From: Olivier Hainque <hainque@adacore.com>
Date: Sat, 20 Apr 2024 15:35:41 +0000 (-0300)
Subject: Infer TOOL/TOOL_FAMILY from vxworks-predef.h on VxWorks7
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=c3a37c4d5fe55878f81601fd16f1ce5259f4162f;p=thirdparty%2Fgcc.git

Infer TOOL/TOOL_FAMILY from vxworks-predef.h on VxWorks7

This change moves, for VxWorks 7, the setting of the TOOL
and TOOL_FAMILY macros from a builtin_define to a run-time
computation from vxworks-predefs.h.

This is useful on Vx7 to allow a single toolchain to be used
for instances of VxWorks based on either a gnu or an llvm system
toolchain for a given cpu (typically, powerpc).

This is achieved by leveraging the existence of a very basic
autoconf.h file in all VxWorks 7 VSBs, #included directly from
vxworks-predef.h.

gcc/
	* config/vxworks.h (VXWORKS_OS_CPP_BUILTINS): Only
	builtin_define TOOL and TOOL_FAMILY for !TARGET_VXWORKS7.
	Augment comment on VXWORKS_PERSONALITY.
	* config/vxworks/vxworks-predef.h: Infer TOOL and TOOL_FAMILY
	from the VSB autoconf.h	when we have one, determined by the presence
	of a _VSB_CONFIG_FILE definition.

libgcc/
	* config/t-vxworks: -include vxworks-predef.h explicitly, as the
	automatic inclusion is disabled by -nostdinc.
---

diff --git a/gcc/config/vxworks.h b/gcc/config/vxworks.h
index d2b6025caad9..7268ace41ece 100644
--- a/gcc/config/vxworks.h
+++ b/gcc/config/vxworks.h
@@ -365,9 +365,16 @@ extern void vxworks_asm_out_destructor (rtx symbol, int priority);
 
 /* A VxWorks implementation of TARGET_OS_CPP_BUILTINS.  */
 
-/* The VxWorks personality we rely on, controlling which sections of system
-   headers files we trigger.  This might be redefined on targets where the
-   base VxWorks environment doesn't come with a GNU toolchain.  */
+/* The VxWorks personality we rely on for VxWorks prior to 7, controlling the
+   definition of TOOL and TOOL_FAMILY macros used within system headers and
+   expected to match the kind of system toolchain on which the OS instance is
+   based (typically, gnu or llvm).  This might be redefined on targets where
+   the base VxWorks environment doesn't come with a GNU toolchain.
+
+   From VxWorks 7 on, the actual personality might vary for different instances
+   for a given architecture.  The TOOL/TOOL_FAMILY definitions are infered at
+   run-time from vxworks-predef.h, which allows accommodating such variations
+   with a single toolchain.  */
 
 #define VXWORKS_PERSONALITY "gnu"
 
@@ -381,8 +388,6 @@ extern void vxworks_asm_out_destructor (rtx symbol, int priority);
 	builtin_define ("__RTP__");					\
       else								\
 	builtin_define ("_WRS_KERNEL");					\
-      builtin_define ("TOOL_FAMILY=" VXWORKS_PERSONALITY);		\
-      builtin_define ("TOOL=" VXWORKS_PERSONALITY);			\
       if (TARGET_VXWORKS7)						\
         {								\
            builtin_define ("_VSB_CONFIG_FILE=<config/vsbConfig.h>");	\
@@ -394,6 +399,11 @@ extern void vxworks_asm_out_destructor (rtx symbol, int priority);
 	   if (!flag_isoc99 && !c_dialect_cxx())			\
              builtin_define ("_ALLOW_KEYWORD_MACROS");			\
         }								\
+      else								\
+	{								\
+	  builtin_define ("TOOL_FAMILY=" VXWORKS_PERSONALITY);		\
+	  builtin_define ("TOOL=" VXWORKS_PERSONALITY);			\
+	}								\
       /* C++ support relies on C99 features from C++11, even C++98	\
          for listdc++ in particular, with corresponding checks at	\
          configure time.  Make sure C99 features are exposed by the	\
diff --git a/gcc/config/vxworks/vxworks-predef.h b/gcc/config/vxworks/vxworks-predef.h
index 0ea70fb8c730..46df32c7cc8f 100644
--- a/gcc/config/vxworks/vxworks-predef.h
+++ b/gcc/config/vxworks/vxworks-predef.h
@@ -29,4 +29,25 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    that the OS actually defines it as.  */
 #define __STDC_ISO_10646__		200009L
 
+/* If we have a designated VSB configuration file, fetch the associated
+   auto configuration header from which we can infer the TOOL and TOOL_FAMILY
+   that other system headers expect.  */
+
+#if defined(_VSB_CONFIG_FILE)
+
+#undef TOOL
+#undef TOOL_FAMILY
+
+#include <config/autoconf.h>
+
+#if defined(_WRS_CONFIG_PRI_llvm)
+#define TOOL_FAMILY llvm
+#elif defined(_WRS_CONFIG_PRI_gnu)
+#define TOOL_FAMILY gnu
+#endif
+
+#define TOOL TOOL_FAMILY
+
+#endif /* _VSB_CONFIG_FILE */
+
 #endif
diff --git a/libgcc/config/t-vxworks b/libgcc/config/t-vxworks
index 81a4deab073f..42db6a8cb705 100644
--- a/libgcc/config/t-vxworks
+++ b/libgcc/config/t-vxworks
@@ -30,7 +30,7 @@ LIB2FUNCS_EXCLUDE += _clear_cache
 # paths differs between Windows and Linux hosts as the latter can perform
 # inode based checks while the former may only rely on name comparisons.
 
-LIBGCC2_INCLUDES = -nostdinc -I. \
+LIBGCC2_INCLUDES = -nostdinc -include vxworks-predef.h -I. \
   $(if $(findstring vxworks7, $(target_noncanonical)), \
     -I$(VSB_DIR)/h -I$(VSB_DIR)/share/h -I=/system -I=/public, \
     -I=/ -I=/wrn/coreip) \