linux-kernel - [PATCH 1/3] kbuild: install_headers.sh: Strip

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Date:   Tue, 11 Dec 2018 19:26:45 +0000
From:   Dave Martin <Dave.Martin@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
        Alan Hayward <alan.hayward@....com>,
        Szabolcs Nagy <szabolcs.nagy@....com>
Subject: [PATCH 1/3] kbuild: install_headers.sh: Strip _UAPI from #if-defined() guards

install_headers.sh knows how to strip the _UAPI prefix from #ifdef/
ifndef and #define directives used to guard headers against multiple
or inappropriate inclusion.  Currently this does not work for guards
in the "#if defined()" style, which may be needed for non-trivial
cases.

This patch adds similar logic so that the _UAPI prefix is also
stripped from guard directives written using "#if defined()" etc.

This is not completely foolproof, but will work for simple cases of
using #if defined() to guard against inappropriate header inclusion.

Signed-off-by: Dave Martin <Dave.Martin@....com>
---
 scripts/headers_install.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index 593f8879..fe1d3fc 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -38,6 +38,7 @@ do
 		-e 's/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\1__attribute__((packed))\2/g' \
 		-e 's/(^|[[:space:](])(inline|asm|volatile)([[:space:](]|$)/\1__\2__\3/g' \
 		-e 's@#(ifndef|define|endif[[:space:]]*/[*])[[:space:]]*_UAPI@#\1 @' \
+		-e ':1;s/(#(if|elif)(.*[^A-Za-z0-9_])defined\([[:space:]]*)_UAPI/\1/;t1' \
 		"$SRCDIR/$i" > "$OUTDIR/$FILE.sed" || exit 1
 	scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ "$OUTDIR/$FILE.sed" \
 		> "$OUTDIR/$FILE"
-- 
2.1.4