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Diffstat (limited to 'doc/bitbake-user-manual/bitbake-user-manual-metadata.xml')
| -rw-r--r-- | doc/bitbake-user-manual/bitbake-user-manual-metadata.xml | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml b/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml index 6103f34f0..badc7c0e4 100644 --- a/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml +++ b/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml @@ -61,6 +61,48 @@ </para> </section> + <section id='line-joining'> + <title>Line Joining</title> + + <para> + Outside of + <link linkend='functions'>functions</link>, BitBake joins + any line ending in a backslash character ("\") + with the following line before parsing statements. + The most common use for the "\" character is to split variable + assignments over multiple lines, as in the following example: + <literallayout class='monospaced'> + FOO = "bar \ + baz \ + qaz" + </literallayout> + Both the "\" character and the newline character + that follow it are removed when joining lines. + Thus, no newline characters end up in the value of + <filename>FOO</filename>. + </para> + + <para> + Consider this additional example where the two + assignments both assign "barbaz" to + <filename>FOO</filename>: + <literallayout class='monospaced'> + FOO = "barbaz" + + FOO = "bar\ + baz" + </literallayout> + <note> + BitBake does not interpret escape sequences like + "\n" in variable values. + For these to have an effect, the value must be passed + to some utility that interprets escape sequences, + such as <filename>printf</filename> or + <filename>echo -n</filename>. + </note> + </para> + </section> + <section id='variable-expansion'> <title>Variable Expansion</title> |