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-rw-r--r--Help/command/COMPILE_OPTIONS_SHELL.txt9
-rw-r--r--Help/command/add_compile_options.rst2
-rw-r--r--Help/command/target_compile_options.rst2
3 files changed, 13 insertions, 0 deletions
diff --git a/Help/command/COMPILE_OPTIONS_SHELL.txt b/Help/command/COMPILE_OPTIONS_SHELL.txt
new file mode 100644
index 0000000..a1316c8
--- /dev/null
+++ b/Help/command/COMPILE_OPTIONS_SHELL.txt
@@ -0,0 +1,9 @@
+The final set of compile options used for a target is constructed by
+accumulating options from the current target and the usage requirements of
+it dependencies. The set of options is de-duplicated to avoid repetition.
+While beneficial for individual options, the de-duplication step can break
+up option groups. For example, ``-D A -D B`` becomes ``-D A B``. One may
+specify a group of options using shell-like quoting along with a ``SHELL:``
+prefix. The ``SHELL:`` prefix is dropped and the rest of the option string
+is parsed using the :command:`separate_arguments` ``UNIX_COMMAND`` mode.
+For example, ``"SHELL:-D A" "SHELL:-D B"`` becomes ``-D A -D B``.
diff --git a/Help/command/add_compile_options.rst b/Help/command/add_compile_options.rst
index 3fe2a33..44924e6 100644
--- a/Help/command/add_compile_options.rst
+++ b/Help/command/add_compile_options.rst
@@ -21,3 +21,5 @@ Arguments to ``add_compile_options`` may use "generator expressions" with
the syntax ``$<...>``. See the :manual:`cmake-generator-expressions(7)`
manual for available expressions. See the :manual:`cmake-buildsystem(7)`
manual for more on defining buildsystem properties.
+
+.. include:: COMPILE_OPTIONS_SHELL.txt
diff --git a/Help/command/target_compile_options.rst b/Help/command/target_compile_options.rst
index 3e7dc47..b7b4dc1 100644
--- a/Help/command/target_compile_options.rst
+++ b/Help/command/target_compile_options.rst
@@ -38,3 +38,5 @@ Arguments to ``target_compile_options`` may use "generator expressions"
with the syntax ``$<...>``. See the :manual:`cmake-generator-expressions(7)`
manual for available expressions. See the :manual:`cmake-buildsystem(7)`
manual for more on defining buildsystem properties.
+
+.. include:: COMPILE_OPTIONS_SHELL.txt