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Diffstat (limited to 'recipes/cacao/files/libmath.patch')
| -rw-r--r-- | recipes/cacao/files/libmath.patch | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/recipes/cacao/files/libmath.patch b/recipes/cacao/files/libmath.patch new file mode 100644 index 0000000000..f8a4e837e2 --- /dev/null +++ b/recipes/cacao/files/libmath.patch @@ -0,0 +1,53 @@ +Index: cacao-0.98/configure.ac +=================================================================== +--- cacao-0.98.orig/configure.ac 2007-07-21 12:11:47.000000000 +0200 ++++ cacao-0.98/configure.ac 2007-07-21 13:36:40.000000000 +0200 +@@ -234,6 +234,48 @@ + AC_EGREP_HEADER(u_int32_t, sys/types.h, AC_DEFINE(HAVE_BSD_INT32_DEFINED, 1, [Define to 1 if you have BSD u_int32_t])) + AC_EGREP_HEADER(u_int32_t, sys/config.h, AC_DEFINE(HAVE_BSD_INT32_DEFINED, 1, [Define to 1 if you have BSD u_int32_t])) + ++dnl The idea of this solutions comes from bochs-project configure.in ++dnl ++dnl Add the -lm library if math functions cannot be used without it. ++dnl This check is important on cygwin because of the bizarre way that they ++dnl have organized functions into libraries. On cygwin, both libc.a and ++dnl libm.a are symbolic links to a single lib libcygwin.a. This means that ++dnl 1) linking with -lm is not necessary, and ++dnl 2) linking with -lm is dangerous if the order of libraries is wrong ++dnl In particular, if you compile any program with -mno-cygwin and link with ++dnl -lm, it will crash instantly when it is run. This happens because the ++dnl linker incorrectly links the Cygwin libm.a (==libcygwin.a), which replaces ++dnl the ___main function instead of allowing it to be defined by ++dnl /usr/lib/mingw/libmingw32.a as it should be. ++dnl ++dnl On MacOS X, this test will find that -lm is unnecessary and leave it out. ++dnl ++dnl With uClibc and without libjvm cacao needs to be linked with -lm because of ++dnl the function scalbn ++dnl ++dnl Just check this math functions. If it is found without ++dnl -lm, then we must not need -lm. ++have_scalbn=0 ++AC_CHECK_FUNCS(scalbn, have_scalbn=1) ++AC_MSG_CHECKING(if math functions link without -lm) ++if test "$have_scalbn" = 1; then ++ AC_MSG_RESULT(yes) ++else ++ AC_MSG_RESULT(no) ++ LIBS="$LIBS -lm" ++ # use different functions to bypass configure caching ++ have_scalbl=0 ++ AC_CHECK_FUNCS(scalbl, have_scalbl=1) ++ AC_MSG_CHECKING(if math functions link with -lm) ++ if test "$have_scalbl" = 1; then ++ AC_MSG_RESULT(yes) ++ else ++ AC_MSG_RESULT(no) ++ # not sure we should warn the user, crash, etc. ++ # expect link failure ++ fi ++fi ++ + dnl Checks for typedefs, structures, and compiler characteristics. + AC_C_CONST + AC_C_INLINE |