CMakeLists: Fix detection of libm
Only use libm on Unix and Unix-like systems, except for Apple (where
it's unnecessary), and BeOS and Haiku (where it's unavailable).
Avoid searching for libm at explicit locations. They may be incorrect,
especially for cross-platform builds.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a49127d..58332a8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,16 +59,10 @@
include_directories(${ZLIB_INCLUDE_DIR})
endif()
-if(NOT WIN32)
- find_library(M_LIBRARY
- NAMES m
- PATHS /usr/lib /usr/local/lib)
- if(NOT M_LIBRARY)
- message(STATUS "math lib 'libm' not found; floating point support disabled")
- set(M_LIBRARY "")
- endif()
+if(UNIX AND NOT APPLE AND NOT BEOS AND NOT HAIKU)
+ find_library(M_LIBRARY m)
else()
- # not needed on windows
+ # libm is not needed and/or not available
set(M_LIBRARY "")
endif()
