[cmake] Add preliminary support for MinGW (#176)

This patch adds preliminary support for MinGW.
Only building static libm is possible at this time.
This patch also adds build-only testing on Appveyor.

Configure.cmake

@@ -209,6 +209,10 @@ else()
   set(DFT_C_FLAGS "${FLAGS_WALL} ${FLAGS_FASTMATH}")
 endif()
 
+if(CYGWIN OR MINGW)
+  set(SLEEF_C_FLAGS "${SLEEF_C_FLAGS} -fno-asynchronous-unwind-tables")
+  set(DFT_C_FLAGS "${DFT_C_FLAGS} -fno-asynchronous-unwind-tables")
+endif()
 
 # FEATURE DETECTION
 
@@ -336,7 +340,7 @@ CHECK_C_SOURCE_COMPILES("
     return g(2);
   }"
   COMPILER_SUPPORTS_WEAK_ALIASES)
-if (COMPILER_SUPPORTS_WEAK_ALIASES AND NOT CMAKE_SYSTEM_PROCESSOR MATCHES "arm")
+if (COMPILER_SUPPORTS_WEAK_ALIASES AND NOT CMAKE_SYSTEM_PROCESSOR MATCHES "arm" AND NOT MINGW)
   set(ENABLE_GNUABI ${COMPILER_SUPPORTS_WEAK_ALIASES})
 endif()
 
@@ -369,12 +373,6 @@ if(SLEEF_SHOW_ERROR_LOG)
   endif()
 endif(SLEEF_SHOW_ERROR_LOG)
 
-# Compiling AVX512F code on Cygwin does not succeed
-
-if (CMAKE_SYSTEM_NAME MATCHES "CYGWIN")
-  set(COMPILER_SUPPORTS_AVX512F FALSE)
-endif()
-
 # Detect if cmake is running on Travis
 string(COMPARE NOTEQUAL "" "$ENV{TRAVIS}" RUNNING_ON_TRAVIS)
 

appveyor.yml

@@ -12,6 +12,8 @@ install:
   - if "%DO_TEST%" == "TRUE" set ORGPATH="%PATH%"
   - if "%DO_TEST%" == "TRUE" "C:\\Cygwin64\\setup-x86_64.exe" -q -g -P libmpfr-devel,libgmp-devel,cmake
   - if "%DO_TEST%" == "TRUE" PATH c:\Cygwin64\bin;c:\Cygwin64\usr\bin;c:\projects\sleef\build-cygwin\bin;"%PATH%"
+  - if "%DO_TEST%" == "TRUE" "C:\\Cygwin64\\bin\\bash" -c 'mkdir build-mingw;cd build-mingw;CC=x86_64-w64-mingw32-gcc cmake -g\"Unix Makefiles\" .. -DBUILD_SHARED_LIBS=FALSE;make -j 2'
+  - if "%DO_TEST%" == "TRUE" cd "c:\\projects\\sleef"
   - if "%DO_TEST%" == "TRUE" "C:\\Cygwin64\\bin\\bash" -c 'mkdir build-cygwin;cd build-cygwin;cmake -g\"Unix Makefiles\" ..;make -j 2'
   - if "%DO_TEST%" == "TRUE" del /Q /F c:\projects\sleef\build-cygwin\bin\iut*
   - if "%DO_TEST%" == "TRUE" PATH "%ORGPATH%";c:\Cygwin64\bin;c:\Cygwin64\usr\bin;c:\projects\sleef\build-cygwin\bin;c:\projects\sleef\build\bin

src/CMakeLists.txt

@@ -4,5 +4,8 @@ include_directories("arch")
 add_subdirectory("libm")
 add_subdirectory("libm-tester")
 add_subdirectory("common")
-add_subdirectory("dft")
-add_subdirectory("dft-tester")
+
+if (NOT MINGW)
+  add_subdirectory("dft")
+  add_subdirectory("dft-tester")
+endif()

src/common/arraymap.c

@@ -13,7 +13,7 @@
 
 //
 
-#ifndef _MSC_VER
+#if !(defined(__MINGW32__) || defined(__MINGW64__) || defined(_MSC_VER))
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/file.h>

src/common/misc.h

@@ -263,7 +263,7 @@ static INLINE CONST int isnanl(long double x) { return x != x; }
 
 #endif // defined(_MSC_VER)
 
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(__MINGW32__) || defined(__MINGW64__)
 static INLINE CONST int isinff(float x) { return x == SLEEF_INFINITYf || x == -SLEEF_INFINITYf; }
 static INLINE CONST int isinfl(long double x) { return x == SLEEF_INFINITYl || x == -SLEEF_INFINITYl; }
 static INLINE CONST int isnanf(float x) { return x != x; }

src/libm-tester/CMakeLists.txt

@@ -68,7 +68,7 @@ macro(test_extension SIMD)
     add_test_iut(${TARGET_IUT${SIMD}})
     list(APPEND IUT_LIST ${TARGET_IUT${SIMD}})
 
-    if(LIB_MPFR AND NOT ${SIMD} STREQUAL NEON32)
+    if(LIB_MPFR AND NOT ${SIMD} STREQUAL NEON32 AND NOT MINGW)
       # Build tester2 SIMD
       string(TOLOWER ${SIMD} SCSIMD)
       foreach(P dp sp)
@@ -154,7 +154,7 @@ if (SLEEF_ARCH_X86)
   list(APPEND IUT_LIST iutdsp256)
 endif(SLEEF_ARCH_X86)
 
-if(LIB_MPFR)
+if(LIB_MPFR AND NOT MINGW)
   # Build tester2 scalar
   foreach(P dp sp)
     set(T "tester2${P}")
@@ -183,9 +183,7 @@ if(LIB_MPFR)
       target_include_directories(${TARGET_TESTER} PRIVATE ${MPFR_INCLUDE_DIR})
     endif()
   endif()
-endif(LIB_MPFR)
-
-# Set C standard requirement (-std=gnu99 for gcc)
+endif(LIB_MPFR AND NOT MINGW)
 
 # Tests depends on the library
 add_dependencies(${TARGET_IUT} ${TARGET_HEADERS})

src/libm-tester/testerutil.c

@@ -20,6 +20,10 @@
 #include <signal.h>
 #endif
 
+#if defined(__MINGW32__) || defined(__MINGW64__)
+#include <unistd.h>
+#endif
+
 #include "misc.h"
 
 #define DENORMAL_DBL_MIN (4.9406564584124654418e-324)