[PATCH] autoconf: Add link tests to each AC_CHECK_FUNC() test

From: David M. Syzdek <david.syzdek@acsalaska.net>
Date: Oct 26, 2008, 11:52 UTC
Message-ID: <1225021939-11858-1-git-send-email-david.syzdek@acsalaska.net>

Update configure.ac to test libraries for getaddrinfo, strcasestr, memmem, strlcpy, strtoumax, setenv, unsetenv, and mkdtemp. The default compilers on FreeBSD 4.9-SECURITY and FreeBSD 6.2-RELEASE-p4 do not generate warnings for missing prototypes unless `-Wall' is used. This behavior renders the results of AC_CHECK_FUNC() void on these platforms. The test AC_SEARCH_LIBS() verifies a function is valid by linking to symbol within the system libraries.

Signed-off-by: David M. Syzdek <david.syzdek@acsalaska.net>
---
 configure.ac |   57 ++++++++++++++++++++++++++++++++++++++++-----------------
 1 files changed, 40 insertions(+), 17 deletions(-)

diff --git a/configure.ac b/configure.ac
index 7c2856e..d3b8bc3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -293,9 +293,11 @@ AC_SUBST(NO_SOCKADDR_STORAGE)
 #
 # Define NO_IPV6 if you lack IPv6 support and getaddrinfo().
 AC_CHECK_TYPE([struct addrinfo],[
- AC_CHECK_FUNC([getaddrinfo],
-  [NO_IPV6=],
-  [NO_IPV6=YesPlease])
+ AC_CHECK_FUNC([getaddrinfo],[
+  AC_SEARCH_LIBS([getaddrinfo],,
+    [NO_IPV6=],
+    [NO_IPV6=YesPlease])
+ ],[NO_IPV6=YesPlease])
 ],[NO_IPV6=YesPlease],[
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -387,44 +389,65 @@ AC_SUBST(SNPRINTF_RETURNS_BOGUS)
 AC_MSG_NOTICE([CHECKS for library functions])
 #
 # Define NO_STRCASESTR if you don't have strcasestr.
-AC_CHECK_FUNC(strcasestr,
-[NO_STRCASESTR=],
+AC_CHECK_FUNC(strcasestr,[
+ AC_SEARCH_LIBS(strcasestr,,
+ [NO_STRCASESTR=],
+ [NO_STRCASESTR=YesPlease])
+],
 [NO_STRCASESTR=YesPlease])
 AC_SUBST(NO_STRCASESTR)
 #
 # Define NO_MEMMEM if you don't have memmem.
-AC_CHECK_FUNC(memmem,
-[NO_MEMMEM=],
+AC_CHECK_FUNC(memmem,[
+ AC_SEARCH_LIBS(memmem,,
+ [NO_MEMMEM=],
+ [NO_MEMMEM=YesPlease])
+],
 [NO_MEMMEM=YesPlease])
 AC_SUBST(NO_MEMMEM)
 #
 # Define NO_STRLCPY if you don't have strlcpy.
-AC_CHECK_FUNC(strlcpy,
-[NO_STRLCPY=],
+AC_CHECK_FUNC(strlcpy,[
+ AC_SEARCH_LIBS(strlcpy,,
+ [NO_STRLCPY=],
+ [NO_STRLCPY=YesPlease])
+],
 [NO_STRLCPY=YesPlease])
 AC_SUBST(NO_STRLCPY)
 #
 # Define NO_STRTOUMAX if you don't have strtoumax in the C library.
-AC_CHECK_FUNC(strtoumax,
-[NO_STRTOUMAX=],
+AC_CHECK_FUNC(strtoumax,[
+ AC_SEARCH_LIBS(strtoumax,,
+ [NO_STRTOUMAX=],
+ [NO_STRTOUMAX=YesPlease])
+],
 [NO_STRTOUMAX=YesPlease])
 AC_SUBST(NO_STRTOUMAX)
 #
 # Define NO_SETENV if you don't have setenv in the C library.
-AC_CHECK_FUNC(setenv,
-[NO_SETENV=],
+AC_CHECK_FUNC(setenv,[
+ AC_SEARCH_LIBS(setenv,,
+ [NO_SETENV=],
+ [NO_SETENV=YesPlease])
+],
 [NO_SETENV=YesPlease])
 AC_SUBST(NO_SETENV)
 #
 # Define NO_UNSETENV if you don't have unsetenv in the C library.
-AC_CHECK_FUNC(unsetenv,
-[NO_UNSETENV=],
+AC_CHECK_FUNC(unsetenv,[
+ AC_SEARCH_LIBS(unsetenv,,
+ [NO_UNSETENV=],
+ [NO_UNSETENV=YesPlease])
+],
 [NO_UNSETENV=YesPlease])
 AC_SUBST(NO_UNSETENV)
 #
 # Define NO_MKDTEMP if you don't have mkdtemp in the C library.
-AC_CHECK_FUNC(mkdtemp,
-[NO_MKDTEMP=],
+AC_CHECK_FUNC(mkdtemp,[
+ AC_SEARCH_LIBS(mkdtemp,,
+ [NO_MKDTEMP=],
+ [NO_MKDTEMP=YesPlease])
+],
 [NO_MKDTEMP=YesPlease])
 AC_SUBST(NO_MKDTEMP)
 #

-- 
1.6.0.2.GIT