1 files changed, 43 insertions, 0 deletions
diff --git a/tiff/cmake/SymbolChecks.cmake b/tiff/cmake/SymbolChecks.cmake
new file mode 100644
index 00000000..210748ed
--- /dev/null
+++ b/tiff/cmake/SymbolChecks.cmake
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+# Checks for symbols
+#
+# Copyright © 2015 Open Microscopy Environment / University of Dundee
+# Copyright © 2021 Roger Leigh <rleigh@codelibre.net>
+# Written by Roger Leigh <rleigh@codelibre.net>
+#
+# Permission to use, copy, modify, distribute, and sell this software and
+# its documentation for any purpose is hereby granted without fee, provided
+# that (i) the above copyright notices and this permission notice appear in
+# all copies of the software and related documentation, and (ii) the names of
+# Sam Leffler and Silicon Graphics may not be used in any advertising or
+# publicity relating to the software without the specific, prior written
+# permission of Sam Leffler and Silicon Graphics.
+#
+# THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+# WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+#
+# IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
+# ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+# OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+# LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+
+
+include(CheckSymbolExists)
+
+
+# Check for getopt
+check_symbol_exists(getopt "unistd.h;stdio.h" HAVE_GETOPT)
+check_symbol_exists(optarg "getopt.h" HAVE_DECL_OPTARG)
+if (HAVE_DECL_OPTARG)
+    set(HAVE_DECL_OPTARG 1)
+else()
+    set(HAVE_DECL_OPTARG 0)
+endif()
+
+# Check for mmap
+check_symbol_exists(mmap "sys/mman.h" HAVE_MMAP)
+
+# Check for setmode
+check_symbol_exists(setmode "unistd.h" HAVE_SETMODE)