* [Buildroot] [PATCH] assimp: work around gcc bug on SuperH
@ 2017-02-26 22:38 Thomas Petazzoni
2017-02-27 20:39 ` Thomas Petazzoni
0 siblings, 1 reply; 2+ messages in thread
From: Thomas Petazzoni @ 2017-02-26 22:38 UTC (permalink / raw)
To: buildroot
gcc versions earlier than gcc 6.x fail to build assimp on SuperH when
static linking:
AssxmlExporter.cpp:623:1: error: unable to find a register to spill in class 'GENERAL_REGS'
It's the combination of -Os and *not* having -fPIC that makes gcc
fail, which explains why configurations with dynamic linking work
fine.
-Os -fPIC -> works
-Os -> fails
-O2 -fPIC -> works
-O2 -> works
Therefore, as a workaround, we are forcing the use of -O2 on SuperH
when the gcc version is older than gcc 6.x and we're statically
linking.
Fixes:
http://autobuild.buildroot.net/results/ec88aa8118179e30e24603cc45292047dca19216/
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
package/assimp/assimp.mk | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/package/assimp/assimp.mk b/package/assimp/assimp.mk
index 08893ff..298e121 100644
--- a/package/assimp/assimp.mk
+++ b/package/assimp/assimp.mk
@@ -16,6 +16,14 @@ ifeq ($(BR2_m68k),y)
ASSIMP_CXXFLAGS += -mxgot
endif
+# workaround SuperH compiler failure when static linking (i.e -fPIC is
+# not passed) in gcc versions 5.x or older. The -Os optimization level
+# causes a "unable to find a register to spill in class
+# ?GENERAL_REGS?" error. -O2 works fine.
+ifeq ($(BR2_sh):$(BR2_STATIC_LIBS):$(BR2_HOST_GCC_AT_LEAST_6),y:y:)
+ASSIMP_CXXFLAGS += -O2
+endif
+
ASSIMP_CONF_OPTS += -DASSIMP_BUILD_TESTS=OFF \
-DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) $(ASSIMP_CXXFLAGS)"
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [Buildroot] [PATCH] assimp: work around gcc bug on SuperH
2017-02-26 22:38 [Buildroot] [PATCH] assimp: work around gcc bug on SuperH Thomas Petazzoni
@ 2017-02-27 20:39 ` Thomas Petazzoni
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Petazzoni @ 2017-02-27 20:39 UTC (permalink / raw)
To: buildroot
Hello,
On Sun, 26 Feb 2017 23:38:26 +0100, Thomas Petazzoni wrote:
> gcc versions earlier than gcc 6.x fail to build assimp on SuperH when
> static linking:
>
> AssxmlExporter.cpp:623:1: error: unable to find a register to spill in class 'GENERAL_REGS'
>
> It's the combination of -Os and *not* having -fPIC that makes gcc
> fail, which explains why configurations with dynamic linking work
> fine.
>
> -Os -fPIC -> works
> -Os -> fails
> -O2 -fPIC -> works
> -O2 -> works
>
> Therefore, as a workaround, we are forcing the use of -O2 on SuperH
> when the gcc version is older than gcc 6.x and we're statically
> linking.
>
> Fixes:
>
> http://autobuild.buildroot.net/results/ec88aa8118179e30e24603cc45292047dca19216/
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
> package/assimp/assimp.mk | 8 ++++++++
> 1 file changed, 8 insertions(+)
Applied to master, thanks.
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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