undefine([AC_CV_NAME_supported])dnl
])
+
+# FP_CHECK_FUNC(FUNCTION, PROLOGUE, BODY, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+# ---------------------------------------------------------------------------------
+# A variant of AC_CHECK_FUNCS, limited to a single FUNCTION, but with the
+# additional flexibility of specifying the PROLOGUE and BODY.
+AC_DEFUN([FP_CHECK_FUNC],
+[AS_VAR_PUSHDEF([fp_func], [fp_cv_func_$1])dnl
+AC_CACHE_CHECK([for $1], fp_func,
+[AC_LINK_IFELSE([AC_LANG_PROGRAM([$2], [$3])],
+ [AS_VAR_SET(fp_func, yes)],
+ [AS_VAR_SET(fp_func, no)])])
+AS_IF([test AS_VAR_GET(fp_func) = yes],
+ [AC_DEFINE(AS_TR_CPP(HAVE_$1), [1],
+ [Define to 1 if you have the `]$1[' function.]) $4],
+ [$5])dnl
+AS_VAR_POPDEF([fp_func])dnl
+])# FP_CHECK_FUNC
+
+
dnl Based on AC_TRY_LINK - run iftrue if links cleanly with no warning
dnl FPTOOLS_TRY_LINK_NOWARN(flags,main?,iftrue,iffalse)
esac
if test x"$use_quartz_opengl" != xyes; then
- AC_CHECK_LIB([m], [main], [GL_LIBS="-lm $GL_LIBS"])
+ AC_CHECK_LIB([m], [atan], [GL_LIBS="-lm $GL_LIBS"])
if test x"$no_x" != xyes; then
test -n "$x_includes" && GL_CFLAGS="-I$x_includes $GL_CFLAGS"
test -n "$x_libraries" && GL_LIBS="-L$x_libraries -lX11 $GL_LIBS"
fi
- FP_CHECK_GL_HELPER([GL], [-lopengl32 -lGL], [@%:@include <GL/gl.h>], [glEnd()])
+ FP_CHECK_GL_HELPER([GL], [-lGL -lopengl32], [@%:@include <GL/gl.h>], [glEnd()])
+
+ if test x"$no_GL" != xyes; then
+ # Ugly: To get wglGetProcAddress on Windows, we have to link with
+ # opengl32.dll, too, even when we are using Cygwin with X11.
+ case "$GL_LIBS" in
+ *-lopengl32*|*opengl32.lib*) ;;
+ *) fp_save_LIBS="$LIBS"
+ LIBS="$LIBS -lopengl32"
+ AC_TRY_LINK([@%:@include <GL/gl.h>], [glEnd()],
+ [GL_LIBS="$GL_LIBS -lopengl32"; GL_LIBS0="$GL_LIBS0 -lopengl32"])
+ LIBS="$fp_save_LIBS"
+ ;;
+ esac
+ fi
fi
fi