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Only link with libm (-lm) if necessary.

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This fixes warnings when building with MSVC.
This commit is contained in:
Jason Evans 2016-10-27 21:23:48 -07:00
parent c44fa92db5
commit d76cfec319
2 changed files with 16 additions and 6 deletions
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15
configure.ac
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@ -494,6 +494,15 @@ AC_SUBST([ARFLAGS])
AC_SUBST([AROUT])
AC_SUBST([CC_MM])
dnl Determine whether libm must be linked to use e.g. log(3).
AC_SEARCH_LIBS([log], [m], , [AC_MSG_ERROR([Missing math functions])])
if test "x$ac_cv_search_log" != "xnone required" ; then
LM="$ac_cv_search_log"
else
LM=
fi
AC_SUBST(LM)
JE_COMPILABLE([__attribute__ syntax],
[static __attribute__((unused)) void foo(void){}],
[],
@ -940,9 +949,9 @@ fi
AC_MSG_CHECKING([configured backtracing method])
AC_MSG_RESULT([$backtrace_method])
if test "x$enable_prof" = "x1" ; then
if test "x$abi" != "xpecoff"; then
dnl Heap profiling uses the log(3) function.
LIBS="$LIBS -lm"
dnl Heap profiling uses the log(3) function.
if test "x$LM" != "x" ; then
LIBS="$LIBS $LM"
fi
AC_DEFINE([JEMALLOC_PROF], [ ])