diff --git a/cmake/cmake/modules/FindRE2C.cmake b/cmake/cmake/modules/FindRE2C.cmake
index 9717e139..54478c50 100644
--- a/cmake/cmake/modules/FindRE2C.cmake
+++ b/cmake/cmake/modules/FindRE2C.cmake
@@ -156,17 +156,17 @@ if(RE2C_USE_COMPUTED_GOTOS)
 
   cmake_push_check_state(RESET)
     set(CMAKE_REQUIRED_QUIET TRUE)
-    check_source_compiles(C "
-      int main(int argc, const char **argv) {
-        argc = argc;
-        argv = argv;
+    check_source_compiles(C [[
+      int main(void) {
       label1:
+        ;
       label2:
-        static void *adr[] = { &&label1, &&label2};
+        ;
+        static void *adr[] = { &&label1, &&label2 };
         goto *adr[0];
         return 0;
       }
-    " _RE2C_HAVE_COMPUTED_GOTOS)
+    ]] _RE2C_HAVE_COMPUTED_GOTOS)
   cmake_pop_check_state()
 
   if(_RE2C_HAVE_COMPUTED_GOTOS)
diff --git a/cmake/cmake/modules/PHP/CheckFlushIo.cmake b/cmake/cmake/modules/PHP/CheckFlushIo.cmake
index a6cc37d9..27f66e46 100644
--- a/cmake/cmake/modules/PHP/CheckFlushIo.cmake
+++ b/cmake/cmake/modules/PHP/CheckFlushIo.cmake
@@ -35,7 +35,7 @@ if(NOT CMAKE_CROSSCOMPILING)
       #endif
       #include <string.h>
 
-      int main(int argc, char **argv) {
+      int main(void) {
         char *filename = tmpnam(NULL);
         char buffer[64];
         int result = 1;
diff --git a/cmake/cmake/modules/PHP/CheckFopencookie.cmake b/cmake/cmake/modules/PHP/CheckFopencookie.cmake
index 0ef02dee..b6ddb7a4 100644
--- a/cmake/cmake/modules/PHP/CheckFopencookie.cmake
+++ b/cmake/cmake/modules/PHP/CheckFopencookie.cmake
@@ -43,20 +43,21 @@ if(NOT HAVE_FOPENCOOKIE)
 endif()
 
 # GNU C library can have a different seeker definition using off64_t.
-message(
-  CHECK_START
-  "Checking whether fopencookie seeker uses off64_t"
-)
+message(CHECK_START "Checking whether fopencookie seeker uses off64_t")
 
 if(
   CMAKE_CROSSCOMPILING
   AND CMAKE_SYSTEM_NAME STREQUAL "Linux"
   AND PHP_C_STANDARD_LIBRARY STREQUAL "glibc"
 )
+  message(CHECK_PASS "yes (cross-compiling)")
+
   set(
     COOKIE_SEEKER_USES_OFF64_T 1
     CACHE INTERNAL "Whether fopencookie seeker uses off64_t"
   )
+
+  return()
 else()
   cmake_push_check_state(RESET)
     set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
@@ -107,9 +108,7 @@ else()
   cmake_pop_check_state()
 endif()
 
-if(CMAKE_CROSSCOMPILING AND COOKIE_SEEKER_USES_OFF64_T)
-  message(CHECK_PASS "yes (cross-compiling)")
-elseif(COOKIE_SEEKER_USES_OFF64_T)
+if(COOKIE_SEEKER_USES_OFF64_T)
   message(CHECK_PASS "yes")
 else()
   message(CHECK_FAIL "no")
diff --git a/cmake/cmake/modules/PHP/StandardLibrary.cmake b/cmake/cmake/modules/PHP/StandardLibrary.cmake
index 480975f9..61388b28 100644
--- a/cmake/cmake/modules/PHP/StandardLibrary.cmake
+++ b/cmake/cmake/modules/PHP/StandardLibrary.cmake
@@ -1,5 +1,5 @@
 #[=============================================================================[
-Determine C standard library that will be used for the build.
+Determine the C standard library used for the build.
 
