target/89125 - BSD and math functions

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).

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.
	* targhooks.cc (bsd_libc_has_function): New function.
	Expand the supported math functions to inclue C99 libm.
	* targhooks.h (bsd_libc_has_function): New Prototype.

diff --git a/gcc/config/freebsd.h b/gcc/config/freebsd.h
index 28ebcad..d89ee7d 100644 (file)
--- 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 e22bc66..399d6f8 100644 (file)
--- 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 ecfa112..ecce55e 100644 (file)
--- 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);