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-rw-r--r--Build/source/m4/kpse-xpdf-flags.m448
1 files changed, 37 insertions, 11 deletions
diff --git a/Build/source/m4/kpse-xpdf-flags.m4 b/Build/source/m4/kpse-xpdf-flags.m4
index e2207b8ad5e..9e4f718f589 100644
--- a/Build/source/m4/kpse-xpdf-flags.m4
+++ b/Build/source/m4/kpse-xpdf-flags.m4
@@ -1,9 +1,29 @@
+# $Id$
# Public macros for the TeX Live (TL) tree.
-# Copyright (C) 2009-2015 Peter Breitenlohner <tex-live@tug.org>
+# Copyright 2015-2020 Karl Berry <tex-live@tug.org>
+# Copyright 2009-2015 Peter Breitenlohner <tex-live@tug.org>
#
# This file is free software; the copyright holder
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
+#
+# Support for our semi-homegrown libs/xpdf library. This is derived
+# from xpdf source code, but xpdf does not distribute it as a library.
+# It is used by pdftex (and nothing else) to read PDF images.
+# Other engines use the semi-homegrown pplib library (q.v.) for that.
+
+# The well-known poppler library is also originally derived from xpdf
+# source code, but has been greatly revised and extended. TL used to
+# (sort of) support poppler as the system xpdf, but after the TL 2020
+# release we dropped this, because we switched XeTeX to use pplib, and
+# nothing else used poppler. (No engines ever used poppler to generate
+# their PDF output).
+#
+# poppler is aggressively developed, with requirements for new compilers
+# and language versions. That's fine for them, but since we don't need
+# anything new, it has become too time-consuming and problematic to
+# continue to support it in the TL sources, when we don't have any
+# requirement for it.
# KPSE_XPDF_FLAGS
# ---------------
@@ -20,19 +40,25 @@ _KPSE_LIB_FLAGS([xpdf], [xpdf], [],
test "x$kpse_cv_have_win32" = xno || XPDF_LIBS="$XPDF_LIBS -lgdi32"
]) # KPSE_XPDF_FLAGS
-# KPSE_XPDF_OPTIONS([WITH-SYSTEM])
+# KPSE_XPDF_OPTIONS([WITH-SYSTEM]) -- as above, no more poppler.
+# Keep this macro's expansion as a valid shell command, though.
+# since it is used internally in the configure scripts.
# --------------------------------
-AC_DEFUN([KPSE_XPDF_OPTIONS],
-[m4_ifval([$1],
- [AC_ARG_WITH([system-xpdf],
- AS_HELP_STRING([--with-system-xpdf],
- [use installed poppler headers and library instead of xpdf library from TL (requires pkg-config)]))])[]dnl
+AC_DEFUN([KPSE_XPDF_OPTIONS], [dnl
+: "kpse_xpdf_options - no-op"
]) # KPSE_XPDF_OPTIONS
+dnl [m4_ifval([$1],
+dnl [AC_ARG_WITH([system-xpdf],
+dnl AS_HELP_STRING([--with-system-xpdf],
+dnl [use installed poppler headers and library instead of xpdf library from TL (requires pkg-config)]))])[]dnl
+dnl ]) # KPSE_XPDF_OPTIONS
-# KPSE_XPDF_SYSTEM_FLAGS
+# KPSE_XPDF_SYSTEM_FLAGS -- as above, no more poppler.
# ----------------------
AC_DEFUN([KPSE_XPDF_SYSTEM_FLAGS], [dnl
-_KPSE_PKG_CONFIG_FLAGS([xpdf], [poppler], [0.12])
-POPPLER_VERSION='-DPOPPLER_VERSION=\"'`$PKG_CONFIG poppler --modversion`'\"'
-XPDF_INCLUDES="$POPPLER_VERSION $XPDF_INCLUDES"
+: "kpse_xpdf_system_flags - no-op"
]) # KPSE_XPDF_SYSTEM_FLAGS
+dnl _KPSE_PKG_CONFIG_FLAGS([xpdf], [poppler], [0.12])
+dnl POPPLER_VERSION='-DPOPPLER_VERSION=\"'`$PKG_CONFIG poppler --modversion`'\"'
+dnl XPDF_INCLUDES="$POPPLER_VERSION $XPDF_INCLUDES"
+dnl ]) # KPSE_XPDF_SYSTEM_FLAGS