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Diffstat (limited to '01_crosscc.md')
| -rw-r--r-- | 01_crosscc.md | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/01_crosscc.md b/01_crosscc.md index 74f2d07..348f571 100644 --- a/01_crosscc.md +++ b/01_crosscc.md @@ -495,13 +495,14 @@ Musl is quite easy to build but requires some special handling, because it doesn't use autotools. The configure script is actually a hand written shell script that tries to emulate some of the typical autotools handling: - CC="${TARGET}-gcc" $srcdir/configure --prefix=/usr --target="$TARGET" + CC="${TARGET}-gcc" $srcdir/configure --prefix=/ --includedir=/usr/include \ + --target="$TARGET" We override the shell variable **CC** to point to the cross compiler that we just built. Remember, we added **$TCDIR/bin** to our **PATH**. -We do the same thing for actually compiling musl and we explicitly set the -**DESTDIR** variable for installing: +We also set the compiler for actually compiling musl and we explicitly set +the **DESTDIR** variable for installing: CC="${TARGET}-gcc" make make DESTDIR="$SYSROOT" install @@ -511,7 +512,7 @@ We do the same thing for actually compiling musl and we explicitly set the The important part here, that later also applies for autotools based stuff, is that we don't set **--prefix** to the sysroot directory. We set the prefix so that the build system "thinks" it compiles the library to be installed -in `/usr`, but then we install the compiled binaries and headers to the sysroot +in `/`, but then we install the compiled binaries and headers to the sysroot directory. The `sysroot/usr/include` directory should now contain a bunch of standard @@ -519,9 +520,9 @@ headers. Likewise, the `sysroot/usr/lib` directory should now contain a `libc.so`, a bunch of dummy libraries, and the startup object code provided by Musl. -Despite the prefix we set, Musl installs a `sysroot/lib/ld-musl-armhf.so.1` -symlink which points to `/usr/lib/libc.so`. Dynamically linked programs built -with our toolchain will have `/lib/ld-musl-armhf.so.1` set as their loader. +The prefix is set to `/` because we want the libraries to be installed +to `/lib` instead of `/usr/lib`, but we still want the header files +in `/usr/include`, so we explicitly specifiy the **--includedir**. ### Second pass GCC |