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authorMartin Jansa <martin.jansa@gmail.com>2019-01-04 16:17:48 +0000
committerJoseph Myers <joseph@codesourcery.com>2019-01-04 16:17:48 +0000
commit27c5e756a2a8495d77480a103081a86c1ca9a1e8 (patch)
tree031c60ad881ba347d7ec850d85377928bb1f9232 /sysdeps/ieee754/dbl-64
parent8b18d418bd0ef1d2b1093e5b956bf176f41f4828 (diff)
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sysdeps/ieee754: prevent maybe-uninitialized errors with -O [BZ #19444]
With -O included in CFLAGS it fails to build with:

../sysdeps/ieee754/ldbl-96/e_jnl.c: In function '__ieee754_jnl':
../sysdeps/ieee754/ldbl-96/e_jnl.c:146:20: error: 'temp' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      b = invsqrtpi * temp / sqrtl (x);
          ~~~~~~~~~~^~~~~~
../sysdeps/ieee754/ldbl-96/e_jnl.c: In function '__ieee754_ynl':
../sysdeps/ieee754/ldbl-96/e_jnl.c:375:16: error: 'temp' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  b = invsqrtpi * temp / sqrtl (x);
      ~~~~~~~~~~^~~~~~
../sysdeps/ieee754/dbl-64/e_jn.c: In function '__ieee754_jn':
../sysdeps/ieee754/dbl-64/e_jn.c:113:20: error: 'temp' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      b = invsqrtpi * temp / sqrt (x);
          ~~~~~~~~~~^~~~~~
../sysdeps/ieee754/dbl-64/e_jn.c: In function '__ieee754_yn':
../sysdeps/ieee754/dbl-64/e_jn.c:320:16: error: 'temp' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  b = invsqrtpi * temp / sqrt (x);
      ~~~~~~~~~~^~~~~~

Build tested with Yocto for ARM, AARCH64, X86, X86_64, PPC, MIPS, MIPS64
with -O, -O1, -Os.
For AARCH64 it needs one more fix in locale for -Os:
https://sourceware.org/ml/libc-alpha/2018-09/msg00539.html

	[BZ #19444]
	* sysdeps/ieee754/dbl-64/e_jn.c (__ieee754_jn): Use
	__builtin_unreachable for default case in switch.
	(__ieee754_yn): Likewise.
	* sysdeps/ieee754/ldbl-96/e_jnl.c (__ieee754_jnl): Likewise.
	(__ieee754_ynl): Likewise.
	* sysdeps/ieee754/ldbl-128/e_jnl.c (__ieee754_jnl): Likewise.
	(__ieee754_ynl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/e_jnl.c (__ieee754_jnl): Likewise.
	(__ieee754_ynl): Likewise.
Diffstat (limited to 'sysdeps/ieee754/dbl-64')
-rw-r--r--sysdeps/ieee754/dbl-64/e_jn.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_jn.c b/sysdeps/ieee754/dbl-64/e_jn.c
index aff06ead16..90a7e77270 100644
--- a/sysdeps/ieee754/dbl-64/e_jn.c
+++ b/sysdeps/ieee754/dbl-64/e_jn.c
@@ -109,6 +109,7 @@ __ieee754_jn (int n, double x)
 	      case 1: temp = -c + s; break;
 	      case 2: temp = -c - s; break;
 	      case 3: temp = c - s; break;
+	      default: __builtin_unreachable ();
 	      }
 	    b = invsqrtpi * temp / sqrt (x);
 	  }
@@ -316,6 +317,7 @@ __ieee754_yn (int n, double x)
 	  case 1: temp = -s - c; break;
 	  case 2: temp = -s + c; break;
 	  case 3: temp = s + c; break;
+	  default: __builtin_unreachable ();
 	  }
 	b = invsqrtpi * temp / sqrt (x);
       }