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Add linker option -Wl,-no-undefined if supported (with configure check).

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Experimental. Thanks to Greg for finding this option.

If this option is supported by the linker, it is used when linking shared
libraries like libfltk_gl.so. With this option linking of the shared library
fails instead of postponing failure to linking programs with this library,
if any undefined references exist in this library. See STR #3191.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10582 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Albrecht Schlosser 2015-02-17 12:47:07 +00:00
parent 4d823c0d4a
commit 3fe71d118c
1 changed files with 12 additions and 0 deletions
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12
configure.in
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@ -1194,6 +1194,18 @@ if test -n "$GCC"; then
AC_MSG_RESULT(no))
CFLAGS="$OLDCFLAGS"
dnl Experimental (as of 17 Feb 2015):
dnl Make sure that shared libraries don't have undefined references
# See if ld supports -no-undefined...
AC_MSG_CHECKING(if ld supports -no-undefined)
OLDLDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,-no-undefined"
AC_TRY_LINK(,,
[DSOFLAGS="$DSOFLAGS -Wl,-no-undefined"]
AC_MSG_RESULT(yes),
AC_MSG_RESULT(no))
LDFLAGS="$OLDLDFLAGS"
# See if ld supports -Bsymbolic-functions...
AC_MSG_CHECKING(if ld supports -Bsymbolic-functions)
OLDLDFLAGS="$LDFLAGS"