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On glibc systems, argp is provided by libc. However, on
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uclibc and other systems which lack argp in their C library,
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argp might be provided by a stand alone library, libargp.
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This patch adds tests to the build system to find who provides
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argp.
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X-Gentoo-Bug: 292191
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X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=292191
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Reported-by: Ed Wildgoose <gentoo@wildgooses.com>
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Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
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--- configure.ac.orig 2012-05-26 22:45:42.753478198 +0000
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+++ configure.ac 2012-05-27 00:36:23.175844081 +0000
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@@ -47,6 +47,28 @@
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dnl Checks for optional library functions
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dnl -------------------------------------
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+dnl First check if we have argp available from libc
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+AC_LINK_IFELSE(
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+ [AC_LANG_PROGRAM(
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+ [#include <argp.h>],
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+ [int argc=1; char *argv[]={"test"}; argp_parse(0,argc,argv,0,0,0); return 0;]
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+ )],
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+ [libc_has_argp="true"],
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+ [libc_has_argp="false"]
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+)
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+
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+dnl If libc doesn't provide argp, then test for libargp
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+if test "$libc_has_argp" = "false" ; then
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+ AC_MSG_WARN("libc does not have argp")
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+ AC_CHECK_LIB([argp], [argp_parse], [have_argp="true"], [have_argp="false"])
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+
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+ if test "$have_argp" = "false"; then
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+ AC_MSG_ERROR("no libargp found")
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+ else
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+ LIBS+=" -largp"
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+ fi
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+fi
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+
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dnl -----------------
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dnl Configure options
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dnl -----------------
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