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* [honister][PATCH] dev86: fix a build race
@ 2022-05-11  2:53 Anuj Mittal
  2022-05-12  4:04 ` [meta-virtualization] " Bruce Ashfield
  0 siblings, 1 reply; 2+ messages in thread
From: Anuj Mittal @ 2022-05-11  2:53 UTC (permalink / raw)
  To: meta-virtualization

From: Ross Burton <ross.burton@arm.com>

Fix a race in cpp/ where token[12].h are written to a temporary file
with the same name.

Also update the status of cross.patch.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
(cherry picked from commit 36433bfef3b690ee1211f04a38022b1f3dc2b383)
---
 ...1-cpp-fix-race-writing-token.h-files.patch | 42 +++++++++++++++++++
 recipes-extended/dev86/dev86/cross.patch      |  2 +-
 recipes-extended/dev86/dev86_git.bb           |  3 +-
 3 files changed, 45 insertions(+), 2 deletions(-)
 create mode 100644 recipes-extended/dev86/dev86/0001-cpp-fix-race-writing-token.h-files.patch

diff --git a/recipes-extended/dev86/dev86/0001-cpp-fix-race-writing-token.h-files.patch b/recipes-extended/dev86/dev86/0001-cpp-fix-race-writing-token.h-files.patch
new file mode 100644
index 0000000..d6e7999
--- /dev/null
+++ b/recipes-extended/dev86/dev86/0001-cpp-fix-race-writing-token.h-files.patch
@@ -0,0 +1,42 @@
+Upstream-Status: Submitted [https://github.com/jbruchon/dev86/pull/23]
+Signed-off-by: Ross Burton <ross.burton@arm.com>
+
+From f507ee398ae20e4e97f01dfbd9a8709a90bc760f Mon Sep 17 00:00:00 2001
+From: Ross Burton <ross.burton@arm.com>
+Date: Fri, 29 Apr 2022 16:44:08 +0100
+Subject: [PATCH] cpp: fix race writing token.h files
+
+The rules for token1.h and token2.h both write to a temporary file tmp.h
+before renaming to token1.h or token2.h. However, in a parallel build
+these will execute at the same time and race.
+
+  gperf -aptTc -N is_ctok -H hash1 token1.tok > tmp.h
+  gperf -aptTc -k1,3 -N is_ckey -H hash2 token2.tok > tmp.h
+  mv tmp.h token1.h
+  mv tmp.h token2.h
+  mv: cannot stat 'tmp.h': No such file or directory
+
+By using gperf --output-file, the race is avoided entirely.
+---
+ cpp/Makefile | 6 ++----
+ 1 file changed, 2 insertions(+), 4 deletions(-)
+
+diff --git a/cpp/Makefile b/cpp/Makefile
+index 0ea43cc..743694f 100644
+--- a/cpp/Makefile
++++ b/cpp/Makefile
+@@ -20,9 +20,7 @@ token1.o: token1.h
+ token2.o: token2.h
+ 
+ token1.h: token1.tok
+-	gperf -aptTc -N is_ctok -H hash1 token1.tok > tmp.h
+-	mv tmp.h token1.h
++	gperf -aptTc -N is_ctok -H hash1 --output-file $@ $<
+ 
+ token2.h: token2.tok
+-	gperf -aptTc -k1,3 -N is_ckey -H hash2 token2.tok > tmp.h
+-	mv tmp.h token2.h
++	gperf -aptTc -k1,3 -N is_ckey -H hash2 --output-file $@ $<
+-- 
+2.25.1
+
diff --git a/recipes-extended/dev86/dev86/cross.patch b/recipes-extended/dev86/dev86/cross.patch
index 041a8d3..fd62c5d 100644
--- a/recipes-extended/dev86/dev86/cross.patch
+++ b/recipes-extended/dev86/dev86/cross.patch
@@ -1,6 +1,6 @@
 Build ifdef using BUILD_CC, not CC.
 
-Upstream-Status: Pending
+Upstream-Status: Submitted [https://github.com/jbruchon/dev86/pull/22]
 Signed-off-by: Ross Burton <ross.burton@arm.com>
 
 diff --git a/Makefile b/Makefile
diff --git a/recipes-extended/dev86/dev86_git.bb b/recipes-extended/dev86/dev86_git.bb
index 88e9cf3..094fcbd 100644
--- a/recipes-extended/dev86/dev86_git.bb
+++ b/recipes-extended/dev86/dev86_git.bb
@@ -11,7 +11,8 @@ SRC_URI = "git://github.com/jbruchon/${BPN}.git;protocol=https;branch=master \
     file://0001-cpp-Makefile-respect-LDFLAGS-when-building-bcc-cpp.patch \
     file://0003-cpp-update-token1.tok-to-make-new-gperf-happy-regen..patch \
     file://0004-regen-token2.h-token1.h-with-gperf-3.1.patch \
-	file://cross.patch \
+    file://cross.patch \
+    file://0001-cpp-fix-race-writing-token.h-files.patch \
 "
 
 S = "${WORKDIR}/git"
-- 
2.35.3



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2022-05-11  2:53 [honister][PATCH] dev86: fix a build race Anuj Mittal
2022-05-12  4:04 ` [meta-virtualization] " Bruce Ashfield

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