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* [glibc] [powerpc] fenv_libc.h: protect use of __builtin_cpu_supports
@ 2019-07-09 18:12 Paul Clarke
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From: Paul Clarke @ 2019-07-09 18:12 UTC (permalink / raw)
To: glibc-cvs
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b5232c9f9e6048b8f780d3cbfadbc8e59bb90ce4
commit b5232c9f9e6048b8f780d3cbfadbc8e59bb90ce4
Author: Paul A. Clarke <pc@us.ibm.com>
Date: Mon Jul 8 17:06:19 2019 -0500
[powerpc] fenv_libc.h: protect use of __builtin_cpu_supports
Using __builtin_cpu_supports() requires support in GCC and Glibc.
My recent patch to fenv_libc.h added an unprotected use of
__builtin_cpu_supports(). Compilation of Glibc itself will fail
with a sufficiently new GCC and sufficiently old Glibc:
../sysdeps/powerpc/fpu/fegetexcept.c: In function â__fegetexceptâ:
../sysdeps/powerpc/fpu/fenv_libc.h:52:20: error: builtin â__builtin_cpu_supportsâ needs GLIBC (2.23 and newer) that exports hardware capability bits [-Werror]
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Fixes 3db85a9814784a74536a1f0e7b7ddbfef7dc84bb.
Diff:
---
ChangeLog | 5 +++++
sysdeps/powerpc/fpu/fenv_libc.h | 4 +++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/ChangeLog b/ChangeLog
index ed7283f..158337a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2019-07-09 Paul A. Clarke <pc@us.ibm.com>
+
+ * sysdeps/powerpc/fpu/fenv_libc.h (_FPU_GET_RC): Protect use of
+ __builtin_cpu_supports with __BUILTIN_CPU_SUPPORTS__.
+
2019-07-08 DJ Delorie <dj@redhat.com>
[BZ #23501]
diff --git a/sysdeps/powerpc/fpu/fenv_libc.h b/sysdeps/powerpc/fpu/fenv_libc.h
index 55b1697..9861f18 100644
--- a/sysdeps/powerpc/fpu/fenv_libc.h
+++ b/sysdeps/powerpc/fpu/fenv_libc.h
@@ -47,12 +47,14 @@ extern const fenv_t *__fe_mask_env (void) attribute_hidden;
#ifdef _ARCH_PWR9
# define fegetenv_status() fegetenv_status_ISA300()
-#else
+#elif defined __BUILTIN_CPU_SUPPORTS__
# define fegetenv_status() \
(__glibc_likely (__builtin_cpu_supports ("arch_3_00")) \
? fegetenv_status_ISA300() \
: fegetenv_register() \
)
+#else
+# define fegetenv_status() fegetenv_register ()
#endif
/* Equivalent to fesetenv, but takes a fenv_t instead of a pointer. */
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2019-07-09 18:12 [glibc] [powerpc] fenv_libc.h: protect use of __builtin_cpu_supports Paul Clarke
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