Bug#823769: please support the musl c library for cross compiler builds

[Helmut Grohne <helmut@subdivi.de>]

Source: gcc-6
Severity: wishlist
Tags: patch
User: helmutg@debian.org
Usertags: rebootstrap

Hi Matthias,

I've been working on bootstrapping a musl-based port for a while now and
think that some patches are sufficiently stable that they can go
upstream already. One of the obstacles here is the strange naming of
musl packages. The C library is just called "musl" and the development
package is called "musl-dev". Neither the naming nor the versioning
matches glibc, so the resulting packages are not installable. I am
attaching a patch that updates $(LIBC_DEP), $(libc_ver) and
$(libc_dev_ver) to match musl. Please consider applying it.

Other than this patch not much is missing for musl support. As far as I
can see, a gcc upstream change to src/libstdc++-v3/configure.host is
still trickling down and the hard-float detection is broken for musl.
Neither of which are subject of this bug. I just list those here to get
you an impression of how much is missing.

Helmut

diff -u a/debian/rules.conf b/debian/rules.conf
--- a/debian/rules.conf
+++ b/debian/rules.conf
@@ -240,6 +240,11 @@
   else
     LIBC_DEP = libc6
   endif
+  ifneq (,$(findstring musl-linux-,$(DEB_TARGET_ARCH)))
+    LIBC_DEP = musl
+    libc_ver = 0.9
+    libc_dev_ver = 0.9
+  endif
 else
   ifeq ($(DEB_TARGET_ARCH_OS),hurd)
     LIBC_DEP = libc0.3