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Bug#864464: openjdk-9: Please drop armel from hotspot_archs

Source: openjdk-9
Version: 9~b170-2
Severity: normal
User: debian-arm@lists.debian.org
Usertags: armel


openjdk-9 currently fails to build from source on armel because
the ARM-specific code in the native Hotspot JVM uses instructions
like "bkpt" [1] and "pld" [2] which are only available on ARMv5
and newer while armel is equivalent to ARMv4T.

I have already looked into patching out some of the ARMv5 assembly
for armel and while getting rid of "bkpt" is a matter of not defining
BREAKPOINT as __asm__ volatile ("bkpt"),

--- a/hotspot/src/cpu/arm/vm/globalDefinitions_arm.hpp  2017-05-11 12:11:42.000000000 +0000
+++ b/hotspot/src/cpu/arm/vm/globalDefinitions_arm.hpp  2017-06-08 21:48:36.527377766 +0000
@@ -70,7 +70,7 @@
 #define C1_LIRGENERATOR_MD_HPP "c1_LIRGenerator_arm.hpp"
-#ifdef ARM32
+#if defined(ARM32) && defined(__ARM_FP)
 #define BREAKPOINT __asm__ volatile ("bkpt")

getting rid of "pld" wasn't that easy because it's part of a larger
assembly source. Thus, the only viable option is to drop armel
from the list hotspot_archs in debian/rules.

Thanks for consideration!


> [1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0068b/CIHBIGGI.html
> [2] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204f/CJADCFDC.html

 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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