merge revision(s) 18eaf0be905e3e251423b42d6f4e56b7cae1bc3b: [Backport #20494]

	[Bug #20494] Search non-default directories for GMP

	Co-Authored-by: lish82 (Hiroki Katagiri)

3 files changed, 11 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index 5ca1ffbedb..7976c12869 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,6 +16,7 @@ m4_include([tool/m4/ruby_append_option.m4])dnl
 m4_include([tool/m4/ruby_append_options.m4])dnl
 m4_include([tool/m4/ruby_check_builtin_func.m4])dnl
 m4_include([tool/m4/ruby_check_builtin_setjmp.m4])dnl
+m4_include([tool/m4/ruby_check_header.m4])dnl
 m4_include([tool/m4/ruby_check_printf_prefix.m4])dnl
 m4_include([tool/m4/ruby_check_setjmp.m4])dnl
 m4_include([tool/m4/ruby_check_signedness.m4])dnl
@@ -1353,7 +1354,7 @@ AS_CASE("$target_cpu", [x64|x86_64|i[3-6]86*], [
 RUBY_UNIVERSAL_CHECK_HEADER([x86_64, i386], x86intrin.h)
 
 AS_IF([test "x$with_gmp" != xno],
-  [AC_CHECK_HEADERS(gmp.h)
+  [RUBY_CHECK_HEADER(gmp.h)
    AS_IF([test "x$ac_cv_header_gmp_h" != xno],
      AC_SEARCH_LIBS([__gmpz_init], [gmp],
        [AC_DEFINE(HAVE_LIBGMP, 1)]))])
diff --git a/tool/m4/ruby_check_header.m4 b/tool/m4/ruby_check_header.m4
new file mode 100644
index 0000000000..171455549e
--- /dev/null
+++ b/tool/m4/ruby_check_header.m4
@@ -0,0 +1,8 @@
+dnl -*- Autoconf -*-
+AC_DEFUN([RUBY_CHECK_HEADER],
+    [# RUBY_CHECK_HEADER($@)
+    save_CPPFLAGS="$CPPFLAGS"
+    CPPFLAGS="$CPPFLAGS m4_if([$5], [], [$INCFLAGS], [$5])"
+    AC_CHECK_HEADER([$1], [$2], [$3], [$4])
+    CPPFLAGS="$save_CPPFLAGS"
+    unset save_CPPFLAGS])
diff --git a/version.h b/version.h
index a0f980027f..fb7fa3124c 100644
--- a/version.h
+++ b/version.h
@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 4
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 176
+#define RUBY_PATCHLEVEL 177
 
 #include "ruby/version.h"
 #include "ruby/internal/abi.h"