CMakeLists.txt: allow building without a C++ compiler #872
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I'm not a maintainer but this seems fine with me in general, just one comment added.
We have one example hiredis-example-qt that requires C++, but this is not (currently) included in the CMake build.
Maybe this can be handled with CMakes enable_language when the time comes.
Sorry, this was already mentioned, maybe I should start to read everything :)
| @@ -1,6 +1,5 @@ | |||
| CMAKE_MINIMUM_REQUIRED(VERSION 3.4.0) | |||
| INCLUDE(GNUInstallDirs) | |||
| PROJECT(hiredis) | |||
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Instead of removing this line I would like to have a
PROJECT(hiredis LANGUAGES "C")
before
INCLUDE(GNUInstallDirs)
since GNUInstallDirs needs a language to be set:
CMake Warning (dev) at /snap/cmake/580/share/cmake-3.17/Modules/GNUInstallDirs.cmake:225 (message):
Unable to determine default CMAKE_INSTALL_LIBDIR directory because no
target architecture is known. Please enable at least one language before
including GNUInstallDirs.
Call Stack (most recent call first):
CMakeLists.txt:2 (INCLUDE)
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Thanks for your review, I updated the PR to move INCLUDE(GNUInstallDirs) after the PROJECT statement.
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Ah yes, even better! The provided CMAKE_INSTALL_ variables weren't needed until the install section a bit later..
Define hiredis as a C project (and use a single PROJECT statement) to
avoid the following build failure if a C++ compiler is not found:
CMake Error at CMakeLists.txt:3 (PROJECT):
The CMAKE_CXX_COMPILER:
/srv/storage/autobuild/run/instance-1/output-1/host/bin/arm-linux-g++
is not a full path to an existing compiler tool.
Tell CMake where to find the compiler by setting either the environment
variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
to the compiler, or to the compiler name if it is in the PATH.
The only cpp source file is examples/example-qt.cpp which is never
compiled with cmake buildsystem. This file is compiled only with the
Makefile buildsystem so perhaps it should be removed. If it is added to
the cmake buildsystem, a call to enable_language(CXX) will have to be
added.
Fixes:
- http://autobuild.buildroot.org/results/830ec3398cd29b9fc5cde06a225ef531d7a9d850
Signed-off-by: Fabrice Fontaine <[email protected]>
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Thank you for the review @bjosv I'll get this merged over the weekend. The issue with cmake fixes is that I'm not very familiar with it. |
Define hiredis as a C project (and use a single
PROJECTstatement) toavoid the following build failure if a C++ compiler is not found:
The only cpp source file is examples/example-qt.cpp which is never
compiled with cmake buildsystem. This file is compiled only with the
Makefile buildsystem so perhaps it should be removed. If it is added to
the cmake buildsystem, a call to
enable_language(CXX)will have to beadded.
Fixes:
Signed-off-by: Fabrice Fontaine [email protected]