attribute: Work around compiler bug of Oracle cc 12.6

attribute: Work around compiler bug of Oracle cc 12.6

[Bruno Haible]

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The test-uninames.sh test fails, when compiled by cc from Oracle Developer
Studio 12.6:
  - on Solaris/sparc64, regardless of optimization,
  - on Solaris/x86_64 and Linux/x86_64, when not optimizing (just "cc -m64").

This patch fixes it, by disabling the use of __attribute__ ((__packed__))
with this compiler. Find attached also a standalone test case.


2024-03-29  Bruno Haible  <bruno@clisp.org>

	attribute: Work around compiler bug of Oracle cc 12.6.
	* m4/gnulib-common.m4 (gl_COMMON_BODY): Expand _GL_ATTRIBUTE_PACKED to
	empty on SunPRO C.

diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4
index d8d0904f78..d028b0ac2a 100644
--- a/m4/gnulib-common.m4
+++ b/m4/gnulib-common.m4
@@ -1,4 +1,4 @@
-# gnulib-common.m4 serial 92
+# gnulib-common.m4 serial 93
 dnl Copyright (C) 2007-2024 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -504,8 +504,10 @@ AC_DEFUN([gl_COMMON_BODY]
    minimizing the memory required.  */
 /* Applies to: struct members, struct, union,
    in C++ also: class.  */
+/* Oracle Studio 12.6 miscompiles code with __attribute__ ((__packed__)) despite
+   __has_attribute OK.  */
 #ifndef _GL_ATTRIBUTE_PACKED
-# if _GL_HAS_ATTRIBUTE (packed)
+# if _GL_HAS_ATTRIBUTE (packed) && !defined __SUNPRO_C
 #  define _GL_ATTRIBUTE_PACKED __attribute__ ((__packed__))
 # else
 #  define _GL_ATTRIBUTE_PACKED

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