[ARROW-5192] [C++] Bundled gRPC fails building (cannot find c-ares)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/21668
• Assignee: Unassigned
• Reporter: Antoine Pitrou
• Created: 22/Apr/19 15:56
• Updated: 11/Jan/23 07:38
• Resolved: 12/Jan/21 17:41

Description

If I try to build Arrow C++ without a conda toolchain, I get the following error when gRPC is being built by the cmake files:

CMake Error at cmake/cares.cmake:38 (find_package):
  Could not find a package configuration file provided by "c-ares" with any
  of the following names:

    c-aresConfig.cmake
    c-ares-config.cmake

  Add the installation prefix of "c-ares" to CMAKE_PREFIX_PATH or set
  "c-ares_DIR" to a directory containing one of the above files.  If "c-ares"
  provides a separate development package or SDK, be sure it has been
  installed.
Call Stack (most recent call first):
  CMakeLists.txt:139 (include)

It seems c-ares is found by the following line in ThirdPartyToolchain.cmake:

find_package(c-aresAlt)

But gRPC doesn't pick it up...