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am33x-cm3: Enforce correct -march option 

Buildroot uses a normal ARM compiler to build the AM33X CM3 firmware
(which runs on a Cortex-M3 processor), but Buildroot will have a
default -march value that doesn't necessarily match the one needed for
Cortex-M3, leading to build failures (gcc complains that the
-mcpu=cortex-m3 option being passed is not compatible with the
selected -march).

Fix this by explicitly indicating -march=armv7-m.

Fixes:

   http://autobuild.buildroot.net/results/db1/db13623b1701bfe678c302e8f88c7473cb2345f9/build-end.log

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Thomas Petazzoni 2013-06-09 00:57:38 +00:00 committed by Peter Korsgaard
parent 1d0f68f476
commit c73c5fc90d
1 changed files with 26 additions and 0 deletions
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26
package/am33x-cm3/am33x-cm3-0001-fix-makefile.patch Normal file
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@ -0,0 +1,26 @@
Enforce correct -march option
Buildroot uses a normal ARM compiler to build the AM33X CM3 firmware
(which runs on a Cortex-M3 processor), but Buildroot will have a
default -march value that doesn't necessarily match the one needed for
Cortex-M3, leading to build failures (gcc complains that the
-mcpu=cortex-m3 option being passed is not compatible with the
selected -march).
Fix this by explicitly indicating -march=armv7-m.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Index: b/Makefile
===================================================================
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@
BINDIR = bin
INCLUDES = $(SRCDIR)/include
-CFLAGS =-mcpu=cortex-m3 -mthumb -nostdlib -Wall -g -I$(INCLUDES)
+CFLAGS =-march=armv7-m -mcpu=cortex-m3 -mthumb -nostdlib -Wall -g -I$(INCLUDES)
LDFLAGS =-nostartfiles -fno-exceptions -Tfirmware.ld
EXECUTABLE=am335x-pm-firmware.elf