[PATCH] PR target/89125

[Steve Kargl <sgk@troutmask.apl.washington.edu>]

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Can someone, anyone, please commit the attach patch, which is 
also attached to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89125
where one can read the audit trail.  The original patch was 
submitted 2 years ago, and required manual intervention due to
the recent *.c to *.cc rename.

Back story: When GCC is configured and built on non-glibc platforms,
it seems very little to no effort is made to enumerate the available
C99 libm functions.  It is all or nothing for C99 libm.  The patch
introduces a new function, used on only FreeBSD, to inform gcc that
it has C99 libm functions (minus a few which clearly GCC does not check
nor test).

The patch introduces no regression on x86_64-*-freebsd while
allowing an additional 31 new passes.

                === gcc Summary ===
                                w/o patch  w patch
# of expected passes            175405     175434
# of unexpected failures        1081       1051
# of unexpected successes       20         20
# of expected failures          1459       1459
# of unresolved testcases       10         10
# of unsupported tests          3252       3252

                === g++ Summary ===
                                w/o patch  w patch
# of expected passes            225338     225341
# of unexpected failures        678        676
# of expected failures          2071       2071
# of unresolved testcases       11         11
# of unsupported tests          10353      10353

                === gfortran Summary ===
                                w/o patch  w patch
# of expected passes            65901      65901
# of unexpected failures        12         12
# of expected failures          272        272
# of unsupported tests          100        100


2022-04-15  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR target/89125
	* config/freebsd.h: Define TARGET_LIBC_HAS_FUNCTION to be
	bsd_libc_has_function.
	* gcc/targhooks.cc(bsd_libc_has_function): New function.
	Expand the supported math functions to inclue C99 libm.
	* gcc/targhooks.h: Prototype for bsd_libc_has_function.

-- 
Steve

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diff --git a/gcc/config/freebsd.h b/gcc/config/freebsd.h
index 28ebcad88d4..d89ee7dfc97 100644
--- a/gcc/config/freebsd.h
+++ b/gcc/config/freebsd.h
@@ -55,7 +55,7 @@ along with GCC; see the file COPYING3.  If not see
 #endif
 
 #undef TARGET_LIBC_HAS_FUNCTION
-#define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
+#define TARGET_LIBC_HAS_FUNCTION bsd_libc_has_function
 
 /* Use --as-needed -lgcc_s for eh support.  */
 #ifdef HAVE_LD_AS_NEEDED
diff --git a/gcc/targhooks.cc b/gcc/targhooks.cc
index e22bc66a6c8..ff127763cf2 100644
--- a/gcc/targhooks.cc
+++ b/gcc/targhooks.cc
@@ -1843,6 +1843,20 @@ no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED,
   return false;
 }
 
+/* Assume some c99 functions are present at the runtime including sincos.  */ 
+bool
+bsd_libc_has_function (enum function_class fn_class,
+		       tree type ATTRIBUTE_UNUSED)
+{
+  if (fn_class == function_c94
+      || fn_class == function_c99_misc
+      || fn_class == function_sincos)
+    return true;
+
+  return false;
+}
+
+
 tree
 default_builtin_tm_load_store (tree ARG_UNUSED (type))
 {
diff --git a/gcc/targhooks.h b/gcc/targhooks.h
index ecfa11287ef..ecce55ebe79 100644
--- a/gcc/targhooks.h
+++ b/gcc/targhooks.h
@@ -212,6 +212,7 @@ extern bool default_libc_has_function (enum function_class, tree);
 extern bool default_libc_has_fast_function (int fcode);
 extern bool no_c99_libc_has_function (enum function_class, tree);
 extern bool gnu_libc_has_function (enum function_class, tree);
+extern bool bsd_libc_has_function (enum function_class, tree);
 
 extern tree default_builtin_tm_load_store (tree);