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assimp: work around gcc bug on SuperH

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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>
This commit is contained in:
Thomas Petazzoni 2017-02-26 23:38:26 +01:00
parent 0fae8618a3
commit 68cebedeb9
1 changed files with 8 additions and 0 deletions
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8
package/assimp/assimp.mk
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@ -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)"