From 1559f7f4581832f05339b950fc7c82a8c98a9e0f Mon Sep 17 00:00:00 2001
From: Takashi Yano <takashi.yano@nifty.ne.jp>
Date: Thu, 19 May 2022 02:51:46 +0900
Subject: [PATCH] Cygwin: Use two pass parse for tlsoffsets generation.

- The commit "Cygwin: fix new sigfe.o generation in optimized case"
  fixed the wrong tlsoffsets generation by adding -O0 to compile
  options. Current gentls_offsets expects entry of "start_offset"
  is the first entry in the assembler code. However, without -O0,
  entry of "start_offset" goes to the last entry for some reason.
  Currently, -O0 can prevents assembler code from reversing the
  order of the entries, however, there is no guarantee that it will
  retain the order of the entries in the future.

  This patch makes gentls_offsets parse the assembler code in the
  two pass to omit -O0 option dependency.
---
 winsup/cygwin/gentls_offsets | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/winsup/cygwin/gentls_offsets b/winsup/cygwin/gentls_offsets
index d76562c05..0adb702a3 100755
--- a/winsup/cygwin/gentls_offsets
+++ b/winsup/cygwin/gentls_offsets
@@ -2,6 +2,9 @@
 #set -x
 input_file=$1
 output_file=$2
+tmp_file=/tmp/${output_file}.$$
+
+trap "rm -f ${tmp_file}" 0 1 2 15
 
 # Preprocess cygtls.h and filter out only the member lines from
 # class _cygtls to generate an input file for the cross compiler
@@ -43,7 +46,7 @@ gawk '
   }
 ' | \
 # Now run the compiler to generate an assembler file.
-${CXXCOMPILE} -x c++ -g0 -O0 -S - -o - | \
+${CXXCOMPILE} -x c++ -g0 -S - -o ${tmp_file} && \
 # The assembler file consists of lines like these:
 #
 #   __CYGTLS__foo
@@ -52,10 +55,25 @@ ${CXXCOMPILE} -x c++ -g0 -O0 -S - -o - | \
 #       .align 4
 #
 # From this info, generate the tlsoffsets file.
-gawk '\
+start_offset=$(gawk '\
+  BEGIN {
+    varname=""
+  }
+  /^__CYGTLS__/ {
+    varname = gensub (/__CYGTLS__(\w+):/, "\\1", "g");
+  }
+  /\s*\.long\s+/ {
+    if (length (varname) > 0) {
+      if (varname == "start_offset") {
+	print $2;
+      }
+      varname = "";
+    }
+  }
+' ${tmp_file}) && \
+gawk -v start_offset="$start_offset" '\
   BEGIN {
     varname=""
-    start_offset = 0
   }
   /^__CYGTLS__/ {
     varname = gensub (/__CYGTLS__(\w+):/, "\\1", "g");
@@ -70,7 +88,6 @@ gawk '\
   /\s*\.long\s+/ {
     if (length (varname) > 0) {
       if (varname == "start_offset") {
-      	start_offset = $2;
 	printf (".equ _cygtls.%s, -%u\n", varname, start_offset);
       } else {
       	value = $2;
@@ -80,4 +97,4 @@ gawk '\
       varname = "";
     }
   }
-' > "${output_file}"
+' ${tmp_file} > "${output_file}"
-- 
2.43.5