[PATCH v2 1/5] erofs-utils: introduce --with-lz4-include and --with-lz4-lib

[Gao Xiang]

Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>
---
v1 -> v2:
 - clean up configure.ac further.
 - refine commit messages.

 Makefile.am  |  1 -
 configure.ac | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 61 insertions(+), 11 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index b3dc472..cef847d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -26,7 +26,6 @@ noinst_HEADERS = erofs_config.h  \
 
 mkfs_erofs_CFLAGS = -Wall -Werror -DEROFS_MKFS_VERSION=\"v1.0\"
 mkfs_erofs_LDFLAGS  = --static
-mkfs_erofs_LDADD   = $(LIBLZ4_STATIC)
 ACLOCAL_AMFLAGS = -I m4
 
 if SUPPORT_LARG_FILE_AT_BIT32
diff --git a/configure.ac b/configure.ac
index 15974f8..4529576 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,27 +12,70 @@ AC_PROG_CC
 AC_PROG_INSTALL
 AC_PROG_LIBTOOL
 
+dnl EROFS_UTILS_PARSE_DIRECTORY
+dnl Input:  $1 = a string to a relative or absolute directory
+dnl Output: $2 = the variable to set with the absolute directory
+AC_DEFUN([EROFS_UTILS_PARSE_DIRECTORY],
+[
+ dnl Check if argument is a directory
+ if test -d $1 ; then
+    dnl Get the absolute path of the directory
+    dnl in case of relative directory.
+    dnl If realpath is not a valid command,
+    dnl an error is produced and we keep the given path.
+    local_tmp=`realpath $1 2>/dev/null`
+    if test "$local_tmp" != "" ; then
+       if test -d "$local_tmp" ; then
+           $2="$local_tmp"
+       else
+           $2=$1
+       fi
+    else
+       $2=$1
+    fi
+    dnl Check for space in the directory
+    if test `echo $1|cut -d' ' -f1` != $1 ; then
+        AC_MSG_ERROR($1 directory shall not contain any space.)
+    fi
+ else
+    AC_MSG_ERROR($1 shall be a valid directory)
+ fi
+])
 
 # checks system architecture firtly for enable support larg file
 ARCH_BIT=`getconf LONG_BIT`
 AM_CONDITIONAL([SUPPORT_LARG_FILE_AT_BIT32],[test x$ARCH_BIT = x32])
 
 # Checks for libraries.
-# Ask user for path to liblz4.a stuff:.
-AC_ARG_WITH(lz4,
-    [ --with-lz4=<path> prefix of liblz4.a installation. e.g. /usr/local or /usr],
-    [LIBLZ4_STATIC=$with_lz4/liblz4.a],
-    AC_MSG_ERROR([You must call configure with the --with-lz4 option.
-    This tells configure where to find the MySql C library and headers.
-    e.g. --with-lz4=/usr/local or --with-lz4=/usr])
-)
+# Ask user for LZ4 library path if needed.
+
+AC_ARG_WITH(lz4_include,
+   [  --with-lz4-include=DIR  LZ4 include directory ],
+   EROFS_UTILS_PARSE_DIRECTORY(["$withval"],[withval])
+   CPPFLAGS="$CPPFLAGS -I$withval")
+
+AC_ARG_WITH(lz4_lib,
+   [  --with-lz4-lib=DIR      LZ4 lib directory ], [
+   EROFS_UTILS_PARSE_DIRECTORY(["$withval"],[withval])
+   LDFLAGS="$LDFLAGS -L$withval"
+   lz4_lib_path="$withval"
+  ])
 
-AC_SUBST(LIBLZ4_STATIC)
+AC_ARG_WITH(lz4,
+   [  --with-lz4=DIR          LZ4 install directory, e.g. /usr/local or /usr ], [
+   EROFS_UTILS_PARSE_DIRECTORY(["$withval"],[withval])
+   if test -z "$with_gmp_lib" && test -z "$with_gmp_include" ; then
+      CPPFLAGS="$CPPFLAGS -I$withval/include"
+      LDFLAGS="$LDFLAGS -L$withval/lib"
+      lz4_lib_path="$withval/lib"
+   else
+      AC_MSG_FAILURE([Do not use --with-lz4 and --with-lz4-include/--with-lz4-lib options simultaneously.])
+   fi
+  ])
 
 # Checks for header files.
 AC_CHECK_HEADERS([fcntl.h inttypes.h limits.h stddef.h stdint.h stdlib.h string.h sys/time.h unistd.h])
 
-
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_INLINE
 AC_TYPE_INT64_T
@@ -45,5 +88,13 @@ AC_TYPE_UINT64_T
 AC_FUNC_MALLOC
 AC_CHECK_FUNCS([ftruncate getcwd gettimeofday memset realpath strdup strerror strrchr strtoull])
 
+# Configure lz4.
+have_lz4="1"
+AC_CHECK_HEADERS([lz4.h], , [have_lz4="0"])
+AC_CHECK_LIB(lz4, LZ4_versionNumber, [LIBS="-Wl,-Bstatic,-llz4,-Bdynamic $LIBS"] , [have_lz4="0"])
+if test "x${have_lz4}" = "x0" ; then
+  AC_MSG_ERROR([Cannot build without lz4])
+fi
+
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
-- 
2.14.4