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glibc/sysdeps/ieee754/ldbl-96
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Martin Jansa 27c5e756a2 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.
2019-01-04 16:17:48 +00:00
..
bits Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
include/bits Add canonicalize, canonicalizef, canonicalizel. 2016-10-26 23:14:31 +00:00
e_acoshl.c Rename all __ieee754_sqrt(f/l) calls to sqrt(f/l) 2018-03-15 19:21:36 +00:00
e_asinl.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
e_atanhl.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
e_coshl.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_gammal_r.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
e_hypotl.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
e_j0l.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
e_j1l.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
e_jnl.c sysdeps/ieee754: prevent maybe-uninitialized errors with -O [BZ #19444] 2019-01-04 16:17:48 +00:00
e_lgammal_r.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
e_rem_pio2l.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
e_sinhl.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
gamma_product.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
gamma_productl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
k_cosl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
k_sinl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
k_tanl.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
ldbl2mpn.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
lgamma_negl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
lgamma_product.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
lgamma_productl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
Makefile Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
math_ldbl.h Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
math-nan-payload-ldouble.h Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
mpn2ldbl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
printf_fphex.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_asinhl.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
s_cbrtl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_copysignl.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
s_cosl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_daddl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_ddivl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_dmull.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_dsubl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_erfl.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_faddl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_fdivl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_fma.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_fmal.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_fmull.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_frexpl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_fromfpl_main.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_fromfpl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_fromfpxl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_fsubl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_getpayloadl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_iscanonicall.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_issignalingl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_llrintl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_llroundl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_lrintl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_lroundl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_modfl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_nexttoward.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
s_nexttowardf.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
s_nextupl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_remquol.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_roundevenl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_roundl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_scalblnl.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
s_setpayloadl_main.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_setpayloadl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_setpayloadsigl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_signbitl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_sincosl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_sinl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_tanhl.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_tanl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_totalorderl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_totalordermagl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
s_ufromfpl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
s_ufromfpxl.c Use libm_alias_ldouble for ldbl-96 functions. 2017-10-05 21:13:40 +00:00
strtold_l.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
t_sincosl.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
test-canonical-ldbl-96.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
test-totalorderl-ldbl-96.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
x2y2m1.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00
x2y2m1l.c Update copyright dates with scripts/update-copyrights. 2019-01-01 00:11:28 +00:00