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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: undefined reference to `raise' with musl static toolchain
Date: Wed, 9 May 2018 17:24:37 +0200
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Cc: Rich Felker <dalias@libc.org>,
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* Thomas Petazzoni <thomas.petazzoni@bootlin.com> [2018-05-09 15:44:07 +0200]:
> 
> So: why does a musl-based toolchain requires an explicit -static, while
> it isn't needed with uClibc-ng ?
> 

there can be many reasons.. 

e.g. if mktime in uclibc-ng happens to reference raise then it
would get linked in independently of libgcc.

or maybe uclibc-ng has its own __aeabi_*div implementation.

or the way libgcc was configured, the raise(SIGFPE) was disabled
(it is only enabled for linux targets, but who knows how
*-linux-uclibcgnueabihf is interpreted).

you can check these using nm/objdump/readelf on libc.a and libgcc.a