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cmake: use check_symbol_exists for browse support

Browse Source 
Just because `unistd.h` exists does not mean it has the APIs that are
needed. This occurs when cross-compiling using Fedora's packaged MinGW
toolchain.
This commit is contained in:
Ben Boeckel 2021-06-02 11:08:10 -04:00
parent c573f6b8b2
commit 54c5759471
1 changed files with 10 additions and 5 deletions
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15
CMakeLists.txt
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@ -1,6 +1,6 @@
cmake_minimum_required(VERSION 3.15)
include(CheckIncludeFileCXX)
include(CheckSymbolExists)
include(CheckIPOSupported)
project(ninja)
@ -73,10 +73,15 @@ function(check_platform_supports_browse_mode RESULT)
endif()
# Now check availability of the unistd header
check_include_file_cxx(unistd.h PLATFORM_HAS_UNISTD_HEADER)
set(${RESULT} "${PLATFORM_HAS_UNISTD_HEADER}" PARENT_SCOPE)
if(NOT PLATFORM_HAS_UNISTD_HEADER)
message(WARNING "browse feature omitted due to missing unistd.h")
check_symbol_exists(fork "unistd.h" HAVE_FORK)
check_symbol_exists(pipe "unistd.h" HAVE_PIPE)
set(browse_supported 0)
if (HAVE_FORK AND HAVE_PIPE)
set(browse_supported 1)
endif ()
set(${RESULT} "${browse_supported}" PARENT_SCOPE)
if(NOT browse_supported)
message(WARNING "browse feature omitted due to missing `fork` and `pipe` functions")
endif()
endfunction()