identification: Add support for POSIX regular expressions

When cross-compiling for Windows on Ubuntu, we don't have POSIX regular expressions available (there does not seem to be any alternative libraries either), but since the tests are not executed that's OK. On AppVeyor, MSYS2 has libgnurx installed, which works fine but requires explicit linking with `-lregex`. This is loosely based on a patch by Thomas Egerer.
2025-05-28 09:58:17 +02:00
parent 2b1f0e8c6e
commit 7de05b918c
4 changed files with 492 additions and 55 deletions
@@ -604,6 +604,10 @@ AC_LINK_IFELSE(
 AC_SUBST(ATOMICLIB)

 LIBS=$saved_LIBS
+
+# Some platforms require explicit linking to use POSIX regular expressions
+AC_SEARCH_LIBS([regcomp], [regex], [AC_DEFINE([HAVE_REGEX], [], [have regcomp() etc.])])
+
 # ------------------------------------------------------

 AC_MSG_CHECKING(for dladdr)