Fix building with GCC 15 (#9643)

* Patch GMP to build on GCC15

* Add cstdint include - GCC15 defaults to C23

* Update GMP PATCH_COMMAND to work without a valid git repo

* Set GMP_DIRECTORY_FLAG

deps/GMP/0001-GMP_GCC15.patch

@@ -0,0 +1,32 @@
+--- GMP/acinclude.m4	2025-05-14 18:50:11.396354745 -0400
++++ GMP/acinclude.m4.2	2025-05-14 18:57:20.757853503 -0400
+@@ -609,7 +609,7 @@
+
+ #if defined (__GNUC__) && ! defined (__cplusplus)
+ typedef unsigned long long t1;typedef t1*t2;
+-void g(){}
++void g(int,t1 const*,t1,t2,t1 const*,int){}
+ void h(){}
+ static __inline__ t1 e(t2 rp,t2 up,int n,t1 v0)
+ {t1 c,x,r;int i;if(v0){c=1;for(i=1;i<n;i++){x=up[i];r=x+1;rp[i]=r;}}return c;}
+
+--- GMP/configure	2025-05-14 19:33:35.730593315 -0400
++++ GMP/configure	2025-05-14 19:35:37.805619186 -0400
+@@ -6526,7 +6526,7 @@
+
+ #if defined (__GNUC__) && ! defined (__cplusplus)
+ typedef unsigned long long t1;typedef t1*t2;
+-void g(){}
++void g(int,t1 const*,t1,t2,t1 const*,int){}
+ void h(){}
+ static __inline__ t1 e(t2 rp,t2 up,int n,t1 v0)
+ {t1 c,x,r;int i;if(v0){c=1;for(i=1;i<n;i++){x=up[i];r=x+1;rp[i]=r;}}return c;}
+@@ -8145,7 +8145,7 @@
+
+ #if defined (__GNUC__) && ! defined (__cplusplus)
+ typedef unsigned long long t1;typedef t1*t2;
+-void g(){}
++void g(int,t1 const*,t1,t2,t1 const*,int){}
+ void h(){}
+ static __inline__ t1 e(t2 rp,t2 up,int n,t1 v0)
+ {t1 c,x,r;int i;if(v0){c=1;for(i=1;i<n;i++){x=up[i];r=x+1;rp[i]=r;}}return c;}

deps/GMP/GMP.cmake

@@ -1,9 +1,13 @@
 
 set(_srcdir ${CMAKE_CURRENT_LIST_DIR}/gmp)
 
+if (IN_GIT_REPO)
+    set(GMP_DIRECTORY_FLAG --directory ${BINARY_DIR_REL}/dep_GMP-prefix/src/dep_GMP)
+endif ()
+
 if (MSVC)
-    set(_output  ${DESTDIR}/include/gmp.h 
+    set(_output  ${DESTDIR}/include/gmp.h
-                 ${DESTDIR}/lib/libgmp-10.lib 
+                 ${DESTDIR}/lib/libgmp-10.lib
                  ${DESTDIR}/bin/libgmp-10.dll)
 
     add_custom_command(
@@ -12,7 +16,7 @@ if (MSVC)
         COMMAND ${CMAKE_COMMAND} -E copy ${_srcdir}/lib/win${DEPS_BITS}/libgmp-10.lib ${DESTDIR}/lib/
         COMMAND ${CMAKE_COMMAND} -E copy ${_srcdir}/lib/win${DEPS_BITS}/libgmp-10.dll ${DESTDIR}/bin/
     )
-    
+
     add_custom_target(dep_GMP SOURCES ${_output})
 
 else ()
@@ -59,7 +63,8 @@ else ()
         URL https://github.com/SoftFever/OrcaSlicer_deps/releases/download/gmp-6.2.1/gmp-6.2.1.tar.bz2
         URL_HASH SHA256=eae9326beb4158c386e39a356818031bd28f3124cf915f8c5b1dc4c7a36b4d7c
         DOWNLOAD_DIR ${DEP_DOWNLOAD_DIR}/GMP
-        BUILD_IN_SOURCE ON 
+        PATCH_COMMAND git apply ${GMP_DIRECTORY_FLAG} --verbose ${CMAKE_CURRENT_LIST_DIR}/0001-GMP_GCC15.patch
+        BUILD_IN_SOURCE ON
         CONFIGURE_COMMAND  env "CFLAGS=${_gmp_ccflags}" "CXXFLAGS=${_gmp_ccflags}" ./configure ${_cross_compile_arg} --enable-shared=no --enable-cxx=yes --enable-static=yes "--prefix=${DESTDIR}" ${_gmp_build_tgt}
         BUILD_COMMAND     make -j
         INSTALL_COMMAND   make install

src/mcut/source/math.cpp

@@ -24,6 +24,7 @@
 #include <algorithm> // std::sort
 #include <cstdlib>
 #include <tuple> // std::make_tuple std::get<>
+#include <cstdint>
 
 
     double square_root(const double& number)
@@ -716,7 +717,7 @@
         vec2 pp; /*projected p */
 #if 0
     int k = 0;
-    
+
     for (int j = 0; j < 3; j++)
     { // for each component
         if (j != polygon_plane_normal_largest_component)
@@ -830,7 +831,7 @@
     }
 
     char compute_segment_intersection(
-        const vec2& a, const vec2& b, const vec2& c, 
+        const vec2& a, const vec2& b, const vec2& c,
         const vec2& d, vec2& p, double& s, double& t)
     {
         // double s, t; /* The two parameters of the parametric eqns. */