Compatibility for Homebrew Formula

[mhx]

First of all, thanks for this project! I've started using it (optionally, for now) in one of my projects.

While trying to build on macOS, I noticed that cpptrace isn't yet available in Homebrew. So I thought "how hard can it be" and started writing up a formula, which is currently on a dev branch.

While this works fine, there are a two issues:

1. ccache is currently a hard dependency. I believe the issue here is that if ccache happens to be installed, but it's not a dependency, then cmake will somehow find the ccache binary, but it won't be in the PATH while building. Making it a hard dependency will put ccache in the PATH. This should be fixed by fix: actually use ccache binary returned by find_program #184.
2. A more serious issue is that libdwarf (the formula is called dwarfutils in Homebrew) must be found via pkgconfig, as the formula doesn't installed a CMake config. This is fine for just building cpptrace, but when using cpptrace from another CMake project via find_package, the cpptrace::cpptrace target will try to link -ldwarf, which it doesn't find because it doesn't recall the linker search path from building cpptrace. This should be fixable by adding the original pkg_check_modules call to cpptrace-config-cmake.in and making sure the dependency is correctly resolved. Maybe you have a better idea.

[jeremy-rifkin]

Hello! Thank you for opening this and taking the time to look into a homebrew formula!

Regarding libdwarf, unfortunately I'm not sure the best solution. Even with cmake this stuff is a pain (at least for me). I think what you are suggesting sounds reasonable. The current code checks for a configuration option due to something I encountered when packaging the library for conda.

cpptrace/cmake/in/cpptrace-config-cmake.in

Lines 17 to 19 in 124dba5

	if(NOT @CPPTRACE_FIND_LIBDWARF_WITH_PKGCONFIG@)
	find_dependency(libdwarf REQUIRED)
	endif()

And easy and safe solution would be to add something similar to facilitate homebrew. Using pkg_check_modules in the config file any time pkg_check_modules is used in the CMakeLists.txt could also be correct though I'd want to test that locally.

P.s.: Nice project, I think I've heard of DwarFS before :)

[mhx]

And easy and safe solution would be to add something similar to facilitate homebrew. Using pkg_check_modules in the config file any time pkg_check_modules is used in the CMakeLists.txt could also be correct though I'd want to test that locally.

Cool, I'll see if I can play with this a bit and come up with a PR. I have the same problem in DwarFS and what I suggested is what worked for me.

P.s.: Nice project, I think I've heard of DwarFS before :)

Thanks! :)

cpptrace helped significantly in the investigation of a recent Windows-specific bug.