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| author | Zack Weinberg <zackw@panix.com> | 2020-11-01 19:23:12 -0500 |
|---|---|---|
| committer | Zack Weinberg <zackw@panix.com> | 2020-11-01 19:51:47 -0500 |
| commit | 33c3a47c04ab70a4dd54963fe433a171bc03747f (patch) | |
| tree | 906b142092f4fcaeacf0d4ae05d0c9fe31809b85 /NEWS | |
| parent | bf19f95cf4766c8a22583dfdbbbbc67a97c4b6b0 (diff) | |
| download | autoconf-33c3a47c04ab70a4dd54963fe433a171bc03747f.tar.gz | |
Don’t search for X11 when cross compiling (#110345)
This is undesirable because X11 development headers and libraries
found by searching /usr are much more likely to belong to the build
operating system than the host operating system (being cross-compiled
for). A particularly problematic case, from the original bug report,
is “using a sysroot where the target is binary compatible with the
host. In this case AC_PATH_X will happily look at /usr and say that
yes, X is available, even if the sysroot doesn't have X.”
To cross-compile X client applications, the recommended procedure is
to put X11 headers and libraries for the host system in the cross
compiler’s default search path; alternatively, --x-includes and
--x-libraries can be used.
Fixes bug #110345. Problem reported by Ross Burton.
* lib/autoconf/libs.m4 (_AC_PATH_X): Before doing anything else,
see whether a test compilation with no special options (just -lX11)
will work. If it doesn’t, only invoke _AC_PATH_X_XMKMF and
_AC_PATH_X_DIRECT when not cross compiling.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 11 |
1 files changed, 11 insertions, 0 deletions
@@ -329,6 +329,17 @@ GNU Autoconf NEWS - User visible changes. *** AC_CHECK_DECL and AC_CHECK_DECLS will now detect missing declarations for library functions that are also Clang compiler builtins. +*** AC_PATH_X and AC_PATH_XTRA don’t search for X11 when cross-compiling. + + Libraries and headers found by running xmkmf or searching /usr/X11, + /usr/X11R7, etc. are likely to belong to a native X11 installation + for the build machine and to be inappropriate for cross compilation. + + To cross-compile programs that require X11, we recommend putting the + headers and libraries for the host system in your cross-compiler’s + default search paths. Alternatively, use configure’s --x-includes + and --x-libraries command line options to tell it where they are. + *** AC_PROG_CC is now defined via AC_DEFUN_ONCE. This means configure scripts will no longer check repeatedly for the |