diff options
Diffstat (limited to 'm4/canonicalize.m4')
| -rw-r--r-- | m4/canonicalize.m4 | 60 |
1 files changed, 49 insertions, 11 deletions
diff --git a/m4/canonicalize.m4 b/m4/canonicalize.m4 index 475fa15d6bd..0dfb2da9a6a 100644 --- a/m4/canonicalize.m4 +++ b/m4/canonicalize.m4 @@ -1,4 +1,4 @@ -# canonicalize.m4 serial 35 +# canonicalize.m4 serial 37 dnl Copyright (C) 2003-2007, 2009-2021 Free Software Foundation, Inc. @@ -78,68 +78,106 @@ AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE], # so is the latter. AC_DEFUN([gl_FUNC_REALPATH_WORKS], [ - AC_CHECK_FUNCS_ONCE([realpath]) + AC_CHECK_FUNCS_ONCE([realpath lstat]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [ rm -rf conftest.a conftest.d touch conftest.a + # Assume that if we have lstat, we can also check symlinks. + if test $ac_cv_func_lstat = yes; then + ln -s conftest.a conftest.l + fi mkdir conftest.d AC_RUN_IFELSE([ AC_LANG_PROGRAM([[ ]GL_NOCRASH[ + #include <errno.h> #include <stdlib.h> #include <string.h> ]], [[ int result = 0; + /* This test fails on Solaris 10. */ { char *name = realpath ("conftest.a", NULL); if (!(name && *name == '/')) result |= 1; free (name); } + /* This test fails on older versions of Cygwin. */ { char *name = realpath ("conftest.b/../conftest.a", NULL); if (name != NULL) result |= 2; free (name); } + /* This test fails on Cygwin 2.9. */ + #if HAVE_LSTAT + { + char *name = realpath ("conftest.l/../conftest.a", NULL); + if (name != NULL || errno != ENOTDIR) + result |= 4; + free (name); + } + #endif + /* This test fails on Mac OS X 10.13, OpenBSD 6.0. */ { char *name = realpath ("conftest.a/", NULL); if (name != NULL) - result |= 4; + result |= 8; free (name); } + /* This test fails on AIX 7, Solaris 10. */ { char *name1 = realpath (".", NULL); char *name2 = realpath ("conftest.d//./..", NULL); if (! name1 || ! name2 || strcmp (name1, name2)) - result |= 8; + result |= 16; free (name1); free (name2); } + #ifdef __linux__ + /* On Linux, // is the same as /. See also double-slash-root.m4. + realpath() should respect this. + This test fails on musl libc 1.2.2. */ + { + char *name = realpath ("//", NULL); + if (! name || strcmp (name, "/")) + result |= 32; + free (name); + } + #endif return result; ]]) ], [gl_cv_func_realpath_works=yes], - [gl_cv_func_realpath_works=no], + [case $? in + 32) gl_cv_func_realpath_works=nearly ;; + *) gl_cv_func_realpath_works=no ;; + esac + ], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_realpath_works="guessing yes" ;; - # Guess yes on musl systems. - *-musl*) gl_cv_func_realpath_works="guessing yes" ;; + # Guess 'nearly' on musl systems. + *-musl*) gl_cv_func_realpath_works="guessing nearly" ;; + # Guess no on Cygwin. + cygwin*) gl_cv_func_realpath_works="guessing no" ;; # Guess no on native Windows. mingw*) gl_cv_func_realpath_works="guessing no" ;; # If we don't know, obey --enable-cross-guesses. *) gl_cv_func_realpath_works="$gl_cross_guess_normal" ;; esac ]) - rm -rf conftest.a conftest.d + rm -rf conftest.a conftest.l conftest.d ]) case "$gl_cv_func_realpath_works" in *yes) - AC_DEFINE([FUNC_REALPATH_WORKS], [1], [Define to 1 if realpath() - can malloc memory, always gives an absolute path, and handles - trailing slash correctly.]) + AC_DEFINE([FUNC_REALPATH_WORKS], [1], + [Define to 1 if realpath() can malloc memory, always gives an absolute path, and handles leading slashes and a trailing slash correctly.]) + ;; + *nearly) + AC_DEFINE([FUNC_REALPATH_NEARLY_WORKS], [1], + [Define to 1 if realpath() can malloc memory, always gives an absolute path, and handles a trailing slash correctly.]) ;; esac ]) |