Re: [Buildroot] ulog compilation issue with buildroot 2022.02.2

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello Andreas,

On Sun, 05 Jun 2022 06:05:09 +0000
Andreas Ziegler <br015@umbiko.net> wrote:

> This is the environment when alchemy is called from Buildroot:
> 
> ALCHEMY_TARGET_ENV = \
> 	$(TARGET_MAKE_ENV) \
> 	ALCHEMY_HOME=$(ALCHEMY_HOME) \
> 	ALCHEMY_WORKSPACE_DIR="$(@D)" \
> 	ALCHEMY_TARGET_OUT=alchemy-out \
> 	PKGCONFIG_BIN=$(PKG_CONFIG_HOST_BINARY) \
> 	TARGET_OS=linux \
> 	TARGET_OS_FLAVOUR=buildroot \
> 	TARGET_CROSS="$(TARGET_CROSS)" \
> 	TARGET_ARCH=xxx \
> 	TARGET_GLOBAL_CXXFLAGS="$(TARGET_CXXFLAGS)" \
> 	TARGET_GLOBAL_LDFLAGS="$(TARGET_LDFLAGS)" \
> 	                       ^ LDFLAGS are usually empty
> 	TARGET_GLOBAL_FFLAGS="$(TARGET_FCFLAGS)" \
> 	TARGET_GLOBAL_FCFLAGS="$(TARGET_FCFLAGS)"
> 
> Alchemy adds more settings to LDFLAGS, this is the final content:
> 
> + TARGET_GLOBAL_LDFLAGS = -O2 -Wl,-O1 
> -Lalchemy-out/staging/lib/arm-linux-gnueabihf -Lalchemy-out/staging/lib 
> -Lalchemy-out/staging/usr/lib/arm-linux-gnueabihf 
> -Lalchemy-out/staging/usr/lib 
> -Wl,-rpath-link=alchemy-out/staging/lib/arm-linux-gnueabihf 
> -Wl,-rpath-link=alchemy-out/staging/lib 
> -Wl,-rpath-link=alchemy-out/staging/usr/lib/arm-linux-gnueabihf 
> -Wl,-rpath-link=alchemy-out/staging/usr/lib
> 
> Adding the Buildroot staging library path to LDFLAGS makes the build 
> succeed:
> 
> 	...
> 	TARGET_GLOBAL_LDFLAGS="$(TARGET_LDFLAGS) -L$(STAGING_DIR)/usr/lib" \

Thanks for your investigation!

-L$(STAGING_DIR)/usr/lib should normally not be needed, because
$(STAGING_DIR)/usr/lib is in the default search path of the
cross-compiler, as the compiler has $(STAGING_DIR)/usr as its sysroot.

So from a cross-compiler perspective, -L$(STAGING_DIR)/usr/lib should
normally not be needed, and that's why it's not in $(TARGET_LDFLAGS).

Also, there is a curious thing in the report from Nicolas: the error
happens when systemd is enabled, but doesn't happen when systemd is
disabled.

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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