Fix i686 build with GCC 9.

This patch fixes the glibc build for i686 with current mainline GCC,
where there are warnings about inconsistent attributes for aliases in
certain files defining libm IFUNCs.

In three of the files, the aliases were defined in terms of internal
symbols such as __sinf, and copied attributes from file-local
declarations of those functions which lacked the nothrow attribute.
Since the nothrow attribute is present on the declarations from
<math.h> (which include declarations of those __-prefixed functions),
the natural fix was to include <math.h> in those files, replacing the
local declarations.

In the other three files, a more complicated __hidden_ver1 call was
involved in the warnings.  <math.h> has not been included at this
point and, furthermore, it is included indirectly only later in the
source file after macros have been defined to remap a function name
therein.  So there isn't an obvious declaration from which to copy the
attribute and it seems simplest and safest just to add __THROW to the
hidden_ver1 calls.

Tested for i686 (build-many-glibcs.py compilers build for
x86_64-linux-gnu with GCC mainline; full testsuite run with GCC 7).

	* sysdeps/i386/i686/fpu/multiarch/e_expf.c [SHARED]: Use __THROW
	with __hidden_ver1 call.
	* sysdeps/i386/i686/fpu/multiarch/e_log2f.c [SHARED]: Likewise.
	* sysdeps/i386/i686/fpu/multiarch/e_logf.c [SHARED]: Likewise.
	* sysdeps/i386/i686/fpu/multiarch/s_cosf.c: Include <math.h>.
	(__cosf): Do not declare here.
	* sysdeps/i386/i686/fpu/multiarch/s_sincosf.c: Include <math.h>.
	(__sincosf): Do not declare here.
	* sysdeps/i386/i686/fpu/multiarch/s_sinf.c: Include <math.h>.
	(__sinf): Do not declare here.

6 files changed, 6 insertions, 6 deletions

diff --git a/sysdeps/i386/i686/fpu/multiarch/e_expf.c b/sysdeps/i386/i686/fpu/multiarch/e_expf.c
index 1f7c357..d11ca30 100644
--- a/sysdeps/i386/i686/fpu/multiarch/e_expf.c
+++ b/sysdeps/i386/i686/fpu/multiarch/e_expf.c
@@ -26,7 +26,7 @@ libc_ifunc_redirected (__redirect_expf, __expf, IFUNC_SELECTOR ());
 #include <libm-alias-float.h>
 #ifdef SHARED
 __hidden_ver1 (__expf_ia32, __GI___expf, __redirect_expf)
-  __attribute__ ((visibility ("hidden")));
+  __attribute__ ((visibility ("hidden"))) __THROW;
 
 # include <shlib-compat.h>
 versioned_symbol (libm, __expf, expf, GLIBC_2_27);
diff --git a/sysdeps/i386/i686/fpu/multiarch/e_log2f.c b/sysdeps/i386/i686/fpu/multiarch/e_log2f.c
index 3dacaa6..9c11536 100644
--- a/sysdeps/i386/i686/fpu/multiarch/e_log2f.c
+++ b/sysdeps/i386/i686/fpu/multiarch/e_log2f.c
@@ -26,7 +26,7 @@ libc_ifunc_redirected (__redirect_log2f, __log2f, IFUNC_SELECTOR ());
 #include <libm-alias-float.h>
 #ifdef SHARED
 __hidden_ver1 (__log2f_ia32, __GI___log2f, __redirect_log2f)
-  __attribute__ ((visibility ("hidden")));
+  __attribute__ ((visibility ("hidden"))) __THROW;
 
 # include <shlib-compat.h>
 versioned_symbol (libm, __log2f, log2f, GLIBC_2_27);
diff --git a/sysdeps/i386/i686/fpu/multiarch/e_logf.c b/sysdeps/i386/i686/fpu/multiarch/e_logf.c
index 1ce90e2..070e8b7 100644
--- a/sysdeps/i386/i686/fpu/multiarch/e_logf.c
+++ b/sysdeps/i386/i686/fpu/multiarch/e_logf.c
@@ -26,7 +26,7 @@ libc_ifunc_redirected (__redirect_logf, __logf, IFUNC_SELECTOR ());
 #include <libm-alias-float.h>
 #ifdef SHARED
 __hidden_ver1 (__logf_ia32, __GI___logf, __redirect_logf)
-  __attribute__ ((visibility ("hidden")));
+  __attribute__ ((visibility ("hidden"))) __THROW;
 
 # include <shlib-compat.h>
 versioned_symbol (libm, __logf, logf, GLIBC_2_27);
diff --git a/sysdeps/i386/i686/fpu/multiarch/s_cosf.c b/sysdeps/i386/i686/fpu/multiarch/s_cosf.c
index a4556a4..5295118 100644
--- a/sysdeps/i386/i686/fpu/multiarch/s_cosf.c
+++ b/sysdeps/i386/i686/fpu/multiarch/s_cosf.c
@@ -18,10 +18,10 @@
 
 #include <init-arch.h>
 #include <libm-alias-float.h>
+#include <math.h>
 
 extern float __cosf_sse2 (float);
 extern float __cosf_ia32 (float);
-float __cosf (float);
 
 libm_ifunc (__cosf, HAS_CPU_FEATURE (SSE2) ? __cosf_sse2 : __cosf_ia32);
 libm_alias_float (__cos, cos);
diff --git a/sysdeps/i386/i686/fpu/multiarch/s_sincosf.c b/sysdeps/i386/i686/fpu/multiarch/s_sincosf.c
index 5f21f5c..164c97b 100644
--- a/sysdeps/i386/i686/fpu/multiarch/s_sincosf.c
+++ b/sysdeps/i386/i686/fpu/multiarch/s_sincosf.c
@@ -18,10 +18,10 @@
 
 #include <init-arch.h>
 #include <libm-alias-float.h>
+#include <math.h>
 
 extern void __sincosf_sse2 (float, float *, float *);
 extern void __sincosf_ia32 (float, float *, float *);
-void __sincosf (float, float *, float *);
 
 libm_ifunc (__sincosf,
 	    HAS_CPU_FEATURE (SSE2) ? __sincosf_sse2 : __sincosf_ia32);
diff --git a/sysdeps/i386/i686/fpu/multiarch/s_sinf.c b/sysdeps/i386/i686/fpu/multiarch/s_sinf.c
index 80a7ffa..c69976b 100644
--- a/sysdeps/i386/i686/fpu/multiarch/s_sinf.c
+++ b/sysdeps/i386/i686/fpu/multiarch/s_sinf.c
@@ -18,10 +18,10 @@
 
 #include <init-arch.h>
 #include <libm-alias-float.h>
+#include <math.h>
 
 extern float __sinf_sse2 (float);
 extern float __sinf_ia32 (float);
-float __sinf (float);
 
 libm_ifunc (__sinf, HAS_CPU_FEATURE (SSE2) ? __sinf_sse2 : __sinf_ia32);
 libm_alias_float (__sin, sin);