On Wed, 1 Jul 2026 18:43:40 +0200
Roland Mainz via Cygwin <[email protected]> wrote:
> Hi!
> 
> ----
> 
> Is anyone else seeing this build failure:
> ---- snip ---
> $ uname -a
> CYGWIN_NT-10.0-19045 bloodbath039 3.6.9-1.x86_64 2026-04-21 15:46 UTC
> x86_64 Cygwin
> $ git clone -b cygwin-3_6-branch git://cygwin.com/git/newlib-cygwin.git
> $ cd newlib-cygwin/winsup/
> $ ./autogen.sh
> $ cd ../..
> $ mkdir testinstall && cd testinstall/
> $ /home/roland_mainz/work/cygwin/newlib-cygwin/winsup/configure
> --prefix=/home/roland_mainz/work/cygwin/testinstall
> ...
> $ time nice make
> Making all in cygwin
> make[1]: Entering directory 
> '/home/roland_mainz/work/cygwin/testinstall/cygwin'
> make  all-am
> make[2]: Entering directory 
> '/home/roland_mainz/work/cygwin/testinstall/cygwin'
>  CC       math/truncl.o
> /home/roland_mainz/work/cygwin/newlib-cygwin/winsup/cygwin/math/truncl.c:
> In function ‘truncl’:
> /home/roland_mainz/work/cygwin/newlib-cygwin/winsup/cygwin/math/truncl.c:24:15:
> error: ‘FE_TOWARDZERO’ undeclared (first use in this function)
>   24 |            | (FE_TOWARDZERO << FE_CW_ROUND_SHIFT);
>      |               ^~~~~~~~~~~~~
> /home/roland_mainz/work/cygwin/newlib-cygwin/winsup/cygwin/math/truncl.c:24:15:
> note: each undeclared identifier is reported only once for each
> function it appears in
> make[2]: *** [Makefile:2076: math/truncl.o] Error 1
> make[2]: Leaving directory '/home/roland_mainz/work/cygwin/testinstall/cygwin'
> make[1]: *** [Makefile:1199: all] Error 2
> make[1]: Leaving directory '/home/roland_mainz/work/cygwin/testinstall/cygwin'
> make: *** [Makefile:398: all-recursive] Error 1
> ---- snip ----
> 
> This happens on "cygwin-3_6-branch" and the Cygwin default (3.7.0) branch...
> 

Did you  run configure?
https://www.cygwin.com/faq/faq.html#faq.programming.building-cygwin

-- 
Takashi Yano <[email protected]>

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