you don't need threads or POSIX 2008 features, even 2.4 is probably
okay.
-- A supported CPU architecture (currently i386, x86_64, or arm).
+- A supported CPU architecture (currently i386, x86_64, arm, or mips).
- If you want to use dynamic linking, it's recommended that you have
permissions to write to /lib and /etc. Otherwise your binaries will
To install musl as an alternate libc, follow these steps:
-1. Edit config.mak to select your system's CPU architecture (i386,
- x86_64, or arm), installation prefix, location for the dynamic
- linker, and other build preferences.
+1. Configure musl's build with a command similar to:
+ ./configure --prefix=/usr/local/musl --exec-prefix=/usr/local
+ Refer to ./configure --help for details on other options. You may
+ change the install prefix if you like, but DO NOT set it to a
+ location that contains your existing libraries based on another
+ libc such as glibc or uClibc. If you do not intend to use dynamic
+ linking, you may disable it at this point via --disable-shared and
+ cut the build time in half. If you wish to use dynamic linking but
+ do not have permissions to write to /lib, you will need to set an
+ alternate dynamic linker location via --syslibdir.
2. Run "make". Parallel build is fully supported, so you can instead
use "make -j3" or so on SMP systems if you like.
3. Run "make install" as a user sufficient privileges to write to the
destination.
-4. Ensure that /etc/ld-musl-$ARCH.path (where $ARCH is replaced by
- i386, x86_64, etc. as appropriate) contains the correct search path
- for where you intend to install musl-linked shared library files.
- This step can be skipped if you disabled dynamic linking.
+4. Create a file named /etc/ld-musl-$ARCH.path (where $ARCH is
+ replaced by i386, x86_64, etc. as appropriate) containing the
+ correct colon-delimited search path for where you intend to install
+ musl-linked shared library files. If this file is missing, musl
+ will search the standard path, and you will encounter problems when
+ it attempts to load libraries linked against your host libc. Note
+ that this step can be skipped if you disabled dynamic linking.
After installing, you can use musl via the musl-gcc wrapper. For
example:
./a.out
To configure autoconf-based program to compile and link against musl,
-you may wish to use:
+set the CC variable to musl-gcc when running configure, as in:
-CC="musl-gcc -D_GNU_SOURCE" ./configure ...
-
-Correctly-written build systems should not need -D_GNU_SOURCE as part
-of $CC, but many programs do not use feature-test macros correctly and
-simply assume the compiler will automatically give them the kitchen
-sink, so the above command is an easy workaround.
+CC=musl-gcc ./configure ...
You will probably also want to use --prefix when building libraries to
ensure that they are installed under the musl prefix and not in the
Finally, it's worth noting that musl's include and lib directories in
the build tree are setup to be usable without installation, if
-necessary. Just modify the musl-gcc wrapper's libc_prefix variable to
-point to the source/build tree.
+necessary. Just modify the the paths in the spec file used by musl-gcc
+(it's located at $prefix/lib/musl-gcc.specs) to point to the
+source/build tree.
the search path before you move them, or your system will break
badly and you will not be able to continue.
-2. Edit musl's config.mak and set the installation prefix to the
- prefix your compiler toolchain is configured to search, probably
- /usr. Set ARCH to match your CPU architecture, and change any other
- options as you see fit.
+2. Configure musl's build with a command similar to:
+ ./configure --prefix=/usr --disable-gcc-wrapper
+ Refer to ./configure --help for details on other options.
3. Run "make" to compile musl.
you're using static linking only, you might instead check the symbols
and look for anything suspicious that would indicate your old glibc or
uClibc was used.
-
-When building programs against musl, you may still want to ensure the
-appropriate feature test macros get defined, as in:
-
-CC="gcc -D_GNU_SOURCE" ./configure ...
-
projects / musl / blobdiff