[glibc/ibm/2.30/master] arm: Fix softp-fp Implies (BZ #25635)

[glibc/ibm/2.30/master] arm: Fix softp-fp Implies (BZ #25635)

[Tulio Magno Quites Machado Filho]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4f0ae74135a58eb88c76cd061a984e919e5a2433

commit 4f0ae74135a58eb88c76cd061a984e919e5a2433
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Mar 5 13:14:41 2020 +0000

    arm: Fix softp-fp Implies (BZ #25635)
    
    The commit "arm: Split BE/LE abilist"
    (1673ba87fefe019c834c09d33673d1d453ea698d) changed the soft-fp order for
    ARM selection when __SOFTFP__ is defined by the compiler.
    
    On 2.30 the sysdeps order is:
    
    2.30
    sysdeps/unix/sysv/linux/arm
    sysdeps/arm/nptl
    sysdeps/unix/sysv/linux
    sysdeps/nptl
    sysdeps/pthread
    sysdeps/gnu
    sysdeps/unix/inet
    sysdeps/unix/sysv
    sysdeps/unix/arm
    sysdeps/unix
    sysdeps/posix
    sysdeps/arm/nofpu
    sysdeps/ieee754/soft-fp
    sysdeps/arm
    sysdeps/wordsize-32
    sysdeps/ieee754/flt-32
    sysdeps/ieee754/dbl-64
    sysdeps/ieee754
    sysdeps/generic
    
    While on master is:
    
    sysdeps/unix/sysv/linux/arm/le
    sysdeps/unix/sysv/linux/arm
    sysdeps/arm/nptl
    sysdeps/unix/sysv/linux
    sysdeps/nptl
    sysdeps/pthread
    sysdeps/gnu
    sysdeps/unix/inet
    sysdeps/unix/sysv
    sysdeps/unix/arm
    sysdeps/unix
    sysdeps/posix
    sysdeps/arm/le
    sysdeps/arm
    sysdeps/wordsize-32
    sysdeps/ieee754/flt-32
    sysdeps/ieee754/dbl-64
    sysdeps/arm/nofpu
    sysdeps/ieee754/soft-fp
    sysdeps/ieee754
    sysdeps/generic
    
    It make the build select some routines (fadd, fdiv, fmul, fsub, and fma)
    on ieee754/flt-32 and ieee754/dbl-64 that requires fenv support to be
    correctly rounded which in turns lead to math failures since the
    __SOFTFP__ does not have fenv support.
    
    With this patch the order is now:
    
    sysdeps/unix/sysv/linux/arm/le
    sysdeps/unix/sysv/linux/arm
    sysdeps/arm/nptl
    sysdeps/unix/sysv/linux
    sysdeps/nptlsysdeps/pthread
    sysdeps/gnu
    sysdeps/unix/inet
    sysdeps/unix/sysv
    sysdeps/unix/arm
    sysdeps/unix
    sysdeps/posix
    sysdeps/arm/le/nofpu
    sysdeps/arm/nofpu
    sysdeps/ieee754/soft-fp
    sysdeps/arm/le
    sysdeps/arm
    sysdeps/wordsize-32
    sysdeps/ieee754/flt-32
    sysdeps/ieee754/dbl-64
    sysdeps/ieee754
    sysdeps/generic
    
    Checked on arm-linux-gnuaebi.
    
    (cherry picked from commit af09e5e5d9ec3ca20891e61a6922eac984fcbdc4)

Diff:
---
 NEWS                         | 1 +
 sysdeps/arm/be/nofpu/Implies | 1 +
 sysdeps/arm/le/nofpu/Implies | 1 +
 3 files changed, 3 insertions(+)

diff --git a/NEWS b/NEWS
index 76cfbcaa16..1dabaf9329 100644
--- a/NEWS
+++ b/NEWS
@@ -45,6 +45,7 @@ The following bugs are resolved with this release:
   [25401] Remove incorrect alloc_size attribute from pvalloc
   [25487] sinl() stack corruption from crafted input (CVE-2020-10029)
   [25523] MIPS/Linux inline syscall template is miscompiled
+  [25635] arm: Wrong sysdep order selection for soft-fp
 
 \f
 Version 2.30
diff --git a/sysdeps/arm/be/nofpu/Implies b/sysdeps/arm/be/nofpu/Implies
new file mode 100644
index 0000000000..c90dd7fd5c
--- /dev/null
+++ b/sysdeps/arm/be/nofpu/Implies
@@ -0,0 +1 @@
+arm/nofpu
diff --git a/sysdeps/arm/le/nofpu/Implies b/sysdeps/arm/le/nofpu/Implies
new file mode 100644
index 0000000000..c90dd7fd5c
--- /dev/null
+++ b/sysdeps/arm/le/nofpu/Implies
@@ -0,0 +1 @@
+arm/nofpu