From aea49a24c79cb6fd4ade8861ebc6e675d74f1c57 Mon Sep 17 00:00:00 2001
From: Julien Schueller <schueller@phimeca.com>
Date: Fri, 4 Nov 2016 09:55:31 +0100
Subject: [PATCH] Detect libm

---
 CMakeLists.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ddcaa06..e50f3be 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,6 +72,7 @@ include (CheckTypeSize)
 include (CheckCCompilerFlag)
 include (CheckCXXSymbolExists)
 include (CheckCXXCompilerFlag)
+include (CheckLibraryExists)
 
 #==============================================================================
 # COMPILATION CHECKINGS and CONFIGURATION GENERATION
@@ -105,6 +106,11 @@ set (HAVE_UINT32_T ${SIZEOF_UINT32_T})
 check_type_size ("unsigned int" SIZEOF_UNSIGNED_INT)
 check_type_size ("unsigned long" SIZEOF_UNSIGNED_LONG)
 
+check_library_exists ("m" sqrt "" HAVE_LIBM)
+if (HAVE_LIBM)
+  set (M_LIBRARY m)
+endif()
+
 if (NOT DEFINED HAVE_FPCLASSIFY)
   message(STATUS "Looking for fpclassify")
   file (WRITE ${CMAKE_BINARY_DIR}/fpclassify.c "#include <math.h>\n")
@@ -234,6 +240,8 @@ install (FILES ${NLOPT_HEADERS} DESTINATION ${INSTALL_INCLUDE_DIR})
 
 set (nlopt_lib nlopt${NLOPT_SUFFIX})
 add_library (${nlopt_lib} ${NLOPT_SOURCES})
+target_link_libraries (${nlopt_lib} ${M_LIBRARY})
+
 set_target_properties (${nlopt_lib} PROPERTIES SOVERSION 0)
 set_target_properties (${nlopt_lib} PROPERTIES VERSION 0.9.0)
 
-- 
2.30.2