* shlib-versions [USE_IN_LIBIO] (.*-.*-gnu-gnu*): Set earliest

	supported version for libc 0.2.90.libio to GLIBC_2.2.

	* Makeconfig (soversions.mk): Grok new third column in shlib-versions,
	and use it to emit new variable `map-firstversions'.
	* scripts/firstversions.awk: New file.
	* Makerules (Versions.all): Use scripts/firstversions.awk and
	the $(map-firstversions) value to generate a modified versions list
	that includes renames in "A = B" syntax for each version set earlier
	than the "earliest symbol version" named in shlib-versions.
	* scripts/versions.awk: Recognize "A = B" lines in the input to mean
	rename version set A to B in the output to the intermediate file.
	* scripts/abi-versions.awk: New file.
	* Makerules (abi-versions.h): New target, generated by that script.
	[$(versioning) = yes] (before-compile): Prepend abi-versions.h.
	* include/shlib-compat.h: New file, uses that generated header.

1 files changed, 39 insertions, 0 deletions

diff --git a/scripts/abi-versions.awk b/scripts/abi-versions.awk
new file mode 100644
index 0000000000..0cceaad66a
--- /dev/null
+++ b/scripts/abi-versions.awk
@@ -0,0 +1,39 @@
+# Script to generate <abi-versions.h> header file from Versions.all list.
+# See include/shlib-compat.h comments for explanation.
+
+BEGIN {
+  print "/* This file is automatically generated by abi-versions.awk.";
+  print "   It defines symbols used by shlib-compat.h, which see.  */";
+  print "\n#ifndef _ABI_VERSIONS_H\n#define _ABI_VERSIONS_H";
+}
+
+NF == 2 && $2 == "{" {
+  thislib = $1;
+  gsub(/[^A-Za-z0-9_ 	]/, "_"); libid = $1;
+  printf "\n/* start %s */\n", thislib;
+  next;
+}
+$1 == "}" {
+  printf "/* end %s */\n", thislib;
+  next;
+}
+
+$2 == "=" {
+  new = $3;
+  gsub(/[^A-Za-z0-9_ 	]/, "_"); id = $1;
+  printf "#define ABI_%s_%s\t0\t/* earliest supported %s */\n", libid, id, new;
+  printf "#define VERSION_%s_%s\t%s\n", libid, id, new;
+  next;
+}
+
+{
+  vers = $1;
+  gsub(/[^A-Za-z0-9_ 	]/, "_"); id = $1;
+  printf "#define ABI_%s_%s\t1\t/* support %s */\n", libid, id, vers;
+  printf "#define VERSION_%s_%s\t%s\n", libid, id, vers;
+  next;
+}
+
+END {
+  print "\n#endif /* abi-versions.h */";
+}