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boost: context needs C++11

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Without std=c++11, mutex is not always correctly detected with gcc 4.7,
4.8 or even 5.x. As a result, boost_thread is wrongly selected by
boost_context.

mutex is available on gcc 4.7.x, the issue is that boost does not
correctly detect it because -std=c++11 was missing.
Keep thread select for gcc version lower or equal to 4.6. mutex is
available since gcc 4.4 (with std=c++0x) but common buildroot practice
for C++11 packages is to have a dependency on gcc 4.7, 4.8 or 4.9
depending on the requested C++11 features.

Fixes:
 - http://autobuild.buildroot.net/results/fb046c04fe18bec973d120e4ab33971f32ba5769
 - http://autobuild.buildroot.net/results/99f1a255b78a973faeb8bf3b94d78efc54426a8b

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Fabrice Fontaine 2018-08-21 23:25:47 +02:00 committed by Thomas Petazzoni
parent 1554db330d
commit f3a483a81b
2 changed files with 6 additions and 1 deletions
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2
package/boost/Config.in
View File

@ -83,7 +83,7 @@ config BR2_PACKAGE_BOOST_CONTEXT
bool "boost-context"
depends on BR2_PACKAGE_BOOST_CONTEXT_ARCH_SUPPORTS
depends on !BR2_TOOLCHAIN_HAS_GCC_BUG_64735
select BR2_PACKAGE_BOOST_THREAD if !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
select BR2_PACKAGE_BOOST_THREAD if !BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
help
C++11 context switching library.

5
package/boost/boost.mk
View File

@ -61,6 +61,11 @@ else
BOOST_FLAGS += --without-icu
endif
# boost-context needs C++11
ifeq ($(BR2_PACKAGE_BOOST_CONTEXT)$(BR2_TOOLCHAIN_GCC_AT_LEAST_4_7),yy)
BOOST_TARGET_CXXFLAGS += -std=c++11
endif
ifeq ($(BR2_PACKAGE_BOOST_IOSTREAMS),y)
BOOST_DEPENDENCIES += bzip2 zlib
endif