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authorYang Tse <yangsita@gmail.com>2013-07-18 16:03:15 +0200
committerYang Tse <yangsita@gmail.com>2013-07-18 16:03:15 +0200
commitdd17069c9e307ff135f4eb572671bd351f7e6a42 (patch)
tree464793c0903a8b5b3a45dfcaaeb4d0fd54ba3655
parent26b0cb6ae298f3e0a67b6db4f015ca21eda7d19d (diff)
xc-am-iface.m4: comments refinement
-rw-r--r--m4/xc-am-iface.m425
1 files changed, 19 insertions, 6 deletions
diff --git a/m4/xc-am-iface.m4 b/m4/xc-am-iface.m4
index 1532ff834..1571c211f 100644
--- a/m4/xc-am-iface.m4
+++ b/m4/xc-am-iface.m4
@@ -31,6 +31,10 @@ dnl newer is used at configure script generation time, this
dnl results in 'subdir-objects' automake option being used.
dnl When using automake versions older than 1.14 this option
dnl is not used when generating configure script.
+dnl
+dnl Existence of automake _AM_PROG_CC_C_O m4 private macro
+dnl is used to differentiate automake version 1.14 from older
+dnl ones which lack this macro.
m4_define([_XC_AUTOMAKE_BODY],
[dnl
@@ -56,8 +60,13 @@ dnl -------------------------------------------------
dnl Public macro.
dnl
dnl This macro embeds automake machinery into configure
-dnl script with initialization option 'subdir-objects'
-dnl when using automake version 1.14 or newer.
+dnl script regardless of automake version used in order
+dnl to generate configure script.
+dnl
+dnl When using automake version 1.14 or newer, automake
+dnl initialization option 'subdir-objects' is used to
+dnl generate the configure script, otherwise this option
+dnl is not used.
AC_DEFUN([XC_AUTOMAKE],
[dnl
@@ -82,6 +91,8 @@ dnl This macro performs shell code embedding into
dnl configure script in order to modify distclean
dnl and maintainer-clean targets of makefiles which
dnl are located in given list of subdirs.
+dnl
+dnl See XC_AMEND_DISTCLEAN comments for details.
m4_define([_XC_AMEND_DISTCLEAN_BODY],
[dnl
@@ -124,7 +135,7 @@ xc_dep_subdirs=`echo "$xc_inc_lines" \
echo "$xc_rm_depfiles" >$xc_p
for xc_dep_dir in $xc_dep_subdirs; do
- echo "${xc_tab}@xm_dep_cnt=\`ls $xc_dep_dir | wc -l 2>/dev/null\`; \\" >>$xc_p
+ echo "${xc_tab}@xm_dep_cnt=\`ls $xc_dep_dir | wc -l 2>/dev/null\`; \\" >>$xc_p
echo "${xc_tab}if test \$\$xm_dep_cnt -eq 0 && test -d $xc_dep_dir; then \\" >>$xc_p
echo "${xc_tab} rm -rf $xc_dep_dir; \\" >>$xc_p
echo "${xc_tab}fi" >>$xc_p
@@ -196,8 +207,9 @@ dnl Public macro.
dnl
dnl This macro embeds shell code into configure script
dnl that amends, at configure runtime, the distclean
-dnl target of Makefiles located in all subdirs given in
-dnl the mandatory white-space separated list argument.
+dnl and maintainer-clean targets of Makefiles located
+dnl in all subdirs given in the mandatory white-space
+dnl separated list argument.
dnl
dnl Embedding only takes place when using automake 1.14
dnl or newer, otherwise amending code is not included
@@ -207,7 +219,8 @@ dnl distclean and maintainer-clean targets are modified
dnl to avoid unconditional removal of dependency subdirs
dnl which triggers distclean and maintainer-clean errors
dnl when using automake 'subdir-objects' option along
-dnl with per-target objects.
+dnl with per-target objects and source files existing in
+dnl multiple subdirs used for different build targets.
dnl
dnl New behavior first removes each dependency tracking
dnl file independently, and only removes each dependency