[] = "\\
| @@ -108,7 +107,6 @@ char str[] = "\\
|  "";
|  
|  char apostrophe = '\\
| -\
|  '\
|  ';
|  #endif

And I'm installing this one in Autoconf.

Index: ChangeLog
from  Akim Demaille  <address@hidden>

        * doc/autoconf.texi (C Compiler): Solitary backslashes.
        From Paul Eggert and Albert Chin-A-Young.

Index: doc/autoconf.texi
===================================================================
RCS file: /cvsroot/autoconf/autoconf/doc/autoconf.texi,v
retrieving revision 1.713
diff -u -u -r1.713 autoconf.texi
--- doc/autoconf.texi 12 Nov 2002 10:54:45 -0000 1.713
+++ doc/autoconf.texi 14 Nov 2002 08:16:52 -0000
@@ -4943,6 +4943,43 @@
 @node C Compiler
 @subsection C Compiler Characteristics
 
+The following macros provide ways to find and exercise a C Compiler.
+There are a few constructs that ought to be avoided, but do not deserve
+being checked for, since they can easily be worked around.
+
address@hidden @asis
address@hidden Don't use lines containing solitary backslashes
+They tickle a bug in the HP-UX C compiler (checked on HP-UX 10.20,
+11.00, and 11i).  Running the compiler on the following source,
+
address@hidden
+#ifdef __STDC__
+/\
+* A comment with backslash-newlines in it. address@hidden address@hidden *\
+\
+/
+char str[] = "\\
+" A string with backslash-newlines in it address@hidden address@hidden \\
+"";
+char apostrophe = '\\
+\
+'\
+';
+#endif
address@hidden example
+
address@hidden
+yields
+
address@hidden
address@hidden: "foo.c", line 13: error 4048: Non-terminating comment at end of 
file.
address@hidden: "foo.c", line 13: error 4033: Missing #endif at end of file.
address@hidden example
+
address@hidden
+Removing the lines with solitary backslashes solves the problem.
address@hidden table
+
 @defmac AC_PROG_CC (@ovar{compiler-search-list})
 @acindex PROG_CC
 @ovindex CC