New expf and exp2f version without SVID compat wrapper

This patch changes the expf and exp2f error handling semantics to only
set errno accoring to POSIX rules. New symbol version is introduced at
GLIBC_2.27.

The old wrappers are kept for compat symbols.

Internal calls to __expf now get the new error semantics, this seems to
only affect sysdeps/i386/fpu/s_expm1f.S where the errno-only behaviour
should be correct.

ia64 needed assembly change to have the new and compat versioned symbol
map to the same function.

All linux libm abilists are updated.

	* math/Versions (expf): New libm symbol at GLIBC_2.27.
	(exp2f): Likewise.
	* math/w_exp2f.c: New file.
	* math/w_expf.c: New file.
	* math/w_exp2f_compat.c (__exp2f_compat): For compat symbol only.
	* math/w_expf_compat.c (__expf_compat): Likewise.
	* sysdeps/ia64/fpu/e_exp2f.S: Add versioned symbols.
	* sysdeps/ia64/fpu/e_expf.S: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.

5 files changed, 23 insertions, 7 deletions

diff --git a/math/Versions b/math/Versions
index e409de0681..380f6a2a1a 100644
--- a/math/Versions
+++ b/math/Versions
@@ -229,4 +229,7 @@ libm {
     fromfp; fromfpf; fromfpl; ufromfp; ufromfpf; ufromfpl;
     fromfpx; fromfpxf; fromfpxl; ufromfpx; ufromfpxf; ufromfpxl;
   }
+  GLIBC_2.27 {
+    expf; exp2f;
+  }
 }
diff --git a/math/w_exp2f.c b/math/w_exp2f.c
new file mode 100644
index 0000000000..948d745dab
--- /dev/null
+++ b/math/w_exp2f.c
@@ -0,0 +1,7 @@
+#include <math-type-macros-float.h>
+#undef __USE_WRAPPER_TEMPLATE
+#define __USE_WRAPPER_TEMPLATE 1
+#undef declare_mgen_alias
+#define declare_mgen_alias(a, b)
+#include <w_exp2_template.c>
+versioned_symbol (libm, __exp2f, exp2f, GLIBC_2_27);
diff --git a/math/w_exp2f_compat.c b/math/w_exp2f_compat.c
index b058daed30..6ab6f6c6de 100644
--- a/math/w_exp2f_compat.c
+++ b/math/w_exp2f_compat.c
@@ -6,9 +6,9 @@
 #include <math_private.h>
 #include <math-svid-compat.h>
 
-#if LIBM_SVID_COMPAT
+#if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_27)
 float
-__exp2f (float x)
+__exp2f_compat (float x)
 {
   float z = __ieee754_exp2f (x);
   if (__builtin_expect (!isfinite (z) || z == 0, 0)
@@ -18,5 +18,5 @@ __exp2f (float x)
 
   return z;
 }
-weak_alias (__exp2f, exp2f)
+compat_symbol (libm, __exp2f_compat, exp2f, GLIBC_2_1);
 #endif
diff --git a/math/w_expf.c b/math/w_expf.c
new file mode 100644
index 0000000000..6d5f03c5f9
--- /dev/null
+++ b/math/w_expf.c
@@ -0,0 +1,7 @@
+#include <math-type-macros-float.h>
+#undef __USE_WRAPPER_TEMPLATE
+#define __USE_WRAPPER_TEMPLATE 1
+#undef declare_mgen_alias
+#define declare_mgen_alias(a, b)
+#include <w_exp_template.c>
+versioned_symbol (libm, __expf, expf, GLIBC_2_27);
diff --git a/math/w_expf_compat.c b/math/w_expf_compat.c
index a38ff4082d..2512498bb3 100644
--- a/math/w_expf_compat.c
+++ b/math/w_expf_compat.c
@@ -20,10 +20,10 @@
 #include <math_private.h>
 #include <math-svid-compat.h>
 
-#if LIBM_SVID_COMPAT
+#if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_27)
 /* wrapper expf */
 float
-__expf (float x)
+__expf_compat (float x)
 {
   float z = __ieee754_expf (x);
   if (__builtin_expect (!isfinite (z) || z == 0, 0)
@@ -32,6 +32,5 @@ __expf (float x)
 
   return z;
 }
-hidden_def (__expf)
-weak_alias (__expf, expf)
+compat_symbol (libm, __expf_compat, expf, GLIBC_2_0);
 #endif