We don't want people to run architecture/OS/makepkg.conf specific
processes during prepare() and in fact it's been observed that makepkg
by design doesn't even run prepare_buildenv() for it, so the prohibition
against this is now baked into makepkg.

Reflect this differentiation in the documentation on just what, exactly,
a prepare() function is.

Signed-off-by: Eli Schwartz <[email protected]>
---

This patch coincides with quequotion's clarification of the options=()
array, so thanks for inspiring me to write this!

I believe that both patches have merit independent of each other.

 doc/PKGBUILD.5.asciidoc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/doc/PKGBUILD.5.asciidoc b/doc/PKGBUILD.5.asciidoc
index e8ce691f..285627ab 100644
--- a/doc/PKGBUILD.5.asciidoc
+++ b/doc/PKGBUILD.5.asciidoc
@@ -342,9 +342,12 @@ files into the packaging directory, with optional 
`prepare()`, `build()`, and
 *prepare() Function*::
        An optional `prepare()` function can be specified in which operations to
        prepare the sources for building, such as patching, are performed. This
-       function is run after the source extraction and before the `build()`
-       function. The `prepare()` function is skipped when source extraction
-       is skipped.
+       function is run exactly once, after the source extraction and before the
+       `build()` function. The `prepare()` function is skipped when source
+       extraction is skipped. No system-specific or build-specific commands 
should
+       be run during `prepare()` under any circumstances, as they are meant to 
run
+       exclusively during `build()`, and features like `buildflags` or 
`makeflags`
+       are expressly not available.
 
 *build() Function*::
        The optional `build()` function is use to compile and/or adjust the 
source
-- 
2.21.0

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