Cannot open include file: 'tommath.h'

[naushadck]

Hello,

Unable to build. It throws the following error.

Error C1083 Cannot open include file: 'tommath.h': No such file or directory libtomcrypt

cmake build error

Could not find a package configuration file provided by "libtommath"
(requested version 1.2.0) with any of the following names:

libtommathConfig.cmake
libtommath-config.cmake

[sjaeckel]

If you want to use libtommath, you have to have it available on the system you're building libtomcrypt.

Either install libtommath via your package manager or you could also clone the libtommath repository and build it via CMake, which will in turn add that build to your local CMake registry.

[levitte]

Note that the package managers probably don't build using CMake (I know for a fact that the Debian package doesn't), which means that you won't get libtommathConfig.cmake with it. It's appropriate to fall back to using pkg-config.

I've a package that does exactly this for libtomcrypt:

find_package(libtomcrypt QUIET)
if (libtomcrypt_FOUND)
  set(LIBTOMCRYPT libtomcrypt)
else()
  find_package(PkgConfig)
  pkg_check_modules(libtomcrypt REQUIRED IMPORTED_TARGET libtomcrypt)
  set(LIBTOMCRYPT PkgConfig::libtomcrypt)
endif()

[sjaeckel]

find_package(libtomcrypt QUIET)
if (libtomcrypt_FOUND)
set(LIBTOMCRYPT libtomcrypt)
else()
find_package(PkgConfig)
pkg_check_modules(libtomcrypt REQUIRED IMPORTED_TARGET libtomcrypt)
set(LIBTOMCRYPT PkgConfig::libtomcrypt)
endif()

Would it maybe make sense to have this snippet somewhere available?

[levitte]

Perhaps. Not sure where, though... Application writer documentation or something like that?

[sjaeckel]

How about adding that snippet as a new file contrib/libtomcrypt.cmake (or something like that) and then writing a small paragraph in doc/crypt.tex under the section "Building with CMake"? If you have the time, feel free to simply push that to the branch of #683

[levitte]

Okie, good thoughts. Coming up!

[levitte]

Done. I made it a separate section, since that's not about building libtomcrypt itself.