Remove usage of cygwin_conv_path() under cygwin/msys

This converted Unix paths to Windows paths, but all cygwin tools
work with Unix paths so this shouldn't be needed.

There is one use case if you use a cygwin pkgconf with a non-cygwin toolchain,
but pkgconf works reasonable well natively now so this shouldn't be needed
anymore and more likely leads to problems and confusion.

Both cygwin and msys have patched this out already:
* https://cygwin.com/git-cygwin-packages/?p=git/cygwin-packages/pkgconf.git;a=blob;f=pkgconf.cygport;h=e5d003f3f3dfc9e374b916974018022ad8d68852;hb=HEAD#l55
* a4bce0c294/pkgconf/PKGBUILD (L26)

configure.ac

@@ -22,7 +22,7 @@ AX_CHECK_COMPILE_FLAG([-std=gnu99], [CFLAGS="$CFLAGS -std=gnu99"], [
 	AX_CHECK_COMPILE_FLAG([-std=c99], [CFLAGS="$CFLAGS -std=c99"])
 ])
 AC_CONFIG_HEADERS([libpkgconf/config.h])
-AC_CHECK_FUNCS([strlcpy strlcat strndup cygwin_conv_path])
+AC_CHECK_FUNCS([strlcpy strlcat strndup])
 AC_CHECK_HEADERS([sys/stat.h])
 AM_INIT_AUTOMAKE([foreign dist-xz subdir-objects])
 AM_SILENT_RULES([yes])

doc/libpkgconf-path.rst

@@ -55,7 +55,7 @@ variables.
 
 .. c:function:: bool pkgconf_path_relocate(char *buf, size_t buflen)
 
-   Relocates a path, possibly calling normpath() or cygwin_conv_path() on it.
+   Relocates a path, possibly calling normpath() on it.
 
    :param char* buf: The path to relocate.
    :param size_t buflen: The buffer length the path is contained in.

libpkgconf/config.h.meson

@@ -1,8 +1,5 @@
 /* libpkgconf/config.h.in.  Generated from configure.ac by autoheader.  */
 
-/* Define to 1 if you have the `cygwin_conv_path' function. */
-#mesondefine HAVE_CYGWIN_CONV_PATH
-
 /* Define to 1 if you have the `strlcat' function. */
 #mesondefine HAVE_STRLCAT
 

libpkgconf/path.c

@@ -17,10 +17,6 @@
 #include <libpkgconf/stdinc.h>
 #include <libpkgconf/libpkgconf.h>
 
-#ifdef HAVE_CYGWIN_CONV_PATH
-# include <sys/cygwin.h>
-#endif
-
 #if defined(HAVE_SYS_STAT_H) && ! defined(_WIN32)
 # include <sys/stat.h>
 # define PKGCONF_CACHE_INODES
@@ -306,7 +302,7 @@ normpath(const char *path)
  *
  * .. c:function:: bool pkgconf_path_relocate(char *buf, size_t buflen)
  *
- *    Relocates a path, possibly calling normpath() or cygwin_conv_path() on it.
+ *    Relocates a path, possibly calling normpath() on it.
  *
  *    :param char* buf: The path to relocate.
  *    :param size_t buflen: The buffer length the path is contained in.
@@ -320,25 +316,6 @@ pkgconf_path_relocate(char *buf, size_t buflen)
 	char *ti;
 #endif
 
-#ifdef HAVE_CYGWIN_CONV_PATH
-	/*
-	 * If we are on Cygwin or MSYS, then we want to convert the virtual path
-	 * to a real DOS path, using cygwin_conv_path().
-	 */
-	ssize_t size;
-	char *tmpbuf;
-
-	size = cygwin_conv_path(CCP_POSIX_TO_WIN_A, buf, NULL, 0);
-	if (size < 0 || (size_t) size > buflen)
-		return false;
-
-	tmpbuf = malloc(size);
-	if (cygwin_conv_path(CCP_POSIX_TO_WIN_A, buf, tmpbuf, size))
-		return false;
-
-	pkgconf_strlcpy(buf, tmpbuf, buflen);
-	free(tmpbuf);
-#else
 	char *tmpbuf;
 
 	if ((tmpbuf = normpath(buf)) != NULL)
@@ -353,7 +330,6 @@ pkgconf_path_relocate(char *buf, size_t buflen)
 		pkgconf_strlcpy(buf, tmpbuf, buflen);
 		free(tmpbuf);
 	}
-#endif
 
 #ifdef _WIN32
 	/*

meson.build

@@ -10,7 +10,6 @@ cc = meson.get_compiler('c')
 cdata = configuration_data()
 
 check_functions = [
-  ['HAVE_CYGWIN_CONV_PATH', 'cygwin_conv_path', 'sys/cygwin.h'],
   ['HAVE_STRLCAT', 'strlcat', 'string.h'],
   ['HAVE_STRLCPY', 'strlcpy', 'string.h'],
   ['HAVE_STRNDUP', 'strndup', 'string.h'],

tests/test_env.sh.in

@@ -26,7 +26,6 @@ LIBRARY_PATH_ENV="LIBRARY_PATH"
 PATH_SEP=":"
 SYSROOT_DIR="${selfdir}/test"
 case "$(uname -s)" in
-Msys|CYGWIN*) PATH_SEP=";";;
 Haiku) LIBRARY_PATH_ENV="BELIBRARIES";;
 esac