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Diffstat (limited to 'm4/ax_auto_include_headers.m4')
| -rw-r--r-- | m4/ax_auto_include_headers.m4 | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/m4/ax_auto_include_headers.m4 b/m4/ax_auto_include_headers.m4 new file mode 100644 index 0000000..36186a6 --- /dev/null +++ b/m4/ax_auto_include_headers.m4 @@ -0,0 +1,60 @@ +# =========================================================================== +# http://autoconf-archive.cryp.to/ax_auto_include_headers.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_AUTO_INCLUDE_HEADERS(INCLUDE-FILE ...) +# +# DESCRIPTION +# +# Given a space-separated list of INCLUDE-FILEs, AX_AUTO_INCLUDE_HEADERS +# will output a conditional #include for each INCLUDE-FILE. The following +# example demonstrates how AX_AUTO_INCLUDE_HEADERS's might be used in a +# configure.ac script: +# +# AH_BOTTOM([ +# AX_AUTO_INCLUDE_HEADERS([sys/resource.h invent.h sys/sysinfo.h])dnl +# ]) +# +# The preceding invocation instructs autoheader to put the following code +# at the bottom of the config.h file: +# +# #ifdef HAVE_SYS_RESOURCE_H +# # include <sys/resource.h> +# #endif +# #ifdef HAVE_INVENT_H +# # include <invent.h> +# #endif +# #ifdef HAVE_SYS_SYSINFO_H +# # include <sys/sysinfo.h> +# #endif +# +# Note that AX_AUTO_INCLUDE_HEADERS merely outputs #ifdef/#include/#endif +# blocks. The configure.ac script still needs to invoke AC_CHECK_HEADERS +# to #define the various HAVE_*_H preprocessor macros. +# +# Here's an easy way to get from config.h a complete list of header files +# who existence is tested by the configure script: +# +# cat config.h | perl -ane '/ HAVE_\S+_H / && do {$_=$F[$#F-1]; s/^HAVE_//; s/_H/.h/; s|_|/|g; tr/A-Z/a-z/; print "$_ "}' +# +# You can then manually edit the resulting list and incorporate it into +# one or more calls to AX_AUTO_INCLUDE_HEADERS. +# +# LICENSE +# +# Copyright (c) 2008 Scott Pakin <pakin@uiuc.edu> +# +# Copying and distribution of this file, with or without modification, are +# permitted in any medium without royalty provided the copyright notice +# and this notice are preserved. + +AC_DEFUN([AX_AUTO_INCLUDE_HEADERS], [dnl +AC_FOREACH([AX_Header], [$1], [dnl +m4_pushdef([AX_IfDef], AS_TR_CPP(HAVE_[]AX_Header))dnl +[#]ifdef AX_IfDef +[#] include <AX_Header> +[#]endif +m4_popdef([AX_IfDef])dnl +])]) |