netchild's mega-patch to isolate compiler dependencies into a central

place.

This moves the dependency on GCC's and other compiler's features into
the central sys/cdefs.h file, while the individual source files can
then refer to #ifdef __COMPILER_FEATURE_FOO where they by now used to
refer to #if __GNUC__ > 3.1415 && __BARC__ <= 42.

By now, GCC and ICC (the Intel compiler) have been actively tested on
IA32 platforms by netchild.  Extension to other compilers is supposed
to be possible, of course.

Submitted by:	netchild
Reviewed by:	various developers on arch@, some time ago

1 files changed, 7 insertions, 2 deletions

diff --git a/sys/amd64/include/pcpu.h b/sys/amd64/include/pcpu.h
index 0694c76..b9d4a61 100644
--- a/sys/amd64/include/pcpu.h
+++ b/sys/amd64/include/pcpu.h
@@ -29,6 +29,10 @@
 #ifndef _MACHINE_PCPU_H_
 #define _MACHINE_PCPU_H_
 
+#ifndef _SYS_CDEFS_H_
+#error this file needs sys/cdefs.h as a prerequisite
+#endif
+
 #ifdef _KERNEL
 
 /*
@@ -55,7 +59,8 @@ extern struct pcpu *pcpup;
 #define PCPU_PTR(member)        (&pcpup->pc_ ## member)
 #define PCPU_SET(member,value)  (pcpup->pc_ ## member = (value))
  
-#elif defined(__GNUC__)
+#elif defined(__GNUCLIKE___TYPEOF) && defined(__GNUCLIKE___OFFSETOF) \
+    && defined(__GNUCLIKE_ASM)
 
 /*
  * Evaluates to the byte offset of the per-cpu variable name.
@@ -170,7 +175,7 @@ __curthread(void)
 #define	curthread (__curthread())
 
 #else
-#error gcc or lint is required to use this file
+#error this file needs to be ported to your compiler
 #endif
 
 #endif	/* _KERNEL */