Please dont hard code compiler paths about box86

[Rippanda12]

cmake tells users how to set the compiler if it doesnt find it

CMake Error at CMakeLists.txt:92 (project):
  The CMAKE_C_COMPILER:

    arm-linux-gnueabihf-gcc

  is not a full path and was not found in the PATH.

  Tell CMake where to find the compiler by setting either the environment
  variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
  the compiler, or to the compiler name if it is in the PATH.


CMake Error at CMakeLists.txt:92 (project):
  No CMAKE_ASM_COMPILER could be found.

  Tell CMake where to find the compiler by setting either the environment
  variable "ASM" or the CMake cache entry CMAKE_ASM_COMPILER to the full path
  to the compiler, or to the compiler name if it is in the PATH.

[ptitSeb]

THis bit is crucial for arm64 build, for it to be plug'n play.

[Rippanda12]

Same here but I can't compile without patching your thing

[Rippanda12]

Not every GCC compiler has the same triple name.
The one I'm compiling uses armv7h-linux-gnueabihf, now I have to patch so that I can build.
Is it too much to ask from people to adhere to standards instead of hardcoding stuff in?
This is the same with what I experienced with X11 libs, most of them have hard coded paths (look here https://github.com/BredOS/multilib-pkgbuilds, under patches/).

This is how cross compilation should be done
https://github.com/BredOS/multilib-pkgbuilds/blob/main/patches%2Flib32-llvm.patch#L32

Atleast do checks first. Cmake supports those.
User defined Cc CXX should be respected at all costs.

[ptitSeb]

but those patch are Arch OS specific. The point is to have box86 buildable everywhere. Currently, most machine still use debian based OS (Debian, Ubuntu, Armbian), and this works perfectly, without the need to use a shell script. Note that this is not really cross-compiling, it' build on the devices directly.

If you find a solution to make this parametrable without breaking debian compatibility, I'm all hears.

Last time I tried, cmake was not not happy and needed the settings of the C compiler very early in the CMake Script, but maybe there is a simpler way?

[Rippanda12]

set(COMPILER_TRIPLE arm-linux-gnueabihf-gcc)
find_program(COMPILER_FOUND ${COMPILER_TRIPLE})

if(COMPILER_FOUND)
    set(CMAKE_C_COMPILER ${COMPILER_FOUND})
else()
    message(STATUS "Cross compiler ${COMPILER_TRIPLE} not found, using CC or -DCMAKE_C_COMPILER")
endif()

Edit: this is the actual fix

[ptitSeb]

Ok, looks good to me.

Out of curiosity, is set(COMPILER_TRIPLE arm-linux-gnueabihf-gcc) overloadable? Or does cmake has some specific test that allows it to goes from "arm-linux-gnueabihf-gcc" the actual armhf triplet actually setup in the system?

[Rippanda12]

its still hard coded in a way, checks for that toolchain, if it exists sets it and uses it else uses either /usr/bin/gcc OR in the case of most crosscompilations, CC var or if user specified -DCMAKE_C_COMPILER

[ptitSeb]

Ah ok, this allows to use fallback instead of just failing. Nice.