Merge pull request #170 from PJK/lm

Explicitly link math library
PJK · Nov 27, 2020 · 0741dd4 · 0741dd4
2 parents 14abd14 + 08625bc
commit 0741dd4
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,6 +1,7 @@
 Next
 ---------------------
 - Improved pkg-config paths handling [[#164]](https://github.com/PJK/libcbor/pull/164) (by [jtojnar@](https://github.com/jtojnar))
+- Use explicit math.h linkage [[#170]](https://github.com/PJK/libcbor/pull/170)
 
 0.8.0 (2020-09-20)
 ---------------------

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
@@ -2,6 +2,7 @@ set(SOURCES cbor.c cbor/streaming.c cbor/internal/encoders.c cbor/internal/build
 
 include(GNUInstallDirs)
 include(JoinPaths)
+include(CheckFunctionExists)
 set(CMAKE_SKIP_BUILD_RPATH FALSE)
 
 if (CBOR_CUSTOM_ALLOC)
@@ -15,6 +16,12 @@ endif()
 add_library(cbor ${SOURCES})
 target_include_directories(cbor PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
+# Explicitly link math.h if necessary
+check_function_exists(ldexp LDEXP_AVAILABLE)
+if (NOT LDEXP_AVAILABLE)
+	target_link_libraries(cbor m)
+endif()
+
 include(GenerateExportHeader)
 generate_export_header(cbor EXPORT_FILE_NAME ${CMAKE_CURRENT_BINARY_DIR}/cbor/cbor_export.h)
 target_include_directories(cbor PUBLIC ${CMAKE_CURRENT_BINARY_DIR})