[Buildroot] [PATCH 1/1] pkg-cmake.mk: fix host ccache support for CMake 3.19

[Yann E. MORIN]

Bernd, All,

On 2020-12-12 23:52 +0100, Bernd Amend spake thusly:
> Starting with CMake 3.4 CMake supports setting a compiler launcher
> like ccache. The feature is described in
> https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_COMPILER_LAUNCHER.html
> This should be safe since everything is built for the host using make or ninja.
> The use of *_ARG1 is discouraged by the cmake developers
> https://cmake-developers.cmake.narkive.com/OTa9EKfj/cmake-c-compiler-arg-not-documented .
> 
> Without this patch I get the following error message with CMake 3.19.1 on Arch Linux.
> Disabling BR2_CCACHE also resolves the issue.
> 
> /usr/bin/cmake [~]/buildroot/build/host-lzo-2.10/ -DCMAKE_INSTALL_SO_NO_EXE=0 -DCMAKE_FIND_ROOT_PATH="[...]" -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM="BOTH" -DCMAKE_FIND_ROOT_P
> ATH_MODE_LIBRARY="BOTH" -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE="BOTH" -DCMAKE_INSTALL_PREFIX="[...]" -DCMAKE_C_FLAGS="-O2 -I[...]/include" -DCMAKE_CXX_FLAGS="-O2 -I[...]/include" -DCMAKE_EXE_LINKER_FLAGS="-L[...]/lib -Wl,-rpath,[...]/lib" -DCMAKE_SHARED_LINKER_FLAGS="-L[...]/l
> ib -Wl,-rpath,[...]/lib" -DCMAKE_ASM_COMPILER="/usr/bin/as" -DCMAKE_C_COMPILER="[...]/bin/ccache" -DCMAKE_CXX_COMPILER="[...]/bin/ccache"
> -DCMAKE_C_COMPILER_ARG1="/usr/bin/gcc" -DCMAKE_CXX_COMPILER_ARG1="/usr/bin/g++"  -DCMAKE_COLOR_MAKEFILE=OFF -DBUILD_DOC=OFF -DBUILD_DOCS=OFF -DBUILD_EXAMPLE=OFF -DBUILD_EXAMPLES=OFF -DBUILD_TEST=OFF -DBUILD_TESTS=OFF -DBUILD_TESTING=O
> FF  -DENABLE_SHARED=ON -DENABLE_STATIC=OFF )
> -- The C compiler identification is unknown
> -- Detecting C compiler ABI info
> -- Detecting C compiler ABI info - failed
> -- Check for working C compiler: [...]/bin/ccache
> -- Check for working C compiler: [...]/bin/ccache - broken
> CMake Error at /usr/share/cmake-3.19/Modules/CMakeTestCCompiler.cmake:66 (message):
> The C compiler
> 
> Signed-off-by: Bernd Amend <bernd.amend at gmail.com>

Applied to master, thanks!

Regards,
Yann E. MORIN.

> ---
>  package/pkg-cmake.mk | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/package/pkg-cmake.mk b/package/pkg-cmake.mk
> index dc545caed9..3ee7067250 100644
> --- a/package/pkg-cmake.mk
> +++ b/package/pkg-cmake.mk
> @@ -22,10 +22,10 @@
>  
>  # Set compiler variables.
>  ifeq ($(BR2_CCACHE),y)
> -CMAKE_HOST_C_COMPILER = $(HOST_DIR)/bin/ccache
> -CMAKE_HOST_CXX_COMPILER = $(HOST_DIR)/bin/ccache
> -CMAKE_HOST_C_COMPILER_ARG1 = $(HOSTCC_NOCCACHE)
> -CMAKE_HOST_CXX_COMPILER_ARG1 = $(HOSTCXX_NOCCACHE)
> +CMAKE_HOST_C_COMPILER = $(HOSTCC_NOCCACHE)
> +CMAKE_HOST_CXX_COMPILER = $(HOSTCXX_NOCCACHE)
> +CMAKE_HOST_C_COMPILER_LAUNCHER = $(HOST_DIR)/bin/ccache
> +CMAKE_HOST_CXX_COMPILER_LAUNCHER = $(HOST_DIR)/bin/ccache
>  else
>  CMAKE_HOST_C_COMPILER = $(HOSTCC)
>  CMAKE_HOST_CXX_COMPILER = $(HOSTCXX)
> @@ -134,9 +134,9 @@ define $(2)_CONFIGURE_CMDS
>  		-DCMAKE_ASM_COMPILER="$$(HOSTAS)" \
>  		-DCMAKE_C_COMPILER="$$(CMAKE_HOST_C_COMPILER)" \
>  		-DCMAKE_CXX_COMPILER="$$(CMAKE_HOST_CXX_COMPILER)" \
> -		$(if $$(CMAKE_HOST_C_COMPILER_ARG1),\
> -			-DCMAKE_C_COMPILER_ARG1="$$(CMAKE_HOST_C_COMPILER_ARG1)" \
> -			-DCMAKE_CXX_COMPILER_ARG1="$$(CMAKE_HOST_CXX_COMPILER_ARG1)" \
> +		$(if $$(CMAKE_HOST_C_COMPILER_LAUNCHER),\
> +			-DCMAKE_C_COMPILER_LAUNCHER="$$(CMAKE_HOST_C_COMPILER_LAUNCHER)" \
> +			-DCMAKE_CXX_COMPILER_LAUNCHER="$$(CMAKE_HOST_CXX_COMPILER_LAUNCHER)" \
>  		) \
>  		-DCMAKE_COLOR_MAKEFILE=OFF \
>  		-DBUILD_DOC=OFF \
> -- 
> 2.29.2
> 
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