xalloc-die: Fix link error with Solaris cc

[Bruno Haible]

A gnulib testdir of module 'array-oset' fails to compile with Solaris 10 cc:

cc -xarch=generic64 -O -D_STDC_C99=  -g  -L/home/haible/prefix-x86_64/lib -o 
test-array_oset test-array_oset.o libtests.a ../gllib/libgnu.a libtests.a 
../gllib/libgnu.a  
Undefined                       first referenced
 symbol                             in file
xrealloc                            test-array_oset.o
xmalloc                             test-array_oset.o
ld: fatal: symbol referencing errors. No output written to test-array_oset
*** Error code 1

The reason is that apparently this compiler does not eliminate unused inline
functions from xalloc.h, despite the option '-O'.

This patch fixes it.


2020-10-19  Bruno Haible  <bruno@clisp.org>

        xalloc-die: Fix link error with Solaris cc (regression 2020-07-27).
        * lib/xalloc.h (xalloc_die): Don't declare if GNULIB_XALLOC_DIE is 0.
        (xmalloc, xzalloc, xcalloc, xrealloc, x2realloc, xmemdup, xstrdup,
        XMALLOC, XNMALLOC, XZALLOC, XCALLOC, xnmalloc, xnrealloc, x2nrealloc,
        xcharalloc): Don't declare/define if GNULIB_XALLOC is 0.
        * modules/xalloc (configure.ac): Define GNULIB_XALLOC.
        * modules/xalloc-die (configure.ac): Define GNULIB_XALLOC_DIE.

diff --git a/lib/xalloc.h b/lib/xalloc.h
index 24273ff..d4f96bf 100644
--- a/lib/xalloc.h
+++ b/lib/xalloc.h
@@ -31,11 +31,14 @@ _GL_INLINE_HEADER_BEGIN
 # define XALLOC_INLINE _GL_INLINE
 #endif
 
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 
+#if GNULIB_XALLOC_DIE
+
 /* This function is always triggered when memory is exhausted.
    It must be defined by the application, either explicitly
    or by using gnulib's xalloc-die module.  This is the
@@ -43,6 +46,10 @@ extern "C" {
    memory allocation failure.  */
 /*extern*/ _Noreturn void xalloc_die (void);
 
+#endif /* GNULIB_XALLOC_DIE */
+
+#if GNULIB_XALLOC
+
 void *xmalloc (size_t s)
       _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_ALLOC_SIZE ((1));
 void *xzalloc (size_t s)
@@ -64,23 +71,23 @@ char *xstrdup (char const *str)
 
 /* Allocate an object of type T dynamically, with error checking.  */
 /* extern t *XMALLOC (typename t); */
-#define XMALLOC(t) ((t *) xmalloc (sizeof (t)))
+# define XMALLOC(t) ((t *) xmalloc (sizeof (t)))
 
 /* Allocate memory for N elements of type T, with error checking.  */
 /* extern t *XNMALLOC (size_t n, typename t); */
-#define XNMALLOC(n, t) \
-   ((t *) (sizeof (t) == 1 ? xmalloc (n) : xnmalloc (n, sizeof (t))))
+# define XNMALLOC(n, t) \
+    ((t *) (sizeof (t) == 1 ? xmalloc (n) : xnmalloc (n, sizeof (t))))
 
 /* Allocate an object of type T dynamically, with error checking,
    and zero it.  */
 /* extern t *XZALLOC (typename t); */
-#define XZALLOC(t) ((t *) xzalloc (sizeof (t)))
+# define XZALLOC(t) ((t *) xzalloc (sizeof (t)))
 
 /* Allocate memory for N elements of type T, with error checking,
    and zero it.  */
 /* extern t *XCALLOC (size_t n, typename t); */
-#define XCALLOC(n, t) \
-   ((t *) (sizeof (t) == 1 ? xzalloc (n) : xcalloc (n, sizeof (t))))
+# define XCALLOC(n, t) \
+    ((t *) (sizeof (t) == 1 ? xzalloc (n) : xcalloc (n, sizeof (t))))
 
 
 /* Allocate an array of N objects, each with S bytes of memory,
@@ -211,8 +218,15 @@ xcharalloc (size_t n)
   return XNMALLOC (n, char);
 }
 
+#endif /* GNULIB_XALLOC */
+
+
 #ifdef __cplusplus
 }
+#endif
+
+
+#if GNULIB_XALLOC && defined __cplusplus
 
 /* C++ does not allow conversions from void * to other pointer types
    without a cast.  Use templates to work around the problem when
@@ -248,7 +262,8 @@ xmemdup (T const *p, size_t s)
   return (T *) xmemdup ((void const *) p, s);
 }
 
-#endif
+#endif /* GNULIB_XALLOC && C++ */
+
 
 _GL_INLINE_HEADER_END
 
diff --git a/modules/xalloc b/modules/xalloc
index c6e3cfd..6500756 100644
--- a/modules/xalloc
+++ b/modules/xalloc
@@ -15,6 +15,7 @@ xalloc-oversized
 
 configure.ac:
 gl_XALLOC
+gl_MODULE_INDICATOR([xalloc])
 
 Makefile.am:
 lib_SOURCES += xmalloc.c
diff --git a/modules/xalloc-die b/modules/xalloc-die
index 23ade89..f53de5a 100644
--- a/modules/xalloc-die
+++ b/modules/xalloc-die
@@ -14,6 +14,7 @@ stdint
 xalloc-oversized
 
 configure.ac:
+gl_MODULE_INDICATOR([xalloc-die])
 
 Makefile.am:
 lib_SOURCES += xalloc-die.c