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Date: Wed, 10 Nov 2021 16:40:45 +0100
From: Markus Wichmann <nullplan@....net>
To: musl@...ts.openwall.com
Subject: Re: Cross compiling with LLVM/clang
On Wed, Nov 10, 2021 at 05:28:57PM +1100, Matt Andrews wrote:
> ./configure: error: unsupported long double type
musl supports three implementations of "long double": IEEE 754 double
precision, IEEE 754 double extended precision, and IEEE 754 quad
precision (also known as Binary-64, Binary-80, and Binary-128,
respectively). The configure program attempts to figure out which of
these your compiler is using by including <float.h> and testing the
standard macros LDBL_MANT_DIG and LDBL_MAX_EXP for well known
combinations.
Thankfully, with gcc and clang these are easy to find out:
$COMPILER -E -dM -xc /dev/null | grep LDBL
Can you post the output of this (setting COMPILER to "clang
--target=whatever")? It is possible you need another switch to change
the "long double" implementation. Note that that needs to be consistent
across all compiles against musl.
Ciao,
Markus
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