 Result variables:
   PHP_C_STANDARD_LIBRARY
@@ -19,9 +19,9 @@ include(CMakePushCheckState)
 
 message(CHECK_START "Checking C standard library")
 
-# Initial uClibc and its maintained fork uClibc-ng behave like minimalistic GNU
-# C but aren't. These can be determined by the __UCLIBC__ symbol. They must be
-# checked first because they also define the __GLIBC__ symbol.
+# The uClibc and its maintained fork uClibc-ng behave like minimalistic GNU C
+# library but have differences. They can be determined by the __UCLIBC__ symbol
+# and must be checked first because they also define the __GLIBC__ symbol.
 cmake_push_check_state(RESET)
   set(CMAKE_REQUIRED_QUIET TRUE)
   check_symbol_exists(__UCLIBC__ features.h _PHP_C_STANDARD_LIBRARY_UCLIBC)
@@ -32,8 +32,8 @@ if(_PHP_C_STANDARD_LIBRARY_UCLIBC)
   return()
 endif()
 
-# GNU C standard library has __GLIBC__ and __GLIBC_MINOR__ symbols synce the
-# very early versions 2.0.
+# The GNU C standard library has __GLIBC__ and __GLIBC_MINOR__ symbols since the
+# very early version 2.0.
 cmake_push_check_state(RESET)
   set(CMAKE_REQUIRED_QUIET TRUE)
   check_symbol_exists(__GLIBC__ features.h _PHP_C_STANDARD_LIBRARY_GLIBC)
@@ -44,33 +44,33 @@ if(_PHP_C_STANDARD_LIBRARY_GLIBC)
   return()
 endif()
 
-# The musl libc doesn't advertise itself specifically via symbols, so it must
-# be guessed.
+# The musl libc doesn't advertise itself with symbols, so it must be determined
+# heuristically.
 cmake_push_check_state(RESET)
   set(CMAKE_REQUIRED_QUIET TRUE)
   check_symbol_exists(__DEFINED_va_list stdarg.h _PHP_C_STANDARD_LIBRARY_MUSL)
 cmake_pop_check_state()
 if(_PHP_C_STANDARD_LIBRARY_MUSL)
   set(PHP_C_STANDARD_LIBRARY "musl")
+else()
+  # Otherwise, try determining musl libc with ldd.
+  block(PROPAGATE PHP_C_STANDARD_LIBRARY)
+    execute_process(
+      COMMAND ldd --version
+      OUTPUT_VARIABLE version
+      ERROR_QUIET
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+
+    if(version MATCHES ".*musl libc.*")
+      set(PHP_C_STANDARD_LIBRARY "musl")
+    endif()
+  endblock()
+endif()
+if(PHP_C_STANDARD_LIBRARY STREQUAL "musl")
+  set(__MUSL__ 1 CACHE INTERNAL "Whether musl libc is used.")
   message(CHECK_PASS "musl")
   return()
 endif()
 
-# Otherwise, try using ldd.
-block(PROPAGATE PHP_C_STANDARD_LIBRARY)
-  execute_process(
-    COMMAND ldd --version
-    OUTPUT_VARIABLE version
-    ERROR_QUIET
-    OUTPUT_STRIP_TRAILING_WHITESPACE
-  )
-
-  if(version MATCHES ".*musl libc.*")
-    set(__MUSL__ 1 CACHE INTERNAL "Whether musl libc is used")
-    set(PHP_C_STANDARD_LIBRARY "musl")
-    message(CHECK_PASS "musl")
-    return()
-  endif()
-endblock()
-
 message(CHECK_FAIL "unknown")
diff --git a/cmake/ext/curl/CMakeLists.txt b/cmake/ext/curl/CMakeLists.txt
index daff4556..68df70a1 100644
--- a/cmake/ext/curl/CMakeLists.txt
+++ b/cmake/ext/curl/CMakeLists.txt
@@ -70,33 +70,40 @@ if(PHP_THREAD_SAFETY AND CURL_SSL_FOUND)
         #include <strings.h>
         #include <curl/curl.h>
 
-        int main(int argc, char *argv[]) {
+        int main(void) {
           curl_version_info_data *data = curl_version_info(CURLVERSION_NOW);
 
           if (data && data->ssl_version && *data->ssl_version) {
             const char *ptr = data->ssl_version;
 
