Improve auto-detection of "restrict" keyword

Update and improve the auto-detection of the "restrict" keyword; add
more test cases to detect more possible failures. Disable testing the
array syntax

void foo (double A[restrict]);

where the "restrict" keyword is given within the square brackets;
instead, one can use the pointer syntax

void foo (double *restrict const A);

which is tested.

Add support for the gcc built-in function "builtin_expect", which
tells the compiler the value that an expression is most likely to
have.

Re-enable the (currently commented out) definitions for attribute(hot)
and attribute(cold).


git-svn-id: http://svn.cactuscode.org/flesh/trunk@4702 17b73243-c579-4c4c-a9d2-2d5706c11dac

1 files changed, 11 insertions, 7 deletions

diff --git a/lib/make/configure.in b/lib/make/configure.in
index eee68c61..9d43bc83 100644
--- a/lib/make/configure.in
+++ b/lib/make/configure.in
@@ -874,13 +874,17 @@ CCTK_CXX_ATTRIBUTE_UNUSED
 CCTK_C_ATTRIBUTE_ALIGNED
 CCTK_CXX_ATTRIBUTE_ALIGNED
 
-## Find out whether the C compiler supports __attribute__((cold))
-#CCTK_C_ATTRIBUTE_COLD
-#CCTK_CXX_ATTRIBUTE_COLD
-#
-## Find out whether the C compiler supports __attribute__((hot))
-#CCTK_C_ATTRIBUTE_HOT
-#CCTK_CXX_ATTRIBUTE_HOT
+# Find out whether the C compiler supports __attribute__((cold))
+CCTK_C_ATTRIBUTE_COLD
+CCTK_CXX_ATTRIBUTE_COLD
+
+# Find out whether the C compiler supports __attribute__((hot))
+CCTK_C_ATTRIBUTE_HOT
+CCTK_CXX_ATTRIBUTE_HOT
+
+# Find out whether the C compiler supports __builtin_expect
+CCTK_C_BUILTIN_EXPECT
+CCTK_CXX_BUILTIN_EXPECT
 
 CCTK_FORTRAN_REAL4
 CCTK_FORTRAN_REAL8