From 27c5e756a2a8495d77480a103081a86c1ca9a1e8 Mon Sep 17 00:00:00 2001 From: Martin Jansa Date: Fri, 4 Jan 2019 16:17:48 +0000 Subject: 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. --- sysdeps/ieee754/ldbl-128/e_jnl.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'sysdeps/ieee754/ldbl-128') diff --git a/sysdeps/ieee754/ldbl-128/e_jnl.c b/sysdeps/ieee754/ldbl-128/e_jnl.c index 7610d18..3c90072 100644 --- a/sysdeps/ieee754/ldbl-128/e_jnl.c +++ b/sysdeps/ieee754/ldbl-128/e_jnl.c @@ -150,6 +150,8 @@ __ieee754_jnl (int n, _Float128 x) case 3: temp = c - s; break; + default: + __builtin_unreachable (); } b = invsqrtpi * temp / sqrtl (x); } @@ -386,6 +388,8 @@ __ieee754_ynl (int n, _Float128 x) case 3: temp = s + c; break; + default: + __builtin_unreachable (); } b = invsqrtpi * temp / sqrtl (x); } -- cgit v1.1