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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Xen-devel <xen-devel@lists.xenproject.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Jan Beulich" <JBeulich@suse.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>, "Wei Liu" <wl@xen.org>,
	"Stefano Stabellini" <sstabellini@kernel.org>,
	"Julien Grall" <julien@xen.org>,
	"Volodymyr Babchuk" <Volodymyr_Babchuk@epam.com>,
	"Juergen Gross" <jgross@suse.com>
Subject: [PATCH 7/7] xen: Use -Og for debug builds when available
Date: Mon, 19 Apr 2021 15:01:32 +0100	[thread overview]
Message-ID: <20210419140132.16909-8-andrew.cooper3@citrix.com> (raw)
In-Reply-To: <20210419140132.16909-1-andrew.cooper3@citrix.com>

The recommended optimisation level for debugging is -Og, and is what tools
such as gdb prefer.  In practice, it equates to -01 with a few specific
optimisations turned off.

While the use of gdb isn't necessarily very helpful for Xen, the disassembly
will have fewer structural transformations vs C, and therefore will be easier
to follow.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Wei Liu <wl@xen.org>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien@xen.org>
CC: Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
CC: Juergen Gross <jgross@suse.com>

Successful CI runs:
  https://gitlab.com/xen-project/people/andyhhp/xen/-/pipelines/287769787
  https://cirrus-ci.com/build/5086280275984384
---
 xen/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/Makefile b/xen/Makefile
index 9f3be7766d..128de93f5e 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -195,7 +195,9 @@ include/config/%.conf include/config/%.conf.cmd: $(KCONFIG_CONFIG)
 	$(MAKE) $(kconfig) syncconfig
 
 ifeq ($(CONFIG_DEBUG),y)
-CFLAGS += -O1
+# Use -Og if available, -O1 otherwise
+dbg_opt_level := $(call cc-option,$(CC),-Og,-O1)
+CFLAGS += $(dbg_opt_level)
 else
 CFLAGS += -O2
 endif
-- 
2.11.0



  parent reply	other threads:[~2021-04-19 14:02 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-19 14:01 [PATCH 0/7] xen: Switch to using -Og for debug builds Andrew Cooper
2021-04-19 14:01 ` [PATCH 1/7] xen/arm: Make make_cpus_node() compile at -Og Andrew Cooper
2021-04-22 18:20   ` Julien Grall
2021-04-19 14:01 ` [PATCH 2/7] x86/shim: Fix compilation " Andrew Cooper
2021-04-19 14:01 ` [PATCH 3/7] x86/sysctl: Make arch_do_sysctl() compile " Andrew Cooper
2021-04-19 14:01 ` [PATCH 4/7] x86/irq: Make create_irq() " Andrew Cooper
2021-04-19 14:01 ` [PATCH 5/7] xen/efi: Make efi_start() " Andrew Cooper
2021-04-19 14:01 ` [PATCH 6/7] x86/shadow: Make _shadow_prealloc() " Andrew Cooper
2021-04-22  7:52   ` Tim Deegan
2021-04-19 14:01 ` Andrew Cooper [this message]
2021-04-19 15:45 ` [PATCH 0/7] xen: Switch to using -Og for debug builds Jan Beulich
2021-04-21  9:31   ` Andrew Cooper
2021-04-21  9:51     ` Jan Beulich

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