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Diffstat (limited to 'm4/canonicalize.m4')
| -rw-r--r-- | m4/canonicalize.m4 | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/m4/canonicalize.m4 b/m4/canonicalize.m4 new file mode 100644 index 0000000..bdc5c8f --- /dev/null +++ b/m4/canonicalize.m4 @@ -0,0 +1,133 @@ +# canonicalize.m4 serial 31 + +dnl Copyright (C) 2003-2007, 2009-2020 Free Software Foundation, Inc. + +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +# Provides canonicalize_file_name and canonicalize_filename_mode, but does +# not provide or fix realpath. +AC_DEFUN([gl_FUNC_CANONICALIZE_FILENAME_MODE], +[ + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + AC_CHECK_FUNCS_ONCE([canonicalize_file_name]) + AC_REQUIRE([gl_DOUBLE_SLASH_ROOT]) + AC_REQUIRE([gl_FUNC_REALPATH_WORKS]) + if test $ac_cv_func_canonicalize_file_name = no; then + HAVE_CANONICALIZE_FILE_NAME=0 + else + case "$gl_cv_func_realpath_works" in + *yes) ;; + *) REPLACE_CANONICALIZE_FILE_NAME=1 ;; + esac + fi +]) + +# Provides canonicalize_file_name and realpath. +AC_DEFUN([gl_CANONICALIZE_LGPL], +[ + AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) + AC_REQUIRE([gl_CANONICALIZE_LGPL_SEPARATE]) + if test $ac_cv_func_canonicalize_file_name = no; then + HAVE_CANONICALIZE_FILE_NAME=0 + if test $ac_cv_func_realpath = no; then + HAVE_REALPATH=0 + else + case "$gl_cv_func_realpath_works" in + *yes) ;; + *) REPLACE_REALPATH=1 ;; + esac + fi + else + case "$gl_cv_func_realpath_works" in + *yes) + ;; + *) + REPLACE_CANONICALIZE_FILE_NAME=1 + REPLACE_REALPATH=1 + ;; + esac + fi +]) + +# Like gl_CANONICALIZE_LGPL, except prepare for separate compilation +# (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ). +AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE], +[ + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + AC_CHECK_FUNCS_ONCE([canonicalize_file_name getcwd readlink]) + AC_REQUIRE([gl_DOUBLE_SLASH_ROOT]) + AC_REQUIRE([gl_FUNC_REALPATH_WORKS]) + AC_CHECK_HEADERS_ONCE([sys/param.h]) +]) + +# Check whether realpath works. Assume that if a platform has both +# realpath and canonicalize_file_name, but the former is broken, then +# so is the latter. +AC_DEFUN([gl_FUNC_REALPATH_WORKS], +[ + AC_CHECK_FUNCS_ONCE([realpath]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [ + touch conftest.a + mkdir conftest.d + AC_RUN_IFELSE([ + AC_LANG_PROGRAM([[ + ]GL_NOCRASH[ + #include <stdlib.h> + #include <string.h> + ]], [[ + int result = 0; + { + char *name = realpath ("conftest.a", NULL); + if (!(name && *name == '/')) + result |= 1; + free (name); + } + { + char *name = realpath ("conftest.b/../conftest.a", NULL); + if (name != NULL) + result |= 2; + free (name); + } + { + char *name = realpath ("conftest.a/", NULL); + if (name != NULL) + result |= 4; + free (name); + } + { + char *name1 = realpath (".", NULL); + char *name2 = realpath ("conftest.d//./..", NULL); + if (! name1 || ! name2 || strcmp (name1, name2)) + result |= 8; + free (name1); + free (name2); + } + return result; + ]]) + ], + [gl_cv_func_realpath_works=yes], + [gl_cv_func_realpath_works=no], + [case "$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 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="$gl_cross_guess_normal" ;; + esac + ]) + rm -rf conftest.a conftest.d + ]) + case "$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.]) + ;; + esac +]) |