musl: backport various post-1.1.15 fixes

Backport most important fixes up to latest HEAD

- Taken post-commit reverts/fixes into account

Compile tested
Run-tested on cns3xxx & imx6 targets

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/toolchain/musl/patches/048-math-fix-pow-signed-shift-ub.patch b/toolchain/musl/patches/048-math-fix-pow-signed-shift-ub.patch
new file mode 100644
index 0000000000..fde857b213
--- /dev/null
+++ b/toolchain/musl/patches/048-math-fix-pow-signed-shift-ub.patch
@@ -0,0 +1,38 @@
+From 688d3da0f1730daddbc954bbc2d27cc96ceee04c Mon Sep 17 00:00:00 2001
+From: Szabolcs Nagy <nsz@port70.net>
+Date: Tue, 4 Oct 2016 03:58:56 +0200
+Subject: math: fix pow signed shift ub
+
+j is int32_t and thus j<<31 is undefined if j==1, so j is changed to
+uint32_t locally as a quick fix, the generated code is not affected.
+
+(this is a strict conformance fix, future c standard may allow 1<<31,
+see DR 463.  the bug was inherited from freebsd fdlibm, the proper fix
+is to use uint32_t for all bit hacks, but that requires more intrusive
+changes.)
+
+reported by Daniel Sabogal
+---
+ src/math/pow.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/math/pow.c b/src/math/pow.c
+index b66f632..3ddc1b6 100644
+--- a/src/math/pow.c
++++ b/src/math/pow.c
+@@ -125,11 +125,11 @@ double pow(double x, double y)
+ 		else if (iy >= 0x3ff00000) {
+ 			k = (iy>>20) - 0x3ff;  /* exponent */
+ 			if (k > 20) {
+-				j = ly>>(52-k);
++				uint32_t j = ly>>(52-k);
+ 				if ((j<<(52-k)) == ly)
+ 					yisint = 2 - (j&1);
+ 			} else if (ly == 0) {
+-				j = iy>>(20-k);
++				uint32_t j = iy>>(20-k);
+ 				if ((j<<(20-k)) == iy)
+ 					yisint = 2 - (j&1);
+ 			}
+-- 
+cgit v0.11.2