Provide external definitions of all of the standardized functions in

fenv.h that are currently inlined.

The definitions are provided in fenv.c via 'extern inline'
declaractions.  This assumes the compiler handles 'extern inline' as
specified in C99, which has been true under FreeBSD since 8.0.

The goal is to eventually remove the 'static' keyword from the inline
definitions in fenv.h, so that non-inlined references all wind up
pointing to the same external definition like they're supposed to.
I am deferring the second step to provide a window where
newly-compiled apps will still link against old math libraries.
(This isn't supported, but there's no need to cause undue breakage.)

Reviewed by:    stefanf, bde

3 files changed, 27 insertions, 9 deletions

diff --git a/lib/msun/amd64/Symbol.map b/lib/msun/amd64/Symbol.map
index f4c13a4..3da32ff 100644
--- a/lib/msun/amd64/Symbol.map
+++ b/lib/msun/amd64/Symbol.map
@@ -7,8 +7,6 @@ FBSD_1.0 {
 	fegetenv;
 	feholdexcept;
 	feupdateenv;
-	__feenableexcept;
-	__fedisableexcept;
 	feenableexcept;
 	fedisableexcept;
 };
diff --git a/lib/msun/amd64/fenv.c b/lib/msun/amd64/fenv.c
index e126070..c543bd5 100644
--- a/lib/msun/amd64/fenv.c
+++ b/lib/msun/amd64/fenv.c
@@ -29,8 +29,14 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 #include <machine/fpu.h>
+
+#define	__fenv_static
 #include <fenv.h>
 
+#ifdef __GNUC_GNU_INLINE__
+#error "This file must be compiled with C99 'inline' semantics"
+#endif
+
 const fenv_t __fe_dfl_env = {
 	{ 0xffff0000 | __INITIAL_FPUCW__,
 	  0xffff0000,
@@ -41,6 +47,9 @@ const fenv_t __fe_dfl_env = {
 	__INITIAL_MXCSR__
 };
 
+extern inline int feclearexcept(int __excepts);
+extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts);
+
 int
 fesetexceptflag(const fexcept_t *flagp, int excepts)
 {
@@ -69,6 +78,10 @@ feraiseexcept(int excepts)
 	return (0);
 }
 
+extern inline int fetestexcept(int __excepts);
+extern inline int fegetround(void);
+extern inline int fesetround(int __round);
+
 int
 fegetenv(fenv_t *envp)
 {
@@ -98,6 +111,8 @@ feholdexcept(fenv_t *envp)
 	return (0);
 }
 
+extern inline int fesetenv(const fenv_t *__envp);
+
 int
 feupdateenv(const fenv_t *envp)
 {
diff --git a/lib/msun/amd64/fenv.h b/lib/msun/amd64/fenv.h
index 875664a..b7c9873 100644
--- a/lib/msun/amd64/fenv.h
+++ b/lib/msun/amd64/fenv.h
@@ -32,6 +32,10 @@
 #include <sys/cdefs.h>
 #include <sys/_types.h>
 
+#ifndef	__fenv_static
+#define	__fenv_static	static
+#endif
+
 typedef struct {
 	struct {
 		__uint32_t	__control;
@@ -89,7 +93,7 @@ extern const fenv_t	__fe_dfl_env;
 #define	__ldmxcsr(__csr)	__asm __volatile("ldmxcsr %0" : : "m" (__csr))
 #define	__stmxcsr(__csr)	__asm __volatile("stmxcsr %0" : "=m" (*(__csr)))
 
-static __inline int
+__fenv_static inline int
 feclearexcept(int __excepts)
 {
 	fenv_t __env;
@@ -107,7 +111,7 @@ feclearexcept(int __excepts)
 	return (0);
 }
 
-static __inline int
+__fenv_static inline int
 fegetexceptflag(fexcept_t *__flagp, int __excepts)
 {
 	__uint32_t __mxcsr;
@@ -122,7 +126,7 @@ fegetexceptflag(fexcept_t *__flagp, int __excepts)
 int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
 int feraiseexcept(int __excepts);
 
-static __inline int
+__fenv_static inline int
 fetestexcept(int __excepts)
 {
 	__uint32_t __mxcsr;
@@ -133,7 +137,7 @@ fetestexcept(int __excepts)
 	return ((__status | __mxcsr) & __excepts);
 }
 
-static __inline int
+__fenv_static inline int
 fegetround(void)
 {
 	__uint16_t __control;
@@ -148,7 +152,7 @@ fegetround(void)
 	return (__control & _ROUND_MASK);
 }
 
-static __inline int
+__fenv_static inline int
 fesetround(int __round)
 {
 	__uint32_t __mxcsr;
@@ -173,7 +177,7 @@ fesetround(int __round)
 int fegetenv(fenv_t *__envp);
 int feholdexcept(fenv_t *__envp);
 
-static __inline int
+__fenv_static inline int
 fesetenv(const fenv_t *__envp)
 {
 
@@ -197,7 +201,8 @@ int feupdateenv(const fenv_t *__envp);
 int feenableexcept(int __mask);
 int fedisableexcept(int __mask);
 
-static __inline int
+/* We currently provide no external definition of fegetexcept(). */
+static inline int
 fegetexcept(void)
 {
 	__uint16_t __control;