[docs][llvm-objcopy] Update --output-target text with right defaults
The --output-target documentation has slightly rotted, as the default is
no longer purely based on the input file format, but also the value of
--input-target. This patch updates the documentation to make this
explicit.
Reviewed by: MaskRay, alexshap
Differential Revision: https://reviews.llvm.org/D79318
diff --git a/llvm/docs/CommandGuide/llvm-objcopy.rst b/llvm/docs/CommandGuide/llvm-objcopy.rst
index 14e08d7..c5cff2e 100644
--- a/llvm/docs/CommandGuide/llvm-objcopy.rst
+++ b/llvm/docs/CommandGuide/llvm-objcopy.rst
@@ -417,7 +417,8 @@
Write the output as the specified format. See `SUPPORTED FORMATS`_ for a list
of valid ``<format>`` values. If unspecified, the output format is assumed to
- be the same as the input file's format.
+ be the same as the value specified for :option:`--input-target` or the input
+ file's format if that option is also unspecified.
.. option:: --prefix-alloc-sections <prefix>