tests: posix: common: separate posix c_lib_ext to standalone test

[Pancakem]

Fixes #81488
posix.common contains testsuites that can be separated into smaller groups of tests. This change moves fnmatch into a singular testsuite at tests/posix/c_lib_ext app directory.

[cfriedt]

Please also move the getentropy and getopt tests to the new directory in this PR as well.

Note: getentropy() was added as part of the 2024 revision but was not part of the 2008 revision.

https://pubs.opengroup.org/onlinepubs/9799919799/xrat/V4_subprofiles.html

[cfriedt]

@Pancakem - this would do it for me. For the POSIX_C_LIB_EXT option group, there should be no requirement to even set CONFIG_POSIX_API. Since CONFIG_POSIX_API will probably go the way of the dinosaur, this should be fine.

diff --git a/tests/posix/c_lib_ext/CMakeLists.txt b/tests/posix/c_lib_ext/CMakeLists.txt
index e607b5283b5..24c7cfd2194 100644
--- a/tests/posix/c_lib_ext/CMakeLists.txt
+++ b/tests/posix/c_lib_ext/CMakeLists.txt
@@ -8,4 +8,5 @@ FILE(GLOB app_sources src/*.c)
 
 target_sources(app PRIVATE ${app_sources})
 
+target_include_directories(app PRIVATE ${ZEPHYR_BASE}/lib/posix/options/getopt)
 target_compile_options(app PRIVATE -U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L)
diff --git a/tests/posix/c_lib_ext/prj.conf b/tests/posix/c_lib_ext/prj.conf
index 55affe2f7f8..7e8b0675c52 100644
--- a/tests/posix/c_lib_ext/prj.conf
+++ b/tests/posix/c_lib_ext/prj.conf
@@ -1,4 +1,3 @@
-CONFIG_POSIX_API=y
 CONFIG_ZTEST=y
 
 CONFIG_POSIX_C_LIB_EXT=y
diff --git a/tests/posix/c_lib_ext/src/fnmatch.c b/tests/posix/c_lib_ext/src/fnmatch.c
index 0faf8492829..66b6aadf86d 100644
--- a/tests/posix/c_lib_ext/src/fnmatch.c
+++ b/tests/posix/c_lib_ext/src/fnmatch.c
@@ -4,8 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <fnmatch.h>
-
+#include <zephyr/posix/fnmatch.h>
 #include <zephyr/ztest.h>
 
 /*
diff --git a/tests/posix/c_lib_ext/src/getentropy.c b/tests/posix/c_lib_ext/src/getentropy.c
index b41527a9c50..f04e54becb0 100644
--- a/tests/posix/c_lib_ext/src/getentropy.c
+++ b/tests/posix/c_lib_ext/src/getentropy.c
@@ -4,9 +4,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr/ztest.h>
-
 #include <zephyr/posix/unistd.h>
+#include <zephyr/ztest.h>
 
 ZTEST(posix_c_lib_ext, test_getentropy_too_large)
 {
diff --git a/tests/posix/c_lib_ext/src/getopt.c b/tests/posix/c_lib_ext/src/getopt.c
index 826d8d9be8a..febe55c3468 100644
--- a/tests/posix/c_lib_ext/src/getopt.c
+++ b/tests/posix/c_lib_ext/src/getopt.c
@@ -9,11 +9,12 @@
  *
  */
 
-#include <zephyr/kernel.h>
-#include <zephyr/ztest.h>
+#include <getopt.h>
 #include <string.h>
+
+#include <zephyr/kernel.h>
 #include <zephyr/posix/unistd.h>
-#include <getopt.h>
+#include <zephyr/ztest.h>
 
 ZTEST(posix_c_lib_ext, test_getopt_basic)
 {

[cfriedt]

I think there is likely an unrelated test failing in main, so this will just need a rebase at some point

[cfriedt]

@Pancakem - this should basically be ready to go after a rebase