initial version of SQIsign

Co-authored-by: Jorge Chavez-Saab <jorgechavezsaab@gmail.com>
Co-authored-by: Maria Corte-Real Santos <36373796+mariascrs@users.noreply.github.com>
Co-authored-by: Luca De Feo <github@defeo.lu>
Co-authored-by: Jonathan Komada Eriksen <jonathan.eriksen97@gmail.com>
Co-authored-by: Basil Hess <bhe@zurich.ibm.com>
Co-authored-by: Antonin Leroux <18654258+tonioecto@users.noreply.github.com>
Co-authored-by: Patrick Longa <plonga@microsoft.com>
Co-authored-by: Lorenz Panny <lorenz@yx7.cc>
Co-authored-by: Francisco Rodríguez-Henríquez <francisco.rodriguez@tii.ae>
Co-authored-by: Sina Schaeffler <108983332+syndrakon@users.noreply.github.com>
Co-authored-by: Benjamin Wesolowski <19474926+Calodeon@users.noreply.github.com>

.cmake/target.cmake

@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: Apache-2.0
+
+if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64" OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm64")
+    add_definitions(-DTARGET_ARM64)
+    add_definitions(-DRADIX_64)
+elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm")
+    add_definitions(-DTARGET_ARM)
+    add_definitions(-DRADIX_32)
+elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86_64")
+    add_definitions(-DTARGET_AMD64)
+    add_definitions(-DRADIX_64)
+elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "i386" OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "i686")
+    add_definitions(-DTARGET_X86)
+    add_definitions(-DRADIX_32)
+elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "^(s390x.*|S390X.*)")
+    add_definitions(-DTARGET_S390X)
+    add_definitions(-DTARGET_BIG_ENDIAN)
+    add_definitions(-DRADIX_64)
+else()
+    add_definitions(-DTARGET_OTHER)
+    add_definitions(-DRADIX_64)
+    message("Warning: system architecture not detected, defaulting to 64 bit")
+endif()
+
+if (UNIX)
+    add_definitions(-DTARGET_OS_UNIX)
+else()
+    add_definitions(-DTARGET_OS_OTHER)
+endif()
+
+set(C_OPT_FLAGS "")
+
+if ((NOT DEFINED SQISIGN_BUILD_TYPE))
+  set(SQISIGN_BUILD_TYPE opt)
+endif()
+
+if ((NOT DEFINED SQISIGN_TEST_REPS))
+  set(SQISIGN_TEST_REPS 1000)
+endif()