build-helper

Common script used in other build scripts.

• host-functions-source.sh: to be included with source in the host build script
• container-functions-source.sh: to be included with source in the container build script

Deprecated:

• builder-helper.sh: used in the first generation of build scripts.

Patches

The code used to download and extract archives can also be used to post-patch the downloaded files. For this a patch file must be placed in the patches folder, and the name must be passed as the third param to extract().

Memo

The code to apply the patch (common-functions-source.sh:extract()) does the following:

$ cd sources/binutils
$ patch -p0 < "binutils-2.31.patch"

The patch is applied from the library source folder, so it must be created with the library relative path.

For example, to create a binutils patch, use:

$ cd sources/binutils
$ cp bfd/ihex.c bfd/ihex-patched.c
$ vi bfd/ihex-patched.c
$ diff -u bfd/ihex.c bfd/ihex-patched.c > patches/binutils-2.31.patch

Alternatively, multiple changes can be generated by Git:

$ git init
$ git add -A
$ git commit -m all

Perform changes as usual.

To create a patch with the uncommitted changes that will be consumed with patch:

$ git diff --no-prefix -u > file.patch

For completeness, to create a patch with the uncommitted changes that will be consumeed with git apply file.git-patch.

$ git diff > file.git-patch

It is also possible to create patches with git and consume them with patch

$ git diff --no-prefix -u > file.patch

Links:

• https://git-scm.com/docs/git-diff
• https://git-scm.com/docs/git-apply