From d81b125debd1e88ff7701fc4a1748dbca244cf7e Mon Sep 17 00:00:00 2001
From: TsXor <zhang050525@outlook.com>
Date: Mon, 2 Sep 2024 16:33:29 +0800
Subject: [PATCH] let msvc produce something

---
 CMakeLists.txt | 50 ++++++++++++++++++++++++++++++++++----------------
 allocfail.c    |  1 -
 fileline.c     |  4 ++++
 posix.c        |  4 ++++
 read.c         |  6 ++++++
 5 files changed, 48 insertions(+), 17 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c89f98e..183996f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,6 +56,9 @@ foreach(AUTODEF ${AUTODEFS})
     list(APPEND CMAKE_REQUIRED_DEFINITIONS -D${AUTODEF}=1)
 endforeach()
 
+# let MSVC shut up safety nonsense
+set(_CRT_SECURE_NO_WARNINGS 1)
+append_bool_def(BACKTRACE_DEFINITIONS _CRT_SECURE_NO_WARNINGS)
 
 # check for libraries
 check_library_exists("z" "compress" "" HAVE_ZLIB)
@@ -86,10 +89,18 @@ check_compiler_flag(C "-funwind-tables" HAVE_F_UNWIND_TABLES)
 check_compiler_flag(C "-frandom-seed=${RANDOM_SEED_STRING}" HAVE_F_RANDOM_SEED)
 check_compiler_flag(C "-pthread" HAVE_PTHREAD)
 check_compiler_flag(C "-gdwarf-5" HAVE_DWARF5)
-check_linker_flag(C "-Wl,--build-id" HAVE_BUILDID)
-check_linker_flag(C "-Wl,--compress-debug-sections=zlib-gnu" HAVE_COMPRESSED_DEBUG_ZLIB_GNU)
-check_linker_flag(C "-Wl,--compress-debug-sections=zlib-gabi" HAVE_COMPRESSED_DEBUG_ZLIB_GABI)
-check_linker_flag(C "-Wl,--compress-debug-sections=zst" HAVE_COMPRESSED_DEBUG_ZSTD)
+if (MSVC)
+    # somehow linker check will always pass, skip that for MSVC
+    set(HAVE_BUILDID 0)
+    set(HAVE_COMPRESSED_DEBUG_ZLIB_GNU 0)
+    set(HAVE_COMPRESSED_DEBUG_ZLIB_GABI 0)
+    set(HAVE_COMPRESSED_DEBUG_ZSTD 0)
+else()
+    check_linker_flag(C "-Wl,--build-id" HAVE_BUILDID)
+    check_linker_flag(C "-Wl,--compress-debug-sections=zlib-gnu" HAVE_COMPRESSED_DEBUG_ZLIB_GNU)
+    check_linker_flag(C "-Wl,--compress-debug-sections=zlib-gabi" HAVE_COMPRESSED_DEBUG_ZLIB_GABI)
+    check_linker_flag(C "-Wl,--compress-debug-sections=zst" HAVE_COMPRESSED_DEBUG_ZSTD)
+endif()
 
 
 # check for headers and functions
@@ -196,16 +207,18 @@ if (NOT HAVE_CLOCK_GETTIME)
 endif()
 
 
-# set warning flags
-list(APPEND WARNING_FLAGS
-    -W -Wall -Wwrite-strings -Wstrict-prototypes
-    -Wmissing-prototypes -Wold-style-definition
-    -Wmissing-format-attribute -Wcast-qual
-    -Wno-attributes -Wno-unknown-attributes
-    -Wpointer-arith
-)
-if (NOT DISABLE_WERROR)
-    list(APPEND WARNING_FLAGS -Werror)
+if (NOT MSVC)
+    # set warning flags
+    list(APPEND WARNING_FLAGS
+        -W -Wall -Wwrite-strings -Wstrict-prototypes
+        -Wmissing-prototypes -Wold-style-definition
+        -Wmissing-format-attribute -Wcast-qual
+        -Wno-attributes -Wno-unknown-attributes
+        -Wpointer-arith
+    )
+    if (NOT DISABLE_WERROR)
+        list(APPEND WARNING_FLAGS -Werror)
+    endif()
 endif()
 
 # common source files
@@ -354,7 +367,12 @@ endfunction()
 function(add_backtrace_part_with_pic TARGET_NAME)
     list(SUBLIST ARGV 1 -1 OPTARGS)
     add_backtrace_part(${TARGET_NAME} ${OPTARGS})
-    add_backtrace_part(${TARGET_NAME}_pic ${OPTARGS} FLAGS -fPIC)
+    if (MSVC)
+        # MSVC have no PIC option and Windows DLL doesn't need to be PIC 
+        add_library(${TARGET_NAME}_pic ALIAS ${TARGET_NAME})
+    else()
+        add_backtrace_part(${TARGET_NAME}_pic ${OPTARGS} FLAGS -fPIC)
+    endif()
 endfunction()
 
 add_backtrace_part_with_pic(common SRCS ${BACKTRACE_FILES})
@@ -424,7 +442,7 @@ install(
 
 
 # tests here ...
-if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME AND BUILD_TESTING)
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME AND BUILD_TESTING AND BACKTRACE_SUPPORTED)
     function(add_backtrace_test TARGET_NAME)
         cmake_parse_arguments(PARSE_ARGV 1 TEST
             "WRAPPED;DSYM" "CWD" "SRCS;DEFS;PARTS;LINKS;COMMAND;FLAGS;LDFLAGS;DEPFILE")
diff --git a/allocfail.c b/allocfail.c
index fb92821..46c1dc8 100644
--- a/allocfail.c
+++ b/allocfail.c
@@ -33,7 +33,6 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 
 #include "filenames.h"
 
diff --git a/fileline.c b/fileline.c
index 68e80c6..7c0938c 100644
--- a/fileline.c
+++ b/fileline.c
@@ -37,7 +37,11 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>
+#ifdef _MSC_VER
+#include <process.h>
+#else
 #include <unistd.h>
+#endif
 
 #if defined (HAVE_KERN_PROC_ARGS) || defined (HAVE_KERN_PROC)
 #include <sys/sysctl.h>
diff --git a/posix.c b/posix.c
index 79f4950..545a3be 100644
--- a/posix.c
+++ b/posix.c
@@ -36,7 +36,11 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#ifdef _MSC_VER
+#include <io.h>
+#else
 #include <unistd.h>
+#endif
 
 #include "backtrace.h"
 #include "internal.h"
diff --git a/read.c b/read.c
index 7af6660..82bf043 100644
--- a/read.c
+++ b/read.c
@@ -35,7 +35,13 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #include <errno.h>
 #include <stdlib.h>
 #include <sys/types.h>
+#ifdef _MSC_VER
+#include <io.h>
+#include <basetsd.h>
+typedef SSIZE_T ssize_t;
+#else
 #include <unistd.h>
+#endif
 
 #include "backtrace.h"
 #include "internal.h"