-            while(*ptr == ' ') ++ptr;
+            while(*ptr == ' ') {
+              ++ptr;
+            }
+
             int major, minor;
-            if (sscanf(ptr, "OpenSSL/%d", &major) == 1) {
-              if (major >= 3) {
-                /* OpenSSL version 3 or later */
-                return 4;
-              }
+
+            /* OpenSSL >= 3 */
+            if (sscanf(ptr, "OpenSSL/%d", &major) == 1 && major >= 3) {
+              return 4;
             }
-            if (sscanf(ptr, "OpenSSL/%d.%d", &major, &minor) == 2) {
-              if (major > 1 || (major == 1 && minor >= 1)) {
-                /* OpenSSL version 1.1 or later */
-                return 3;
-              }
+
+            /* OpenSSL >= 1.1 */
+            if (
+              sscanf(ptr, "OpenSSL/%d.%d", &major, &minor) == 2 &&
+              (major > 1 || (major == 1 && minor >= 1))
+            ) {
+              return 3;
             }
+
+            /* OpenSSL < 1.1 */
             if (strncasecmp(ptr, "OpenSSL", sizeof("OpenSSL")-1) == 0) {
-              /* Old OpenSSL version */
               return 0;
             }
+
             /* Different SSL library */
             return 2;
           }
+
           /* No SSL support */
           return 1;
         }
@@ -118,13 +125,23 @@ if(PHP_THREAD_SAFETY AND CURL_SSL_FOUND)
 
     target_link_libraries(php_curl PRIVATE OpenSSL::Crypto)
 
-    check_include_file(openssl/crypto.h HAVE_OPENSSL_CRYPTO_H)
+    if(TARGET OpenSSL::Crypto)
+      cmake_push_check_state(RESET)
+        set(CMAKE_REQUIRED_LIBRARIES OpenSSL::Crypto)
+        check_include_file(openssl/crypto.h HAVE_OPENSSL_CRYPTO_H)
+      cmake_pop_check_state()
+    endif()
   endif()
 endif()
 
 # Sanity check.
 if(TARGET CURL::libcurl)
-  check_library_exists(CURL::libcurl curl_easy_perform "" HAVE_CURL_EASY_PERFORM)
+  check_library_exists(
+    CURL::libcurl
+    curl_easy_perform
+    ""
+    HAVE_CURL_EASY_PERFORM
+  )
 
   if(NOT HAVE_CURL_EASY_PERFORM)
     message(
diff --git a/cmake/ext/gd/CMakeLists.txt b/cmake/ext/gd/CMakeLists.txt
index 62523a38..5868093d 100644
--- a/cmake/ext/gd/CMakeLists.txt
+++ b/cmake/ext/gd/CMakeLists.txt
@@ -385,7 +385,10 @@ if(NOT EXT_GD_EXTERNAL)
       cmake_pop_check_state()
 
       if(NOT _GD_SANITY_CHECK_COMPILES)
-        message(FATAL_ERROR "GD build test failed. Please check logs for details.")
+        message(
+          FATAL_ERROR
+          "GD build test failed. Please check logs for details."
+        )
       endif()
     endif()
   endblock()
@@ -443,8 +446,8 @@ else()
             void exit1(int priority, const char *format, va_list args) {
               _exit(1);
             }
-            /* Override the default gd_error_method with one that actually causes
-              the program to return an error. */
+            /* Override the default gd_error_method with one that actually
+              causes the program to return an error. */
             int main(int argc, char** argv) {
               ${declaration};
               gdSetErrorMethod(exit1);
@@ -465,6 +468,11 @@ else()
 
     check_library_exists(GD::GD gdFontCacheShutdown "" HAVE_GD_FREETYPE)
     check_library_exists(GD::GD gdVersionString "" HAVE_GD_LIBVERSION)
-    check_library_exists(GD::GD gdImageGetInterpolationMethod "" HAVE_GD_GET_INTERPOLATION)
+    check_library_exists(
+      GD::GD
+      gdImageGetInterpolationMethod
+      ""
+      HAVE_GD_GET_INTERPOLATION
+    )
   endif()
 endif()