From 222d8c7d41f75d186195d01e9282d757cea05e2e Mon Sep 17 00:00:00 2001
From: kaoru <kaorut@mc.pikara.ne.jp>
Date: Sat, 2 May 2026 16:09:05 +0900
Subject: [PATCH 1/3] chore: improved pthread flag handling to prevent
 redundant linking flags #349

Improved pthread flag handling to prevent redundant linking flags.

- Reset AX_PTHREAD_LINK_CFLAGS to empty initially
- Set AX_PTHREAD_LINK_CFLAGS only when PTHREAD_CFLAGS is exactly "-pthread" or "-pthreads"
- Conditionally prepend AX_PTHREAD_LINK_CFLAGS to LDFLAGS only when non-empty
- Ensures no duplicate pthread flags regardless of compiler (Clang/GCC)
---
 configure.ac | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 3aec7b18..cdd9954b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -184,10 +184,14 @@ test -z $DOXYGEN && \
 
 #### Library Checks ####
 AX_PTHREAD
-AX_PTHREAD_LINK_CFLAGS="${PTHREAD_CFLAGS}"
+AX_PTHREAD_LINK_CFLAGS=""
 AS_IF(
-    [${CXX} --version 2>/dev/null | grep -qi clang],
-    [test "x${PTHREAD_CFLAGS}" = "x-pthread" && AX_PTHREAD_LINK_CFLAGS=""]
+    [test "x${PTHREAD_CFLAGS}" = "x-pthread" || test "x${PTHREAD_CFLAGS}" = "x-pthreads"],
+    [AX_PTHREAD_LINK_CFLAGS="${PTHREAD_CFLAGS}"]
+)
+AS_IF(
+    [test -n "${AX_PTHREAD_LINK_CFLAGS}"],
+    [LDFLAGS="${AX_PTHREAD_LINK_CFLAGS} ${LDFLAGS}"]
 )
 LDFLAGS="${AX_PTHREAD_LINK_CFLAGS} ${LDFLAGS}"
 AC_SUBST([LIBS], "${PTHREAD_LIBS} ${LIBS}")

From d636e06c9f853660147128c29322196035dfcb47 Mon Sep 17 00:00:00 2001
From: kaoru <kaorut@mc.pikara.ne.jp>
Date: Sat, 2 May 2026 16:29:10 +0900
Subject: [PATCH 2/3] fix: use AS_CASE for pthread flags detection #349

Modernize pthread handling to match Boost 1.91.0 requirement.

Replaced AS_IF with AS_CASE to properly detect and set AX_PTHREAD_LINK_CFLAGS
only when PTHREAD_CFLAGS is exactly "-pthread" or "-pthreads", avoiding
incorrect handling of other values. This ensures consistent linking behavior
across modern compilers.
---
 configure.ac | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index cdd9954b..f947f330 100644
--- a/configure.ac
+++ b/configure.ac
@@ -185,9 +185,10 @@ test -z $DOXYGEN && \
 #### Library Checks ####
 AX_PTHREAD
 AX_PTHREAD_LINK_CFLAGS=""
-AS_IF(
-    [test "x${PTHREAD_CFLAGS}" = "x-pthread" || test "x${PTHREAD_CFLAGS}" = "x-pthreads"],
-    [AX_PTHREAD_LINK_CFLAGS="${PTHREAD_CFLAGS}"]
+AS_CASE(
+    [" ${PTHREAD_CFLAGS} "],
+    [*" -pthread "*], [AX_PTHREAD_LINK_CFLAGS="-pthread"],
+    [*" -pthreads "*], [AX_PTHREAD_LINK_CFLAGS="-pthreads"]
 )
 AS_IF(
     [test -n "${AX_PTHREAD_LINK_CFLAGS}"],

From f656e99246f6b39a603e82ae873f74987dc4d27e Mon Sep 17 00:00:00 2001
From: kaoru <kaorut@mc.pikara.ne.jp>
Date: Sat, 2 May 2026 22:42:11 +0900
Subject: [PATCH 3/3] build: update kogyan submodule to latest commit #349

Modernizes the kogyan dependency as part of #349.
---
 kogyan | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kogyan b/kogyan
index 29f0fe8c..4217a272 160000
--- a/kogyan
+++ b/kogyan
@@ -1 +1 @@
-Subproject commit 29f0fe8c1f6ffc50a312d664983304e39cb4bef0
+Subproject commit 4217a272a2e25d6b7e8b49643a9177a9157aca72