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Date: Wed, 23 Mar 2016 13:08:16 +0000
From: Sérgio Marques <>
Subject: Why there's no __MUSL__ macro question

Hi all,

I've seen that there's already a topic on

but I would like to understand the reasoning for not having it defined.

Maybe by explaining my use case someone can explain why the macro is not

I has installing an *R* package in an Alpine linux distribution that uses
musl. That R package needed to be compiled using musl

"Command failed (1)

Failed to run system command:

'/usr/lib/R/bin/R' --vanilla CMD INSTALL '/tmp/RtmpDPDGNf/Rcpp'
--library='/app/packrat/lib/x86_64-alpine-linux-musl/3.2.3' --install-tests
--no-docs --no-multiarch --no-demo

The command failed with output:
* installing *source* package 'Rcpp' ...
** package 'Rcpp' successfully unpacked and MD5 sums checked
** libs
x86_64-alpine-linux-musl-g++ -I/usr/lib/R/include -DNDEBUG
-I../inst/include/ -Os -fomit-frame-pointer    -fpic  -Os
-fomit-frame-pointer  -c Date.cpp -o Date.o
x86_64-alpine-linux-musl-g++ -I/usr/lib/R/include -DNDEBUG
-I../inst/include/ -Os -fomit-frame-pointer    -fpic  -Os
-fomit-frame-pointer  -c Module.cpp -o Module.o
x86_64-alpine-linux-musl-g++ -I/usr/lib/R/include -DNDEBUG
-I../inst/include/ -Os -fomit-frame-pointer    -fpic  -Os
-fomit-frame-pointer  -c Rcpp_init.cpp -o Rcpp_init.o
x86_64-alpine-linux-musl-g++ -I/usr/lib/R/include -DNDEBUG
-I../inst/include/ -Os -fomit-frame-pointer    -fpic  -Os
-fomit-frame-pointer  -c api.cpp -o api.o
api.cpp:40:30: fatal error: execinfo.h: No such file or directory
compilation terminated.
/usr/lib/R/etc/Makeconf:141: recipe for target 'api.o' failed
make: *** [api.o] Error 1
ERROR: compilation failed for package 'Rcpp'
* removing '/app/packrat/lib/x87_64-alpine-linux-musl/3.2.3/Rcpp'"

It happens that the failure is todo with the fact that is no macro in
api.cpp which uniquely identifies we're in a distribution that is using
musl, so the compiler ends up executing some code invalid for that

How are we expected to solve this kind of problem if not by using the
__MUSL__ macro?

Thanks in advance.

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