summaryrefslogtreecommitdiff
path: root/m4/check-math-lib.m4
diff options
context:
space:
mode:
Diffstat (limited to 'm4/check-math-lib.m4')
-rw-r--r--m4/check-math-lib.m432
1 files changed, 32 insertions, 0 deletions
diff --git a/m4/check-math-lib.m4 b/m4/check-math-lib.m4
new file mode 100644
index 000000000..4c300e2c5
--- /dev/null
+++ b/m4/check-math-lib.m4
@@ -0,0 +1,32 @@
+# check-math-lib.m4 serial 4
+dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+dnl
+dnl gl_CHECK_MATH_LIB (VARIABLE, EXPRESSION [, EXTRA-CODE])
+dnl
+dnl Sets the shell VARIABLE according to the libraries needed by EXPRESSION
+dnl to compile and link: to the empty string if no extra libraries are needed,
+dnl to "-lm" if -lm is needed, or to "missing" if it does not compile and
+dnl link either way.
+dnl
+dnl Example: gl_CHECK_MATH_LIB([ROUNDF_LIBM], [x = roundf (x);])
+AC_DEFUN([gl_CHECK_MATH_LIB], [
+ save_LIBS=$LIBS
+ $1=missing
+ for libm in "" "-lm"; do
+ LIBS="$save_LIBS $libm"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+ #ifndef __NO_MATH_INLINES
+ # define __NO_MATH_INLINES 1 /* for glibc */
+ #endif
+ #include <math.h>
+ $3
+ double x;]],
+ [$2])],
+ [$1=$libm
+break])
+ done
+ LIBS=$save_LIBS
+])